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  • Band-structure-engineered high-gain LWIR photodetector based on a type-II superlattice
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-14
    Arash Dehzangi; Jiakai Li; Manijeh Razeghi

    The LWIR and longer wavelength regions are of particular interest for new developments and new approaches to realizing long-wavelength infrared (LWIR) photodetectors with high detectivity and high responsivity. These photodetectors are highly desirable for applications such as infrared earth science and astronomy, remote sensing, optical communication, and thermal and medical imaging. Here, we report

  • Slow light bimodal interferometry in one-dimensional photonic crystal waveguides
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-14
    Luis Torrijos-Morán; Amadeu Griol; Jaime García-Rupérez

    Strongly influenced by the advances in the semiconductor industry, the miniaturization and integration of optical circuits into smaller devices has stimulated considerable research efforts in recent decades. Among other structures, integrated interferometers play a prominent role in the development of photonic devices for on-chip applications ranging from optical communication networks to point-of-care

  • Low-loss optical waveguides made with a high-loss material
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-12
    Darius Urbonas; Rainer F. Mahrt; Thilo Stöferle

    For guiding light on a chip, it has been pivotal to use materials and process flows that allow low absorption and scattering. Based on subwavelength gratings, here, we show that it is possible to create broadband, multimode waveguides with very low propagation losses despite using a strongly absorbing material. We perform rigorous coupled-wave analysis and finite-difference time-domain simulations

  • Ensemble learning of diffractive optical networks
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-11
    Md Sadman Sakib Rahman; Jingxi Li; Deniz Mengu; Yair Rivenson; Aydogan Ozcan

    A plethora of research advances have emerged in the fields of optics and photonics that benefit from harnessing the power of machine learning. Specifically, there has been a revival of interest in optical computing hardware due to its potential advantages for machine learning tasks in terms of parallelization, power efficiency and computation speed. Diffractive deep neural networks (D2NNs) form such

  • Broadband terahertz wave generation from an epsilon-near-zero material
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-07
    Wenhe Jia; Meng Liu; Yongchang Lu; Xi Feng; Qingwei Wang; Xueqian Zhang; Yibo Ni; Futai Hu; Mali Gong; Xinlong Xu; Yuanyuan Huang; Weili Zhang; Yuanmu Yang; Jiaguang Han

    Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and spectroscopy. Conventionally, THz pulses are generated by optical rectification in bulk nonlinear crystals with millimetre thickness, with the bandwidth limited by the phase-matching condition. Here we demonstrate broadband THz emission via surface optical rectification

  • Ultra-low-loss on-chip zero-index materials
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-07
    Tian Dong; Jiujiu Liang; Sarah Camayd-Muñoz; Yueyang Liu; Haoning Tang; Shota Kita; Peipei Chen; Xiaojun Wu; Weiguo Chu; Eric Mazur; Yang Li

    Light travels in a zero-index medium without accumulating a spatial phase, resulting in perfect spatial coherence. Such coherence brings several potential applications, including arbitrarily shaped waveguides, phase-mismatch-free nonlinear propagation, large-area single-mode lasers, and extended superradiance. A promising platform to achieve these applications is an integrated Dirac-cone material that

  • Direct quantification of topological protection in symmetry-protected photonic edge states at telecom wavelengths
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-06
    Sonakshi Arora; Thomas Bauer; René Barczyk; Ewold Verhagen; L. Kuipers

    Topological on-chip photonics based on tailored photonic crystals (PhCs) that emulate quantum valley-Hall effects has recently gained widespread interest owing to its promise of robust unidirectional transport of classical and quantum information. We present a direct quantitative evaluation of topological photonic edge eigenstates and their transport properties in the telecom wavelength range using

  • Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-06
    Sicong Wang; Chen Wei; Yuanhua Feng; Hongkun Cao; Wenzhe Li; Yaoyu Cao; Bai-Ou Guan; Arata Tsukamoto; Andrei Kirilyuk; Alexey V. Kimel; Xiangping Li

    Although photonics presents the fastest and most energy-efficient method of data transfer, magnetism still offers the cheapest and most natural way to store data. The ultrafast and energy-efficient optical control of magnetism is presently a missing technological link that prevents us from reaching the next evolution in information processing. The discovery of all-optical magnetization reversal in

  • Low-loss single-mode hybrid-lattice hollow-core photonic-crystal fibre
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-06
    Foued Amrani; Jonas H. Osório; Frédéric Delahaye; Fabio Giovanardi; Luca Vincetti; Benoît Debord; Frédéric Gérôme; Fetah Benabid

