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  • Single Carbon Nanotubes as Ultrasmall All-Optical Memories
    ACS Photonics (IF 6.756) Pub Date : 2017-11-17
    Takushi Uda, Akihiro Ishii, Yuichiro K. Kato
    更新日期:2017-11-19
  • Coupled optical modelling for optimization of organic light-emitting diodes with external outcoupling structures
    ACS Photonics (IF 6.756) Pub Date : 2017-11-17
    Milan Kovačič, Paul-Anton Will, Benjamin Lipovsek, Marko Topič, Simone Lenk, Sebastian Reineke, Janez Krč

    We present an optical optimization on a red bottom-emitting OLED with an enhanced cavity in combination with external outcoupling textures – periodically positive and negative hexagonal dome shaped structures. A coupled optical modelling, combining simulations of coherent planar and incoherent structured layers, is verified and employed for optimization of the OLED structure and applied textures. Special attention is paid on the study of optical effects, related to the limited device area. Using optical modelling, we present and quantify main optical losses in the device. We show the importance of considering external outcoupling structures in optimization of thicknesses of organic films, which define the optical cavity. When optimized, an OLED with 50.5% light extraction efficiency (39.4% external quantum efficiency) and improved angular intensity distribution is predicted for devices with positive shaped dome structures. This approach allows for global efficiency optimization of complete OLEDs, comprising arbitrarily shaped outcoupling structures.

    更新日期:2017-11-19
  • The role of stoichiometry in the growth of large Pb2P2Se6 crystals for nuclear radiation detection
    ACS Photonics (IF 6.756) Pub Date : 2017-11-17
    Yadong Xu, Xu Fu, Hongjian Zheng, Yihui He, Wenwen Lin, Kyle M McCall, Zhifu Liu, Sanjib Das, Bruce W. Wessels, Mercouri G. Kanatzidis

    Pb2P2Se6 as a heavy element, chemically robust semiconductor, has been identified as a promising material for cost-effective room temperature X/γ-ray detection. Here, we report the properties of Pb2P2Se6 crystals grown by a vertical Bridgman method under off-stoichiometric Se-rich and Pb-rich conditions. Regardless of the conditions the resulting single crystals exhibited high bulk resistivity on the order of 1011 Ω·cm. However, the photoconductivity and charge transport properties varied based on growth condition indicating the different dominant defects associated with the type of stoichiometric deviation. The formation and nature of intrinsic defects in Pb2P2Se6 crystals were also studied by first-principles density functional theory (DFT) calculations as well as thermally stimulated current (TSC) spectroscopy. The TSC results indicated that four traps were common to both Se-rich and Pb-rich Pb2P2Se6, while a higher density of shallow defects were observed in Se-rich Pb2P2Se6. DFT calculations predict that the anti-site defects PPb+, PSe- and PbP- are the dominant deep donors and acceptors in Se-rich and Pb-rich Pb2P2Se6, respectively, which leads to the degradation of mobility lifetime product (μτ) on the order of 10-5 cm2·V-1 as measured under 241Am (5.48 MeV) alpha particles irradiation. Nevertheless, Pb2P2Se6 detectors with a thickness of 2 mm show reliable linear response under a series of radiation sources, including 241Am and 57Co γ-ray sources. A high X-ray sensitivity comparable to that of amorphous Se for Pb-rich Pb2P2Se6 detectors was realized, with the value of 68.3 μC·Gyair-1cm-2 under 40 kVp Ag X-rays at an electrical field of 50 V·cm-1.

    更新日期:2017-11-19
  • Highly efficient energy transfer in light emissive poly(9,9-dioctylfluorene) and poly(p-phenylene vinylene) blend system
    ACS Photonics (IF 6.756) Pub Date : 2017-11-17
    MUHAMMAD UMAIR HASSAN, Yee-Chen Liu, Kamran ul Hasan, Mohsin Rafique, Ali K. Yetisen, Haider Butt, Richard H. Friend

    A polymer blend system F81-xSYx based on poly(9,9-dioctylfluorene) (F8) from the family of polyfluorenes (PFO) and a poly(para-phenylenevinylene) (PPV) derivative super-yellow (SY) shows highly efficient energy transfer from F8 host to SY guest molecules. This has been realized due to a strong overlap between F8 photoemission and SY photoabsorption spectra, and negligibly low self-absorption. The steady-state and time-correlated spectroscopic measurements show an increased photoluminescence quantum efficiency (PLQE) and lifetime (τ) of SY, with an opposite trend of decreasing PLQE and τ of F8 excitons with increasing SY concentration, suggesting the Fӧrster resonance energy transfer (FRET) to be the main decay pathway in the proposed system. The systematic study of the exciton dynamics shows a complete energy transfer at 10% of SY in the F8 host matrix and a Fӧrster radius of ~ 6.3 nm. The polymer blend system exhibits low laser and amplified spontaneous emission thresholds. An ultrahigh efficiency (27 cd.A-1) in F81-xSYx based light emitting diodes (LED) has been realized due to the intrinsic property of a well-balanced charge transport within the emissive layer. The dual pathway, that is, the efficient energy transfer between the blended molecules via resonance energy transfer, and the charge-traps-assisted balanced transport makes the system promising for achieving highly efficient devices and a potential candidate for lasing applications.