    Remarkable recent demonstrations of ultra-low-loss inhibited-coupling (IC) hollow-core photonic-crystal fibres (HCPCFs) established them as serious candidates for next-generation long-haul fibre optics systems. A hindrance to this prospect and also to short-haul applications such as micromachining, where stable and high-quality beam delivery is needed, is the difficulty in designing and fabricating

  • Toward optical coherence tomography on a chip: in vivo three-dimensional human retinal imaging using photonic integrated circuit-based arrayed waveguide gratings
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-05
    Elisabet A. Rank; Ryan Sentosa; Danielle J. Harper; Matthias Salas; Anna Gaugutz; Dana Seyringer; Stefan Nevlacsil; Alejandro Maese-Novo; Moritz Eggeling; Paul Muellner; Rainer Hainberger; Martin Sagmeister; Jochen Kraft; Rainer A. Leitgeb; Wolfgang Drexler

    In this work, we present a significant step toward in vivo ophthalmic optical coherence tomography and angiography on a photonic integrated chip. The diffraction gratings used in spectral-domain optical coherence tomography can be replaced by photonic integrated circuits comprising an arrayed waveguide grating. Two arrayed waveguide grating designs with 256 channels were tested, which enabled the first

  • High-sensitivity nanophotonic sensors with passive trapping of analyte molecules in hot spots
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-05
    Xianglong Miao; Lingyue Yan; Yun Wu; Peter Q. Liu

    Nanophotonic resonators can confine light to deep-subwavelength volumes with highly enhanced near-field intensity and therefore are widely used for surface-enhanced infrared absorption spectroscopy in various molecular sensing applications. The enhanced signal is mainly contributed by molecules in photonic hot spots, which are regions of a nanophotonic structure with high-field intensity. Therefore

  • Towards high-power, high-coherence, integrated photonic mmWave platform with microcavity solitons
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-01
    Beichen Wang; Jesse S. Morgan; Keye Sun; Mandana Jahanbozorgi; Zijiao Yang; Madison Woodson; Steven Estrella; Andreas Beling; Xu Yi

    Millimetre-wave (mmWave) technology continues to draw great interest due to its broad applications in wireless communications, radar, and spectroscopy. Compared to pure electronic solutions, photonic-based mmWave generation provides wide bandwidth, low power dissipation, and remoting through low-loss fibres. However, at high frequencies, two major challenges exist for the photonic system: the power

  • Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-01
    David Giovanni; Marcello Righetto; Qiannan Zhang; Jia Wei Melvin Lim; Sankaran Ramesh; Tze Chien Sum

    The outstanding optoelectronic performance of lead halide perovskites lies in their exceptional carrier diffusion properties. As the perovskite material dimensionality is reduced to exploit the quantum confinement effects, the disruption to the perovskite lattice, often with insulating organic ligands, raises new questions on the charge diffusion properties. Herein, we report direct imaging of >1 μm

  • Bandwidth limits of luminescent solar concentrators as detectors in free-space optical communication systems
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-01
    Mark Portnoi; Paul Anthony Haigh; Thomas J. Macdonald; Filip Ambroz; Ivan P. Parkin; Izzat Darwazeh; Ioannis Papakonstantinou

    Luminescent solar concentrators (LSCs) have recently emerged as a promising receiver technology in free-space optical communications due to their inherent ability to collect light from a wide field-of-view and concentrate it into small areas, thus leading to high optical gains. Several high-speed communication systems integrating LSCs in their detector blocks have already been demonstrated, with the

  • Adaptive dynamic range shift (ADRIFT) quantitative phase imaging
    Light Sci. Appl. (IF 13.714) Pub Date : 2021-01-01
    Keiichiro Toda; Miu Tamamitsu; Takuro Ideguchi

    Quantitative phase imaging (QPI) with its high-contrast images of optical phase delay (OPD) maps is often used for label-free single-cell analysis. Contrary to other imaging methods, sensitivity improvement has not been intensively explored because conventional QPI is sensitive enough to observe the surface roughness of a substrate that restricts the minimum measurable OPD. However, emerging QPI techniques

  • Dirac solitons in optical microresonators
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-23
    Heming Wang; Yu-Kun Lu; Lue Wu; Dong Yoon Oh; Boqiang Shen; Seung Hoon Lee; Kerry Vahala

    Mode-coupling-induced dispersion has been used to engineer microresonators for soliton generation at the edge of the visible band. Here, we show that the optical soliton formed in this way is analogous to optical Bragg solitons and, more generally, to the Dirac soliton in quantum field theory. This optical Dirac soliton is studied theoretically, and a closed-form solution is derived in the corresponding

  • Coherent suppression of backscattering in optical microresonators
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-23
    Andreas Ø. Svela; Jonathan M. Silver; Leonardo Del Bino; Shuangyou Zhang; Michael T. M. Woodley; Michael R. Vanner; Pascal Del’Haye

    As light propagates along a waveguide, a fraction of the field can be reflected by Rayleigh scatterers. In high-quality-factor whispering-gallery-mode microresonators, this intrinsic backscattering is primarily caused by either surface or bulk material imperfections. For several types of microresonator-based experiments and applications, minimal backscattering in the cavity is of critical importance

  • Dirac-vortex topological photonic crystal fibre
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-22
    Hao Lin; Ling Lu

    The success of photonic crystal fibres relies largely on the endless variety of two-dimensional photonic crystals in the cross-section. Here, we propose a topological bandgap fibre whose bandgaps along in-plane directions are opened by generalised Kekulé modulation of a Dirac lattice with a vortex phase. Then, the existence of mid-gap defect modes is guaranteed to guide light at the core of this Dirac-vortex

  • Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-22
    Boyang Xie; Hui Liu; Hua Cheng; Zhengyou Liu; Jianguo Tian; Shuqi Chen

    A four-fold-degenerate three-dimensional (3D) Dirac point, represents a degenerate pair of Weyl points carrying opposite chiralities. Moreover, 3D Dirac crystals have shown many exotic features different from those of Weyl crystals. How these features evolve from 3D Dirac to Weyl crystals is important in research on 3D topological matter. Here, we realized a pair of 3D acoustic Dirac points from band

  • Generalized laws of refraction and reflection at interfaces between different photonic artificial gauge fields
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-22
    Moshe-Ishay Cohen; Christina Jörg; Yaakov Lumer; Yonatan Plotnik; Erik H. Waller; Julian Schulz; Georg von Freymann; Mordechai Segev

    Artificial gauge fields the control over the dynamics of uncharged particles by engineering the potential landscape such that the particles behave as if effective external fields are acting on them. Recent years have witnessed a growing interest in artificial gauge fields generated either by the geometry or by time-dependent modulation, as they have been enablers of topological phenomena and synthetic

  • New solution for fast axial scanning in fluorescence microscopy
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-14
    Weijian Zong

    A novel technique based on the remote-focusing concept, using a galvanometer scanner combined with a self-fabricated “step mirror” or “tilted mirror” to transform fast lateral scanning into axial scanning, was reported as a new solution for fast, subcellular, 3D fluorescence imaging.

  • Harmonic information transitions of spatiotemporal metasurfaces
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-14
    Haotian Wu; Xin Xin Gao; Lei Zhang; Guo Dong Bai; Qiang Cheng; Lianlin Li; Tie Jun Cui

    Facilitated by ultrafast dynamic modulations, spatiotemporal metasurfaces have been identified as a pivotal platform for manipulating electromagnetic waves and creating exotic physical phenomena, such as dispersion cancellation, Lorentz reciprocity breakage, and Doppler illusions. Motivated by emerging information-oriented technologies, we hereby probe the information transition mechanisms induced

  • Microstructure and domain engineering of lithium niobate crystal films for integrated photonic applications
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-10
    Dehui Sun; Yunwu Zhang; Dongzhou Wang; Wei Song; Xiaoyan Liu; Jinbo Pang; Deqiang Geng; Yuanhua Sang; Hong Liu

    Recently, integrated photonics has attracted considerable interest owing to its wide application in optical communication and quantum technologies. Among the numerous photonic materials, lithium niobate film on insulator (LNOI) has become a promising photonic platform owing to its electro-optic and nonlinear optical properties along with ultralow-loss and high-confinement nanophotonic lithium niobate

  • Direct laser writing of volumetric gradient index lenses and waveguides
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-03
    Christian R. Ocier; Corey A. Richards; Daniel A. Bacon-Brown; Qing Ding; Raman Kumar; Tanner J. Garcia; Jorik van de Groep; Jung-Hwan Song; Austin J. Cyphersmith; Andrew Rhode; Andrea N. Perry; Alexander J. Littlefield; Jinlong Zhu; Dajie Xie; Haibo Gao; Jonah F. Messinger; Mark L. Brongersma; Kimani C. Toussaint; Lynford L. Goddard; Paul V. Braun