    更新日期:2017-11-19
  • CMOS-compatible WS2-based all-optical modulator
    ACS Photonics (IF 6.756) Pub Date : 2017-11-17
    Shuo Yang, De Chao Liu, Ze Lin Tan, Ken Liu, Zhi Hong Zhu, Shiqiao Qin

    Two-dimensional materials are compatible with silicon complementary metal-oxide semiconductor processes. As such, the integration of two-dimensional materials with silicon-based semiconductors could lead to an amalgamation of the beneficial properties of both silicon and the two-dimensional material thereby facilitating improved performance. Single-layer transition metal dichalcogenide materials like MoS2, MoTe2 and WS2 are characterized by direct band gaps and possess high emission efficiencies. These materials are, therefore, perfectly suited for ameliorating the optical emission inadequacies of silicon-based-materials. In this study, we integrate WS2 with a silicon-based silicon-nitride waveguide to modulate a 532-nm pump light source, and successfully modulate and amplify an optical signal at 640 nm. Compared to other modulators based on two-dimensional materials, e.g., graphene, the proposed WS2-based modulator theoretically incurs lower losses and exhibits higher contrast levels and signal-to-noise ratios. As the proposed modulator can compensate for losses and has potential for on-chip integration, it has excellent prospects for application in the field of on-chip optical interconnects.

    更新日期:2017-11-19
  • Hot electron harvesting via photoelectric ejection and photothermal heat relaxation in hotspots-enriched plasmonic/photonic disordered nano-composites
    ACS Photonics (IF 6.756) Pub Date : 2017-11-16
    Long Wen, Yifu Chen, Li Liang, Qin Chen

    The ability of plasmonic nanostructures to harvest photons beyond the traditional band-to-band photovoltaic conversion of semiconductors has stimulated intensive research activities in hot electron. As an emerging strategy for energy-harvesting, photodetection and photocatalysis, realization of broadband and efficient plasmonic absorption with easily constructed metal-semconductor (M-S) nanosystems is essential for improving its photoelectric efficiency, whilst minimizing the cost and complexity of fabrication. Here, we report an approach for near-infrared (NIR) photodetection by combining the randomly and densely packed photonic nanostructures with ultrathin plasmonic coatings. Relying on the Au covered disordered silicon nanoholes (SiNHs) M-S platform, the efficient plasmonic absorption, strong field localization and together with random nature facilitate the broadband photon-energy conversion from both photoelectric hot electron ejection and photothermal hot electron relaxation. Spectral- and time resolved studies reveal that the proposed Au-SiNHs device is capable of tracking fast-varying NIR signals via hot electron emission process, with a photoresponsivity around 1.5-13 mA/W at wavelengths ranging from 1100 to 1500 nm. With a detailed theoretical analysis based on phenomenological model, different loss mechanisms involving in the hot electron related photoelectric process were described quantitatively and a large improvement potential was identified in the proposed hot electron harvesting platform. In addition, we demonstrated that the closely distributed random voids and tips in the Au-SiNHs structures enable the formation of substantial amount of hot-spots which can significantly elevate the local temperature through the relaxation of the non-ejected hot electrons, and therefore generate the obvious photothemal mediated photoresponse under voltage driven conditions.

    更新日期:2017-11-17
  • Inverse Design and Demonstration of a Compact on-Chip Narrowband Three-Channel Wavelength Demultiplexer
    ACS Photonics (IF 6.756) Pub Date : 2017-11-16
    Logan Su, Alexander Y. Piggott, Neil V. Sapra, Jan Petykiewicz, Jelena Vučković
    更新日期:2017-11-16
  • Super-Resolution Trapping: A Nanoparticle Manipulation Using Nonlinear Optical Response
    ACS Photonics (IF 6.756) Pub Date : 2017-11-15
    Masayuki Hoshina, Nobuhiko Yokoshi, Hiromi Okamoto, Hajime Ishihara
    更新日期:2017-11-16
  • Reconfigurable Metasurface Cloak for Dynamical Electromagnetic Illusions
    ACS Photonics (IF 6.756) Pub Date : 2017-11-15
    Cheng Huang, Jianing Yang, Xiaoyu Wu, Jiakun Song, Mingbo Pu, Changtao Wang, Xiangang Luo
    更新日期:2017-11-16
  • Nanoparticle-assisted STED nanoscopy with gold nanospheres
    ACS Photonics (IF 6.756) Pub Date : 2017-11-15
    Nicolai T. Urban, Matthew Foreman, Stefan W. Hell, Yonatan Sivan

    We demonstrate stimulated emission depletion (STED) microscopy with 20 nm gold nanospheres coated by fluorescently doped silica. We demonstrate significantly improved spatial resolution down to 75nm, which is the first time that hybrid NPs are used in STED imaging beyond the diffraction limit of confocal microscopy. Unlike previous demonstrations of super-resolution with metal nanoparticles with different techniques, this 3.3-fold resolution improvement was limited only by the particle size. The STED intensity required for this is almost twice lower than for conventional STED based on dye alone, and we observe no melting or displacement of the NPs at the utilized intensities. Moreover, we show that the nanoparticles can be imaged in an aqueous environment, demonstrating the relevance to bio-imaging. Finally, we also show, for the first time in this context, an up to 3-fold reduction in the rate of photobleaching compared to standard dye-based STED, thus enabling sustainably brighter images.