    Direct laser writing (DLW) has been shown to render 3D polymeric optical components, including lenses, beam expanders, and mirrors, with submicrometer precision. However, these printed structures are limited to the refractive index and dispersive properties of the photopolymer. Here, we present the subsurface controllable refractive index via beam exposure (SCRIBE) method, a lithographic approach that

  • Superchiral near fields detect virus structure
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-12-01
    Tarun Kakkar; Chantal Keijzer; Marion Rodier; Tatyana Bukharova; Michael Taliansky; Andrew J. Love; Joel J. Milner; Affar S. Karimullah; Laurence D. Barron; Nikolaj Gadegaard; Adrian J. Lapthorn; Malcolm Kadodwala

    Optical spectroscopy can be used to quickly characterise the structural properties of individual molecules. However, it cannot be applied to biological assemblies because light is generally blind to the spatial distribution of the component molecules. This insensitivity arises from the mismatch in length scales between the assemblies (a few tens of nm) and the wavelength of light required to excite

  • Tunable rainbow light trapping in ultrathin resonator arrays
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-26
    Katelyn Dixon; Arthur O. Montazeri; Moein Shayegannia; Edward S. Barnard; Stefano Cabrini; Naomi Matsuura; Hoi-Ying Holman; Nazir P. Kherani

    Rainbow light trapping in plasmonic devices allows for field enhancement of multiple wavelengths within a single device. However, many of these devices lack precise control over spatial and spectral enhancement profiles and cannot provide extremely high localised field strengths. Here we present a versatile, analytical design paradigm for rainbow trapping in nanogroove arrays by utilising both the

  • Three-dimensional nonlinear photonic crystal in naturally grown potassium–tantalate–niobate perovskite ferroelectrics
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-24
    Chang Li; Xuping Wang; Yang Wu; Fei Liang; Feifei Wang; Xiangyong Zhao; Haohai Yu; Huaijin Zhang

    Since quasi-phase-matching of nonlinear optics was proposed in 1962, nonlinear photonic crystals were rapidly developed by ferroelectric domain inversion induced by electric or light poling. The three-dimensional (3D) periodical rotation of ferroelectric domains may add feasible modulation to the nonlinear coefficients and break the rigid requirements for the incident light and polarization direction

  • Strain engineering of 2D semiconductors and graphene: from strain fields to band-structure tuning and photonic applications
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-23
    Zhiwei Peng; Xiaolin Chen; Yulong Fan; David J. Srolovitz; Dangyuan Lei

    Two-dimensional (2D) transition metal dichalcogenides (TMDCs) and graphene compose a new family of crystalline materials with atomic thicknesses and exotic mechanical, electronic, and optical properties. Due to their inherent exceptional mechanical flexibility and strength, these 2D materials provide an ideal platform for strain engineering, enabling versatile modulation and significant enhancement

  • Magnetic plasmon resonances in nanostructured topological insulators for strongly enhanced light–MoS 2 interactions
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-23
    Hua Lu; Zengji Yue; Yangwu Li; Yinan Zhang; Mingwen Zhang; Wei Zeng; Xuetao Gan; Dong Mao; Fajun Xiao; Ting Mei; Weiyao Zhao; Xiaolin Wang; Min Gu; Jianlin Zhao

    Magnetic resonances not only play crucial roles in artificial magnetic materials but also offer a promising way for light control and interaction with matter. Recently, magnetic resonance effects have attracted special attention in plasmonic systems for overcoming magnetic response saturation at high frequencies and realizing high-performance optical functionalities. As novel states of matter, topological

  • Modulation of photocarrier relaxation dynamics in two-dimensional semiconductors
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-23
    Yuhan Wang; Zhonghui Nie; Fengqiu Wang

    Due to strong Coulomb interactions, two-dimensional (2D) semiconductors can support excitons with large binding energies and complex many-particle states. Their strong light-matter coupling and emerging excitonic phenomena make them potential candidates for next-generation optoelectronic and valleytronic devices. The relaxation dynamics of optically excited states are a key ingredient of excitonic

  • Smart lasers tame complex spatiotemporal cavity dynamics
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-19
    Philippe Grelu

    By associating multimode fibers, optical wavefront manipulation, and a feedback loop controlled by a genetic algorithm, researchers have demonstrated that nonlinear spatiotemporal dynamics can be flexed within the laser cavity to achieve a user-specified objective, such as the lasing wavelength, output power, beam profile or pulsed operation.