    更新日期:2017-11-16
  • Strongly coherent single photon emission from site-controlled InGaN quantum dots embedded in GaN nano-pyramids
    ACS Photonics (IF 6.756) Pub Date : 2017-11-15
    Jong-Hoi Cho, Youngmin M Kim, Seung-Hyuk Lim, Hwan-Seop Yeo, Sejeong Kim, Suhyun Gong, Yong-Hoon Cho

    Group III-nitride materials have drawn a great deal of renewed interest due to their versatile characteristics as quantum emitters including room temperature operation, widely-tunable wavelengths from ultraviolet to infrared and a high degree of linear polarization. However, most reported results for III-nitride based quantum emitters show large inhomogeneous linewidth broadening in comparison to their lifetime-limited values, which is detrimental to achieving indistinguishability with high visibility. To overcome this, we propose an unprecedented InGaN quantum dots formation technique at the apex of GaN nano-pyramid structures, which significantly suppressing inhomogeneous linewidth broadening. Using high-resolution transmission electron spectroscopy with three-dimensional schematic modeling, a site-controlled InGaN quantum dot with small height (< 2 nm) was estimated. No measurable screening effect or frequency jitter of the single photon emission were observed, which leads to the narrow homogeneous emission linewidth (64 ± 8 μeV) beyond the spectral resolution limit via Fourier-transform spectroscopy. The emitted photons exhibited superb antibunching characteristics with a near-unity degree of linear polarization, which is highly relevant for polarized non-classical light sources at elevated temperatures for applications in quantum information processing.

    更新日期:2017-11-16
  • Large-Aperture and Grain-Boundary Engineering through Template-Assisted Metal Dewetting for Resonances in the Short Wave Infrared
    ACS Photonics (IF 6.756) Pub Date : 2017-11-15
    Jonathan Trisno, Liangxing Lu, Zhaogang Dong, Jin Fa Ho, Yong Wei Zhang, Joel K. W. Yang
    更新日期:2017-11-15
  • Propagating Plasmons in a Charge-Neutral Quantum Tunneling Transistor
    ACS Photonics (IF 6.756) Pub Date : 2017-11-14
    Achim Woessner, Abhishek Misra, Yang Cao, Iacopo Torre, Artem Mishchenko, Mark B. Lundeberg, Kenji Watanabe, Takashi Taniguchi, Marco Polini, Kostya S. Novoselov, Frank H. L. Koppens
    更新日期:2017-11-15
  • Sharply Focused Azimuthally Polarized Beams with Magnetic Dominance: Near-Field Characterization at Nanoscale by Photoinduced Force Microscopy
    ACS Photonics (IF 6.756) Pub Date : 2017-11-13
    Jinwei Zeng, Fei Huang, Caner Guclu, Mehdi Veysi, Mohammad Albooyeh, H. Kumar Wickramasinghe, Filippo Capolino
    更新日期:2017-11-14
  • Resonant Excitation of Quantum Emitters in Hexagonal Boron Nitride
    ACS Photonics (IF 6.756) Pub Date : 2017-11-13
    Toan Trong Tran, Mehran Kianinia, Minh Nguyen, Sejeong Kim, Zai-Quan Xu, Alexander Kubanek, Milos Toth, Igor Aharonovich
    更新日期:2017-11-14
  • Probing Plasmon-NV0 Coupling at the Nanometer Scale with Photons and Fast Electrons
    ACS Photonics (IF 6.756) Pub Date : 2017-11-13
    Hugo Lourenço-Martins, Mathieu Kociak, Sophie Meuret, François Treussart, Yih Hong Lee, Xing Yi Ling, Huan-Cheng Chang, Luiz Henrique Galvão Tizei
    更新日期:2017-11-14
  • Switchable Plasmonic–Dielectric Resonators with Metal–Insulator Transitions
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Nikita A. Butakov, Ilya Valmianski, Tomer Lewi, Christian Urban, Zhensong Ren, Alexander A. Mikhailovsky, Stephen D. Wilson, Ivan K. Schuller, Jon A. Schuller
    更新日期:2017-11-11
  • Tunable Multispectral Color Sensor with Plasmonic Reflector
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Vladislav Jovanov, Helmut Stiebig, Dietmar Knipp
    更新日期:2017-11-11
  • Light-Emitting Devices Based on Electrochemiluminescence: Comparison to Traditional Light-Emitting Electrochemical Cells
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Seok Hwan Kong, Jong Ik Lee, Seunghan Kim, Moon Sung Kang
    更新日期:2017-11-11
  • Room-Temperature Group-IV LED Based on Defect-Enhanced Ge Quantum Dots
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Patrick Rauter, Lukas Spindlberger, Friedrich Schäffler, Thomas Fromherz, Julia Freund, Moritz Brehm
    更新日期:2017-11-11
  • New Generation of Ultrasensitive Label-Free Optical Si Nanowire-Based Biosensors
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Alessia Irrera, Antonio Alessio Leonardi, Cinzia Di Franco, Maria Josè Lo Faro, Gerardo Palazzo, Cristiano D’Andrea, Kyriaki Manoli, Giorgia Franzò, Paolo Musumeci, Barbara Fazio, Luisa Torsi, Francesco Priolo
    更新日期:2017-11-11
  • Near-IR Imaging Based on Hot Carrier Generation in Nanometer-Scale Optical Coatings
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Lisa J. Krayer, Elizabeth M. Tennyson, Marina S. Leite, Jeremy N. Munday
    更新日期:2017-11-11
  • Multiline operation from a single plasmon-assisted laser
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    David Hernandez Pinilla, Pablo Molina, Carmen de las Heras, Jorge Bravo-Abad, Luisa E Bausa, Mariola O Ramirez

    The demonstration of plasmon-assisted lasing by associating optical gain media with plasmonic nanostructures has led to a new generation of nanophotonic devices with unprecedented performances. However, despite the variety of designs demonstrated so far, the operation of these systems is in most cases limited to a single output wavelength, and some reports on multiline emission refer to mixing single nanolasers with the subsequent limitation in compactness. Here, we show multiline operation from a single plasmon-assisted nonlinear solid-state laser on which a linear chain of Ag nanoparticles is deposited. The system provides lasing at 1.08 µm, which is self-converted to the visible range through different parametric frequency-mixing processes generated at metal-dielectric interfaces. Near infrared and simultaneously green and tunable blue radiation with a sub-wavelength confinement in the direction perpendicular to the nanoparticle chain, are obtained at room temperature in CW regime. The results demonstrate the possibility of multifunctional operation from a single plasmon-assisted laser, and offer new avenues for the development of highly integrable sources of coherent radiation.