  • Unveiling the detection dynamics of semiconductor nanowire photodetectors by terahertz near-field nanoscopy
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-19
    Eva A. A. Pogna; Mahdi Asgari; Valentina Zannier; Lucia Sorba; Leonardo Viti; Miriam S. Vitiello

    Semiconductor nanowire field-effect transistors represent a promising platform for the development of room-temperature (RT) terahertz (THz) frequency light detectors due to the strong nonlinearity of their transfer characteristics and their remarkable combination of low noise-equivalent powers (<1 nW Hz−1/2) and high responsivities (>100 V/W). Nano-engineering an NW photodetector combining high sensitivity

  • Nonlinear ionization dynamics of hot dense plasma observed in a laser-plasma amplifier
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-18
    F. Tuitje; P. Martínez Gil; T. Helk; J. Gautier; F. Tissandier; J.-P. Goddet; A. Guggenmos; U. Kleineberg; S. Sebban; E. Oliva; C. Spielmann; M. Zürch

    Understanding the behaviour of matter under conditions of extreme temperature, pressure, density and electromagnetic fields has profound effects on our understanding of cosmologic objects and the formation of the universe. Lacking direct access to such objects, our interpretation of observed data mainly relies on theoretical models. However, such models, which need to encompass nuclear physics, atomic

  • Powerful terahertz waves from long-wavelength infrared laser filaments
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-11-12
    Vladimir Yu. Fedorov; Stelios Tzortzakis

    Strong terahertz (THz) electric and magnetic transients open up new horizons in science and applications. We review the most promising way of achieving sub-cycle THz pulses with extreme field strengths. During the nonlinear propagation of two-color mid-infrared and far-infrared ultrashort laser pulses, long, and thick plasma strings are produced, where strong photocurrents result in intense THz transients

  • Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-30
    Yanan Ji; Wen Xu; Nan Ding; Haitao Yang; Hongwei Song; Qingyun Liu; Hans Ågren; Jerker Widengren; Haichun Liu

    Since selective detection of multiple narrow spectral bands in the near-infrared (NIR) region still poses a fundamental challenge, we have, in this work, developed NIR photodetectors (PDs) using photon upconversion nanocrystals (UCNCs) combined with perovskite films. To conquer the relatively high pumping threshold of UCNCs, we designed a novel cascade optical field modulation strategy to boost upconversion

  • A micromirror array with annular partitioning for high-speed random-access axial focusing
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-29
    Nathan Tessema Ersumo; Cem Yalcin; Nick Antipa; Nicolas Pégard; Laura Waller; Daniel Lopez; Rikky Muller

    Dynamic axial focusing functionality has recently experienced widespread incorporation in microscopy, augmented/virtual reality (AR/VR), adaptive optics and material processing. However, the limitations of existing varifocal tools continue to beset the performance capabilities and operating overhead of the optical systems that mobilize such functionality. The varifocal tools that are the least burdensome

  • Tailored optical propulsion forces for controlled transport of resonant gold nanoparticles and associated thermal convective fluid flows
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-27
    José A. Rodrigo; Mercedes Angulo; Tatiana Alieva

    Noble metal nanoparticles illuminated at their plasmonic resonance wavelength turn into heat nanosources. This phenomenon has prompted the development of numerous applications in science and technology. Simultaneous optical manipulation of such resonant nanoparticles could certainly extend the functionality and potential applications of optothermal tools. In this article, we experimentally demonstrate

  • Force-induced charge carrier storage: a new route for stress recording
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-27
    Yixi Zhuang; Dong Tu; Changjian Chen; Le Wang; Hongwu Zhang; Hao Xue; Conghui Yuan; Guorong Chen; Caofeng Pan; Lizong Dai; Rong-Jun Xie

    Stress sensing is the basis of human-machine interface, biomedical engineering, and mechanical structure detection systems. Stress sensing based on mechanoluminescence (ML) shows significant advantages of distributed detection and remote response to mechanical stimuli and is thus expected to be a key technology of next-generation tactile sensors and stress recorders. However, the instantaneous photon

  • Direct visualization of phase-matched efficient second harmonic and broadband sum frequency generation in hybrid plasmonic nanostructures
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-22
    Zhe Li; Brian Corbett; Agnieszka Gocalinska; Emanuele Pelucchi; Wen Chen; Kevin. M. Ryan; Pritam Khan; Christophe Silien; Hongxing Xu; Ning Liu