    更新日期:2017-11-11
  • Inverse design and demonstration of a compact on-chip narrowband three-channel wavelength demultiplexer
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Logan Su, Alexander Piggott, Neil V Sapra, Jan Petykiewicz, Jelena Vuckovic

    In wavelength division multiplexing schemes, splitters must be used to combine and separate different wavelengths. Conventional splitters are fairly large with footprints in hundreds to thousands of square microns, and experimentally-demonstrated multimode-interference-based and inverse-designed ultra-compact splitters operate with only two channels and large channel spacing (>100 nm). Here we inverse design and experimentally demonstrate a three-channel wavelength demultiplexer with 40 nm spacing (1500 nm, 1540 nm, and 1580 nm) with a footprint of 24.75 μm2. The splitter has a simulated peak insertion loss of -1.55 dB with under -15 dB crosstalk and a measured peak insertion loss of -2.29 dB with under -10.7 dB crosstalk.

    更新日期:2017-11-11
  • Controlling Metamaterial Transparency with Superchiral Fields
    ACS Photonics (IF 6.756) Pub Date : 2017-11-10
    Christopher Kelly, Larousse Khosravi Khorashad, Nikolaj Gadegaard, Laurence D. Barron, Alexander O. Govorov, Affar Shahid Karimullah, Malcolm Kadodwala

    The advent of metamaterials has heralded a period of unprecedented control of light. The optical responses of metamaterials are determined by the properties of constituent nanostructures. The current design philosophy for tailoring metamaterial functionality is to use geometry to control the nearfield coupling of the elements of the nanostructures. A drawback of this geometry-focused strategy is that the functionality of a metamaterial is pre-determined and cannot be manipulated easily post-fabrication. Here we present a new design paradigm for metamaterials, in which the coupling between chiral elements of a nanostructure is controlled by the chiral asymmetries of the nearfield, which can be externally manipulated. We call this mechanism dichroic coupling. This phenomenon is used to control the electromagnetic induced transparency displayed by a chiral metamaterial by tuning the chirality of the near fields. This “non-geometric” paradigm for controlling optical properties offers the opportunity to optimally design chiral metamaterials for applications in polarization state control and for ultrasensitive analysis of biomaterials and soft matter.

    更新日期:2017-11-11
  • Exciton dynamics in colloidal quantum-dot LEDs under active device operations
    ACS Photonics (IF 6.756) Pub Date : 2017-11-08
    Sushant Shendre, Vijay Kumar Sharma, Cuong Dang, Hilmi Volkan Demir

    Colloidal quantum-dot light-emitting diodes (QLEDs) are lucrative options for color pure lighting sources. To achieve high-performance QLEDs, besides developing high-efficiency quantum dots (QDs), it is essential to understand their device physics. However, little understanding of the QD emission behavior in active QLEDs is one of the main factors hindering the improvement of device efficiency. In this work, we systematically studied the exciton dynamics of gradient composition CdSe@ZnS QDs during electroluminescence in a working QLED. With time-resolved photoluminescence (TRPL) analyses using fluorescence lifetime imaging microscopy (FLIM) we analysed a large population of QDs spatially spreading over an extended area inside and outside the device. This allows us to reveal the statistically significant changes in the behavior of QD emission in the device at different levels of applied voltages and injection currents. We find that the QD emission efficiency first drops in device fabrication with Al electrode deposition and that the QD exciton lifetime is then statistically reduced further under the QLED’s working conditions. This implies the non-radiative Auger recombination process is active in charged QDs as a result of imbalanced charge injection in a working QLED. Our results help to understand the exciton behavior during the operation of a QLED and demonstrate a new approach to explore the exciton dynamics statistically with a large QD population.

    更新日期:2017-11-09
  • High-speed, phase-dominant spatial light modulation with silicon-based active resonant antennas
    ACS Photonics (IF 6.756) Pub Date : 2017-11-08
    Yu Horie, Amir Arbabi, Ehsan Arbabi, Seyedeh Mahsa Kamali, Andrei Faraon

    Spatiotemporal control of optical wavefronts is of great importance in numerous free-space optical applications including imaging in 3D and through scattering media, remote sensing, and generation of various beam profiles for microscopy. Progress in these applications is currently limited due to lack of compact and high-speed spatial light modulators. Here we report an ac- tive antenna comprising a free-space coupled asymmetric Fabry–Perot resonator, that produces a phase-dominant thermo-optic modulation of reflected light at frequencies approaching tens of kilohertz. As a proof of concept for spatial light modulation, we demonstrate a 6×6 array of such active antennas with beam deflection capability. The robust design of our silicon-based active antenna will enable large-scale integration of high-speed, phase-dominant spatial light modulators.

    更新日期:2017-11-09
  • Ultralight Angstrom-Scale Optimal Optical Reflectors
    ACS Photonics (IF 6.756) Pub Date : 2017-11-09
    Georgia T. Papadakis, Prineha Narang, Ravishankar Sundararaman, Nicholas Rivera, Hrvoje Buljan, Nader Engheta, Marin Soljačić
    更新日期:2017-11-09
  • Optical Properties and Reliability Studies of Gradient Alloyed Green Emitting (CdSe)x(ZnS)1–x and Red Emitting (CuInS2)x(ZnS)1–x Quantum Dots for White Light-Emitting Diodes
    ACS Photonics (IF 6.756) Pub Date : 2017-11-09
    Rachod Boonsin, Anthony Barros, Florian Donat, Damien Boyer, Geneviève Chadeyron, Raphaël Schneider, Philippe Boutinaud, Rachid Mahiou
    更新日期:2017-11-09
  • Deterministic Approach to Achieve Broadband Polarization-Independent Diffusive Scatterings Based on Metasurfaces
    ACS Photonics (IF 6.756) Pub Date : 2017-11-09
    He-Xiu Xu, Shaojie Ma, Xiaohui Ling, Xiao-Kuan Zhang, Shiwei Tang, Tong Cai, Shulin Sun, Qiong He, Lei Zhou
    更新日期:2017-11-09
  • Resonant excitation of quantum emitters in hexagonal boron nitride
    ACS Photonics (IF 6.756) Pub Date : 2017-11-07
    Toan Trong Tran, Mehran Kianinia, Minh Nguyen, Sejeong Kim, Zai-Quan Xu, Alexander Kubanek, Milos Toth, Igor Aharonovich

    Quantum emitters in layered hexagonal boron nitride (hBN) have recently attracted a great attention as promising single photon sources. In this work, we demonstrate resonant excitation of a single defect center in hBN, one of the most important prerequisites for employment of optical sources in quantum information application. We observe spectral linewidths of hBN emitter narrower than 1 GHz while the emitter experiences spectral diffusion. Temporal photoluminescence measurements reveals an average spectral diffusion time of around 100 ms. On-resonance photon antibunching measurement is also realized. Our results shed light on the potential use of quantum emitters from hBN in nanophotonics and quantum information.

    更新日期:2017-11-08
  • Plasmon-Exciton Coupling in Symmetry-Broken Nanocavities
    ACS Photonics (IF 6.756) Pub Date : 2017-11-08
    Rui-Qi Li, F. J. García-Vidal, A. I. Fernández-Domínguez
    更新日期:2017-11-08
  • Dispersion Anisotropy of Plasmon–Exciton–Polaritons in Lattices of Metallic Nanoparticles
    ACS Photonics (IF 6.756) Pub Date : 2017-11-08
    Mohammad Ramezani, Alexei Halpin, Johannes Feist, Niels Van Hoof, Antonio I. Fernández-Domínguez, Francisco J. Garcia-Vidal, Jaime Gómez Rivas
    更新日期:2017-11-08
  • Theory of Four-Wave-Mixing in Phonon Polaritons
    ACS Photonics (IF 6.756) Pub Date : 2017-11-08
    Christopher R. Gubbin, Simone De Liberato
    更新日期:2017-11-08
  • Colossal Terahertz Field Enhancement Using Split-Ring Resonators with a Sub-10 nm Gap
    ACS Photonics (IF 6.756) Pub Date : 2017-11-07
    Nayeon Kim, Sungjun In, Dukhyung Lee, Jiyeah Rhie, Jeeyoon Jeong, Dai-Sik Kim, Namkyoo Park
    更新日期:2017-11-08
  • Cs2AgInCl6 Double Perovskite Single Crystals: Parity Forbidden Transitions and Their Application For Sensitive and Fast UV Photodetectors
    ACS Photonics (IF 6.756) Pub Date : 2017-11-07
    Jiajun Luo, Shunran Li, Haodi Wu, Ying Zhou, Yang Li, Jing Liu, Jinghui Li, Kanghua Li, Fei Yi, Guangda Niu, Jiang Tang
    更新日期:2017-11-08
  • Ultrafast All-Optical Switching Incorporating in Situ Graphene Grown along an Optical Fiber by the Evanescent Field of a Laser
    ACS Photonics (IF 6.756) Pub Date : 2017-11-07
    Pulak C. Debnath, Siam Uddin, Yong-Won Song
    更新日期:2017-11-08
  • Demonstration of Orbital Angular Momentum Multiplexing and Demultiplexing Based on a Metasurface in the Terahertz Band
    ACS Photonics (IF 6.756) Pub Date : 2017-11-07
    Huan Zhao, Baogang Quan, Xinke Wang, Changzhi Gu, Junjie Li, Yan Zhang
    更新日期:2017-11-07
  • Near-IR imaging based on hot carrier generation in nanometer-scale optical coatings
    ACS Photonics (IF 6.756) Pub Date : 2017-11-07
    Lisa Krayer, Elizabeth M. Tennyson, Marina S. Leite, Jeremy N Munday

    Silicon is the most widely used material for visible photodetection, with extensive applications in both consumer and industrial products. Further, its excellent optoelectronic properties and natural abundance have made it nearly ideal for microelectronic devices and solar cells. However, its lack of absorption in the infrared precludes its use in infrared detectors and imaging sensors, severely constraining its implementation in telecommunications. Here we show that this limitation can be overcome by exploiting resonant absorption in ultrathin metal films (<20 nm). Through appropriate optical design, a zeroth-order Fabry-Perot resonance is achieved, enabling ~80% light absorption below the bandgap of the semiconductor. Absorption within the metal film results in excitation and injection of hot carriers through a Schottky junction into the Si. We experimentally demonstrate this phenomenon with four ultrathin planar metal films (Pt, Fe, Cr, and Ti), chosen to satisfy the resonant condition over a wide range of wavelengths (1200-1600 nm), and realize a near-infrared imaging detector. Our approach paves the way to implement a scalable, lithography-free, effective and low-cost route to obtain silicon-based optoelectronics beyond the material bandgap.