    Second harmonic generation and sum frequency generation (SHG and SFG) provide effective means to realize coherent light at desired frequencies when lasing is not easily achievable. They have found applications from sensing to quantum optics and are of particular interest for integrated photonics at communication wavelengths. Decreasing the footprints of nonlinear components while maintaining their

  • Ultrafast control of fractional orbital angular momentum of microlaser emissions
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-21
    Zhifeng Zhang; Haoqi Zhao; Danilo Gomes Pires; Xingdu Qiao; Zihe Gao; Josep M. Jornet; Stefano Longhi; Natalia M. Litchinitser; Liang Feng

    On-chip integrated laser sources of structured light carrying fractional orbital angular momentum (FOAM) are highly desirable for the forefront development of optical communication and quantum information–processing technologies. While integrated vortex beam generators have been previously demonstrated in different optical settings, ultrafast control and sweep of FOAM light with low-power control,

  • Thouless pumping in disordered photonic systems
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-19
    Alexander Cerjan; Mohan Wang; Sheng Huang; Kevin P. Chen; Mikael C. Rechtsman

    Thouless charge pumping protocols provide a route for one-dimensional systems to realize topological transport. Here, using arrays of evanescently coupled optical waveguides, we experimentally demonstrate bulk Thouless pumping in the presence of disorder. The degree of pumping is quite tolerant to significant deviations from adiabaticity as well as the addition of system disorder until the disorder

  • Non-Abelian generalizations of the Hofstadter model: spin–orbit-coupled butterfly pairs
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-19
    Yi Yang; Bo Zhen; John D. Joannopoulos; Marin Soljačić

    The Hofstadter model, well known for its fractal butterfly spectrum, describes two-dimensional electrons under a perpendicular magnetic field, which gives rise to the integer quantum Hall effect. Inspired by the real-space building blocks of non-Abelian gauge fields from a recent experiment, we introduce and theoretically study two non-Abelian generalizations of the Hofstadter model. Each model describes

  • Hidden-symmetry-enforced nexus points of nodal lines in layer-stacked dielectric photonic crystals
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-19
    Zhongfei Xiong; Ruo-Yang Zhang; Rui Yu; C. T. Chan; Yuntian Chen

    It was recently demonstrated that the connectivities of bands emerging from zero frequency in dielectric photonic crystals are distinct from their electronic counterparts with the same space groups. We discover that in an AB-layer-stacked photonic crystal composed of anisotropic dielectrics, the unique photonic band connectivity leads to a new kind of symmetry-enforced triply degenerate points at the

  • Asymmetric optical camouflage: tuneable reflective colour accompanied by the optical Janus effect
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-19
    Taehyun Kim; Eui-Sang Yu; Young-Gyu Bae; Jongsu Lee; In Soo Kim; Seok Chung; Seung-Yeol Lee; Yong-Sang Ryu

    Going beyond an improved colour gamut, an asymmetric colour contrast, which depends on the viewing direction, and its ability to readily deliver information could create opportunities for a wide range of applications, such as next-generation optical switches, colour displays, and security features in anti-counterfeiting devices. Here, we propose a simple Fabry–Perot etalon architecture capable of generating

  • Light-induced irreversible structural phase transition in trilayer graphene
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-13
    Jianyu Zhang; Jinsen Han; Gang Peng; Xi Yang; Xiaoming Yuan; Yongjun Li; Jianing Chen; Wei Xu; Ken Liu; Zhihong Zhu; Weiqi Cao; Zheng Han; Jiayu Dai; Mengjian Zhu; Shiqiao Qin; Kostya S. Novoselov

    A crystal structure has a profound influence on the physical properties of the corresponding material. By synthesizing crystals with particular symmetries, one can strongly tune their properties, even for the same chemical configuration (compare graphite and diamond, for instance). Even more interesting opportunities arise when the structural phases of crystals can be changed dynamically through external

  • Multispectral sensing of biological liquids with hollow-core microstructured optical fibres
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-10
    Timur Ermatov; Roman E. Noskov; Andrey A. Machnev; Ivan Gnusov; Vsevolod Аtkin; Ekaterina N. Lazareva; Sergei V. German; Sergey S. Kosolobov; Timofei S. Zatsepin; Olga V. Sergeeva; Julia S. Skibina; Pavel Ginzburg; Valery V. Tuchin; Pavlos G. Lagoudakis; Dmitry A. Gorin