    更新日期:2017-11-07
  • Single carbon nanotubes as ultrasmall all-optical memories
    ACS Photonics (IF 6.756) Pub Date : 2017-11-07
    Takushi Uda, Akihiro Ishii, Yuichiro K. Kato

    Performance improvements are expected from integration of photonic devices into information processing systems, and in particular, all-optical memories provide a key functionality. Scaling down the size of memory elements is desirable for high-density integration, and the use of nanomaterials would allow for devices that are significantly smaller than the operation wavelengths. Here we report on all-optical memory based on individual carbon nanotubes, where adsorbed molecules give rise to optical bistability. By exciting at the high-energy tail of the excitonic absorption resonance, nanotubes can be switched between the desorbed state and the adsorbed state. We demonstrate reversible and reproducible operation of the nanotube optical memory, and determine the rewriting speed by measuring the molecular adsorption and desorption times. Our results underscore the impact of molecular-scale effects on optical properties of nanomaterials, offering new design strategies for photonic devices that are a few orders of magnitude smaller than the optical diffraction limit.

    更新日期:2017-11-07
  • All-Optical Switching of Two Continuous Waves in Few Layer Bismuthene Based on Spatial Cross-Phase Modulation
    ACS Photonics (IF 6.756) Pub Date : 2017-11-03
    Lu Lu, Wenhui Wang, Leiming Wu, Xiantao Jiang, Yuanjiang Xiang, Jianqing Li, Dianyuan Fan, Han Zhang
    更新日期:2017-11-05
  • Form-Birefringence in ITO Thin Films Engineered by Ultrafast Laser Nanostructuring
    ACS Photonics (IF 6.756) Pub Date : 2017-11-03
    Ausra Cerkauskaite, Rokas Drevinskas, Asi Solodar, Ibrahim Abdulhalim, Peter G. Kazansky
    更新日期:2017-11-05
  • Multifunctional Metamirror: Polarization Splitting and Focusing
    ACS Photonics (IF 6.756) Pub Date : 2017-11-03
    Sergejs Boroviks, Rucha A. Deshpande, N. Asger Mortensen, Sergey I. Bozhevolnyi
    更新日期:2017-11-05
  • Analyses of intravesicular exosomal proteins using a nano-plasmonic system
    ACS Photonics (IF 6.756) Pub Date : 2017-11-03
    Jongmin Park, Hyungsoon Im, Seonki Hong, Cesar M. Castro, Ralph Weissleder, Hakho Lee

    Extracellular vesicles (EVs), including exosomes, are nanoscale membrane particles shed from cells and contain cellular proteins whose makeup could inform cancer diagnosis and treatment. Most analyses have focused on surface proteins while analysis of intravesicular proteins has been more challenging. Herein, we report an EV screening assay for both intravesicular and transmembrane proteins using a nanoplasmonic sensor. Termed iNPS (intravesicular nanoplasmonic system), this platform used nanohole-based surface plasmon resonance (SPR) for molecular detection. Specifically, we i) established a unified assay protocol to detect intravesicular as well as transmembrane proteins; and ii) engineered plasmonic substrates to enhance detection sensitivity. The resulting iNPS enabled sensitive (0.5 µL sample per marker) and high-throughput (a 10 × 10 array) detection for EV proteins. When applied to monitor EVs from drug-treated cancer cells, the iNPS assay revealed drug-dependent unique EV protein signatures. We envision that iNPS could be a powerful tool for comprehensive molecular screening of EVs.

    更新日期:2017-11-05
  • Color-Tunable Carbon Dots Possessing Solid-State Emission for Full-Color Light-Emitting Diodes Applications
    ACS Photonics (IF 6.756) Pub Date : 2017-11-03
    Tanglue Feng, Qingsen Zeng, Siyu Lu, Xianju Yan, Junjun Liu, Songyuan Tao, Mingxi Yang, Bai Yang

    In this paper, a unique strategy is proposed to modulate fluorescence color of carbon dots (CDs) under both aqueous solution and solid state for bright multi-color light-emitting diodes (LEDs) applications. We report facile synthesis of dual-peak-emissive CDs with self-quenching-resistant character under solid state through hydrothermal method, and investigate the origins of dual-peak emission for the first time. In addition, based on the unique dual-peak-emissive phenomenon, acid-mediated PL behaviors were realized by changing the pH value of hydrothermal precursors. We realized the color-tunable fluorescence under aqueous solution from blue (B-CDs) to yellow-green (YG-CDs) color, and solid state from yellow to orange-red color. The changed PL behaviors are attributed to the more conjugated structure inside CDs due to elevated carbonization degree. Furthermore, the red-shifted fluorescence from aqueous solution to solid state is ascribed to supramolecular crosslinking between adjacent particles. Thus, by manipulating the supramolecular crosslinking degree of YG-CDs in PVA, series of luminescent blue-shift CDs/PVA composites phosphor were obtained. Finally, we fabricate the almost full-color and white color LEDs with decent performances, which indicate their potential for solid-state lighting applications.

    更新日期:2017-11-05
  • Colossal Terahertz Field Enhancement using Split-Ring Resonators with a Sub-10 nm Gap
    ACS Photonics (IF 6.756) Pub Date : 2017-11-02
    Nayeon Kim, Sungjun In, Dukhyung Lee, Jiyeah Rhie, Jeeyoon Jeong, Dai-Sik Kim, Namkyoo Park

    Terahertz (THz) nanogap structures have emerged as versatile platforms for THz science and applications by virtue of their strong in-gap field enhancements and accompanying high levels of sensitivity to gap environments. However, despite their potential, reliable fabrication methods by which to create THz structures with sub-10 nm gaps remain limited. In this work, we fabricated THz split-ring resonator (SRR) arrays featuring a sub-10 nm split gap. Our fabrication method, involving photolithography, argon ion milling, and atomic layer deposition, is a high-throughput technique which is also applicable to the fabrication of other THz structures with sub-10 nm gaps. Through THz-time domain spectroscopy and a numerical simulation, we identified the fundamental magnetic resonances of the nanogap SRRs, at which the electric field enhancement factor is experimentally estimated to be around 7000. This substantial field enhancement makes SRRs with a sub-10 nm gap suitable for the study of high-field phenomena and related applications.

    更新日期:2017-11-03
  • Near-Infrared Plasmonic Copper Nanocups Fabricated by Template-Assisted Magnetron Sputtering
    ACS Photonics (IF 6.756) Pub Date : 2017-11-03
    Yunxiang Qin, Xiang-Tian Kong, Zhiming Wang, Alexander O. Govorov, Uwe R. Kortshagen
    更新日期:2017-11-03
  • Surface Oxidation Doping to Enhance Photogenerated Carrier Separation Efficiency for Ultrahigh Gain Indium Selenide Photodetector
    ACS Photonics (IF 6.756) Pub Date : 2017-11-03
    Yih-Ren Chang, Po-Hsun Ho, Cheng-Yen Wen, Tzu-Pei Chen, Shao-Sian Li, Jhe-Yi Wang, Min-Ken Li, Che-An Tsai, Raman Sankar, Wei-Hua Wang, Po-Wen Chiu, Fang-Cheng Chou, Chun-Wei Chen
    更新日期:2017-11-03
  • Surface Plasmon Polariton Mediated Multiple Toroidal Resonances in 3D Folding Metamaterials
    ACS Photonics (IF 6.756) Pub Date : 2017-11-02
    Shengyan Yang, Zhe Liu, Ling Jin, Wuxia Li, Shuang Zhang, Junjie Li, Changzhi Gu
    更新日期:2017-11-03
  • Exact States and Spectra of Vibrationally Dressed Polaritons
    ACS Photonics (IF 6.756) Pub Date : 2017-11-02
    M. Ahsan Zeb, Peter G. Kirton, Jonathan Keeling
    更新日期:2017-11-03
  • Functional Meta-Optics and Nanophotonics Govern by Mie Resonances
    ACS Photonics (IF 6.756) Pub Date : 2017-11-02
    Sergey Kruk, Yuri Kivshar
    更新日期:2017-11-02
  • Suppressed Quenching and Strong-Coupling of Purcell-Enhanced Single-Molecule Emission in Plasmonic Nanocavities
    ACS Photonics (IF 6.756) Pub Date : 2017-11-01
    Nuttawut Kongsuwan, Angela Demetriadou, Rohit Chikkaraddy, Felix Benz, Vladimir A. Turek, Ulrich F. Keyser, Jeremy J. Baumberg, Ortwin Hess
    更新日期:2017-11-02
  • Theory of four-wave-mixing in phonon polaritons
    ACS Photonics (IF 6.756) Pub Date : 2017-11-01
    Christopher R. Gubbin, Simone De Liberato

    Third order anharmonic scattering in light-matter systems can drive a wide variety of practical and physically interesting processes from lasing to polariton condensation. Motivated by recent experimental results in the nonlinear optics of localised phonon polaritons, in this Letter we develop a quantum theory capable of describing four-wave mixing in arbitrarily inhomogeneous photonic environments. Using it we investigate Kerr self-interaction and parametric scattering of surface and localised phonon polaritons, showing both processes to be within experimental reach.

    更新日期:2017-11-02
  • A new generation of ultrasensitive label-free optical Si nanowire-based biosensors
    ACS Photonics (IF 6.756) Pub Date : 2017-11-01
    Alessia Irrera, Antonio Alessio Leonardi, Cinzia Di Franco, Maria José Lo Faro, Gerardo Palazzo, Cristiano D'Andrea, Kyriaki Manoli, Giorgia Franzo, Paolo Musumeci, barbara fazio, Luisa Torsi, Francesco Priolo

    We demonstrate the realization of the first label-free optical biosensor based on the room temperature luminescence of silicon nanowires (NWs) tested for the selective detection of C-reactive protein in human serum. High aspect ratio Si NW arrays used as sensing interface, are synthesized by a fast, low-cost and Si industrially compatible approach. Si NW optical biosensors are fast and offer a broad concentration dynamic range that can be tuned according to different applications. Moreover, the platform is endowed with a high selectivity towards the target analyte and a sensitivity down to the fM limit of detection, opening the route towards non-invasive analysis in bio-fluids such as saliva.