    The state of the art in optical biosensing is focused on reaching high sensitivity at a single wavelength by using any type of optical resonance. This common strategy, however, disregards the promising possibility of simultaneous measurements of a bioanalyte’s refractive index over a broadband spectral domain. Here, we address this issue by introducing the approach of in-fibre multispectral optical

  • Incoherent excess noise spectrally encodes broadband light sources
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-06
    Aaron M. Kho; Tingwei Zhang; Jun Zhu; Conrad W. Merkle; Vivek J. Srinivasan

    Across optics and photonics, excess intensity noise is often considered a liability. Here, we show that excess noise in broadband supercontinuum and superluminescent diode light sources encodes each spectral channel with unique intensity fluctuations, which actually serve a useful purpose. Specifically, we report that excess noise correlations can both characterize the spectral resolution of spectrometers

  • Miniscope3D: optimized single-shot miniature 3D fluorescence microscopy
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-02
    Kyrollos Yanny; Nick Antipa; William Liberti; Sam Dehaeck; Kristina Monakhova; Fanglin Linda Liu; Konlin Shen; Ren Ng; Laura Waller

    Miniature fluorescence microscopes are a standard tool in systems biology. However, widefield miniature microscopes capture only 2D information, and modifications that enable 3D capabilities increase the size and weight and have poor resolution outside a narrow depth range. Here, we achieve the 3D capability by replacing the tube lens of a conventional 2D Miniscope with an optimized multifocal phase

  • Secure optical communication using a quantum alarm
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-10-02
    Yupeng Gong; Rupesh Kumar; Adrian Wonfor; Shengjun Ren; Richard V. Penty; Ian H. White

    Optical fibre networks are advancing rapidly to meet growing traffic demands. Security issues, including attack management, have become increasingly important for optical communication networks because of the vulnerabilities associated with tapping light from optical fibre links. Physical layer security often requires restricting access to channels and periodic inspections of link performance. In this

  • Polarimetric parity-time symmetry in a photonic system
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-27
    Lingzhi Li; Yuan Cao; Yanyan Zhi; Jiejun Zhang; Yuting Zou; Xinhuan Feng; Bai-Ou Guan; Jianping Yao

    Parity-time (PT) symmetry has attracted intensive research interest in recent years. PT symmetry is conventionally implemented between two spatially distributed subspaces with identical localized eigenfrequencies and complementary gain and loss coefficients. The implementation is complicated. In this paper, we propose and demonstrate that PT symmetry can be implemented between two subspaces in a single

  • Opening a new route to multiport coherent XUV sources via intracavity high-order harmonic generation
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-24
    Natsuki Kanda; Tomohiro Imahoko; Koji Yoshida; Akihiro Tanabashi; A. Amani Eilanlou; Yasuo Nabekawa; Tetsumi Sumiyoshi; Makoto Kuwata-Gonokami; Katsumi Midorikawa

    High-order harmonic generation (HHG) is currently utilized for developing compact table-top radiation sources to provide highly coherent extreme ultraviolet (XUV) and soft X-ray pulses; however, the low repetition rate of fundamental lasers, which is typically in the multi-kHz range, restricts the area of application for such HHG-based radiation sources. Here, we demonstrate a novel method for realizing

  • Light-modulated vertical heterojunction phototransistors with distinct logical photocurrents
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-23
    Jiayue Han; Meiyu He; Ming Yang; Qi Han; Fang Wang; Fang Zhong; Mengjian Xu; Qing Li; He Zhu; Chongxin Shan; Weida Hu; Xiaoqing Chen; Xinran Wang; Jun Gou; Zhiming Wu; Jun Wang

    The intriguing carrier dynamics in graphene heterojunctions have stimulated great interest in modulating the optoelectronic features to realize high-performance photodetectors. However, for most phototransistors, the photoresponse characteristics are modulated with an electrical gate or a static field. In this paper, we demonstrate a graphene/C60/pentacene vertical phototransistor to tune both the

  • Turning a hot spot into a cold spot: polarization-controlled Fano-shaped local-field responses probed by a quantum dot
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-21
    Juan Xia; Jianwei Tang; Fanglin Bao; Yongcheng Sun; Maodong Fang; Guanjun Cao; Julian Evans; Sailing He

    Optical nanoantennas can convert propagating light to local fields. The local-field responses can be engineered to exhibit nontrivial features in spatial, spectral and temporal domains, where local-field interferences play a key role. Here, we design nearly fully controllable local-field interferences in the nanogap of a nanoantenna, and experimentally demonstrate that in the nanogap, the spectral