    更新日期:2017-11-02
  • InP/InAsP Nanowire-Based Spatially Separate Absorption and Multiplication Avalanche Photodetectors
    ACS Photonics (IF 6.756) Pub Date : 2017-11-01
    Vishal Jain, Magnus Heurlin, Enrique Barrigon, Lorenzo Bosco, Ali Nowzari, Shishir Shroff, Virginia Boix, Mohammad Karimi, Reza J. Jam, Alexander Berg, Lars Samuelson, Magnus T. Borgström, Federico Capasso, Håkan Pettersson
    更新日期:2017-11-01
  • Van der Waals Materials for Atomically-Thin Photovoltaics: Promise and Outlook
    ACS Photonics (IF 6.756) Pub Date : 2017-11-01
    Deep Jariwala, Artur R. Davoyan, Joeson Wong, Harry A. Atwater
    更新日期:2017-11-01
  • One-Directional Antenna Systems: Energy Transfer from Monomers to J-Aggregates within 1D Nanoporous Aluminophosphates
    ACS Photonics (IF 6.756) Pub Date : 2017-10-31
    Rebeca Sola-Llano, Yasuhiko Fujita, Luis Gómez-Hortigüela, Almudena Alfayate, Hiroshi Uji-i, Eduard Fron, Shuichi Toyouchi, Joaquín Pérez-Pariente, Iñigo López-Arbeloa, Virginia Martínez-Martínez
    更新日期:2017-11-01
  • Theory of Nanoscale Organic Cavities: The Essential Role of Vibration-Photon Dressed States
    ACS Photonics (IF 6.756) Pub Date : 2017-11-01
    Felipe Herrera, Frank C. Spano

    The interaction of organic molecules and molecular aggregates with electromagnetic fields that are strongly confined inside optical cavities within nanoscale volumes, has allowed the observation of exotic quantum regimes of light-matter interaction at room temperature, for a wide variety of cavity materials and geometries. Understanding the universal features of such organic cavities represents a significant challenge for theoretical modelling, as experiments show that these systems are characterized by an intricate competition between coherent and dissipative processes involving entangled nuclear, electronic and photonic degrees of freedom. In this review, we discuss a new theoretical framework that can successfully describe organic cavities under strong light-matter coupling. The theory combines standard concepts in chemical physics and quantum optics to provide a microscopic description of vibronic organic polaritons that is fully consistent with available experiments, and yet is profoundly different from the common view of organic polaritons. We show that by introducing a new class of vibronic polariton wave functions with a photonic component that is dressed by intramolecular vibrations, the new theory can offer a consistent solution to some of the long-standing puzzles in the interpretation of organic cavity photoluminescence. Throughout this review, we confront the predictions of the model with spectroscopic observations, and describe the conditions under which the theory reduces to previous approaches. We finally discuss possible extensions of the theory to account for realistic complexities of organic cavities such spatial inhomogeneities and the multi-mode nature of confined electromagnetic fields.

    更新日期:2017-11-01
  • Room-temperature group-IV LED based on defect-enhanced Ge quantum dots
    ACS Photonics (IF 6.756) Pub Date : 2017-11-01
    Patrick Rauter, Lukas Spindlberger, Friedrich Schaeffler, Thomas Fromherz, Julia Freund, Moritz Brehm

    As recently demonstrated, defect-enhanced Ge quantum dots (Ge-DEQDs) in a crystalline Si matrix can be employed as CMOS-compatible gain material in optically pumped lasers. Due to the stability of their optical properties up to temperatures beyond 300 K, the Ge-DEQD system is a highly promising candidate for the realization of an electrically pumped group-IV laser source for integration in a monolithic optoelectronic platform fit for room-temperature operation. We report on the realization of light-emitting diodes based on Ge-DEQDs operating at telecom wavelengths and above room temperature. The DEQD electroluminescence characteristics were studied spectrally resolved as a function of driving current and device temperature. The experimental results show that the excellent optical properties of Ge-DEQDs are maintained under electrical pumping at high current densities and at device temperatures of at least 100°C. Furthermore, the emission intensity scales with the number of quantum dot layers embedded into the p-i-n diode structures, thus indicating the scalability of the approach for large gain material volumes. The presented results form an essential step towards the future demonstration of a CMOS-compatible, electrically pumped room-temperature laser based on Ge-DEQDs.

    更新日期:2017-11-01
  • Large-Aperture and Grain-Boundary Engineering through Template Assisted Metal Dewetting (TeAMeD) for Resonances in the Short Wave Infrared
    ACS Photonics (IF 6.756) Pub Date : 2017-10-31
    Jonathan Trisno, Liang Xing Lu, Jinfa Ho, Zhaogang Dong, Yong-Wei Zhang, Joel K.W. K.W. Yang

    We extend the fabrication method of Template Assisted Metal Dewetting (TeAMeD) to create near-infrared resonant nanostructures in an Au film without the need for etching or lift-off. TeAMeD has previously been used to generate high aspect-ratio sub-10 nm apertures, but struggles to generate larger apertures (>100 nm). In this work, we introduce a method to create larger apertures using templates consisting of fin-like patterns with radial symmetry. We also report evidence of grain boundary engineering, through the template pinning effect. Our three-dimensional phase field model of TeAMeD predicts both the grain-boundary pinning and aperture opening effects that agree well with experiments. Combined with simulation design, TeAMeD can be established be as a grain engineering platform, allowing grain shape and boundary position to be controlled. Variations of template motif produces larger grains, and numerous possible outcomes, including suspended Au nanodisks and triangular apertures.

    更新日期:2017-10-31
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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