  • Converting lateral scanning into axial focusing to speed up three-dimensional microscopy
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-18
    Tonmoy Chakraborty; Bingying Chen; Stephan Daetwyler; Bo-Jui Chang; Oliver Vanderpoorten; Etai Sapoznik; Clemens F. Kaminski; Tuomas P. J. Knowles; Kevin M. Dean; Reto Fiolka

    In optical microscopy, the slow axial scanning rate of the objective or the sample has traditionally limited the speed of volumetric imaging. Recently, by conjugating either a movable mirror to the image plane in a remote-focusing geometry or an electrically tuneable lens (ETL) to the back focal plane, rapid axial scanning has been achieved. However, mechanical actuation of a mirror limits the axial

  • Perovskite light-emitting/detecting bifunctional fibres for wearable LiFi communication
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-16
    Qingsong Shan; Changting Wei; Yan Jiang; Jizhong Song; Yousheng Zou; Leimeng Xu; Tao Fang; Tiantian Wang; Yuhui Dong; Jiaxin Liu; Boning Han; Fengjuan Zhang; Jiawei Chen; Yongjin Wang; Haibo Zeng

    Light fidelity (LiFi), which is emerging as a compelling technology paradigm shifting the common means of high-capacity wireless communication technologies, requires wearable and full-duplex compact design because of its great significance in smart wearables as well as the ‘Internet of Things’. However, the construction of the key component of wearable full-duplex LiFi, light-emitting/detecting bifunctional

  • Metastatic status of sentinel lymph nodes in breast cancer determined with photoacoustic microscopy via dual-targeting nanoparticles
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-16
    Yanfeng Dai; Xiang Yu; Jianshuang Wei; Fanxin Zeng; Yiran Li; Xiaoquan Yang; Qingming Luo; Zhihong Zhang

    Detection of sentinel lymph nodes (SLNs) is critical to guide the treatment of breast cancer. However, distinguishing metastatic SLNs from normal and inflamed lymph nodes (LNs) during surgical resection remains a challenge. Here, we report a CD44 and scavenger receptor class B1 dual-targeting hyaluronic acid nanoparticle (5K-HA-HPPS) loaded with the near-infra-red fluorescent dye DiR-BOA for SLN imaging

  • Spectrum projection with a bandgap-gradient perovskite cell for colour perception
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-15
    Mei-Na Zhang; Xiaohan Wu; Antoine Riaud; Xiao-Lin Wang; Fengxian Xie; Wen-Jun Liu; Yongfeng Mei; David Wei Zhang; Shi-Jin Ding

    Optoelectronic devices for light or spectral signal detection are desired for use in a wide range of applications, including sensing, imaging, optical communications, and in situ characterization. However, existing photodetectors indicate only light intensities, whereas multiphotosensor spectrometers require at least a chip-level assembly and can generate redundant signals for applications that do

  • Black phosphorus-based photothermal therapy with aCD47-mediated immune checkpoint blockade for enhanced cancer immunotherapy
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-15
    Zhongjian Xie; Minhua Peng; Ruitao Lu; Xiangying Meng; Weiyuan Liang; Zhongjun Li; Meng Qiu; Bin Zhang; Guohui Nie; Ni Xie; Han Zhang; Paras N. Prasad

    Here, we describe a combination strategy of black phosphorus (BP)-based photothermal therapy together with anti-CD47 antibody (aCD47)-based immunotherapy to synergistically enhance cancer treatment. Tumour resistance to immune checkpoint blockades in most cancers due to immune escape from host surveillance, along with the initiation of metastasis through immunosuppressive cells in the tumour microenvironment

  • A versatile photodetector assisted by photovoltaic and bolometric effects.
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-10
    Wei Jiang,Tan Zheng,Binmin Wu,Hanxue Jiao,Xudong Wang,Yan Chen,Xiaoyu Zhang,Meng Peng,Hailu Wang,Tie Lin,Hong Shen,Jun Ge,Weida Hu,Xiaofeng Xu,Xiangjian Meng,Junhao Chu,Jianlu Wang

    The advent of low-dimensional materials with peculiar structure and superb band properties provides a new canonical form for the development of photodetectors. However, the limited exploitation of basic properties makes it difficult for devices to stand out. Here, we demonstrate a hybrid heterostructure with ultrathin vanadium dioxide film and molybdenum ditelluride nanoflake. Vanadium dioxide is a

  • Single-photon emission from isolated monolayer islands of InGaN.
    Light Sci. Appl. (IF 13.714) Pub Date : 2020-09-09
    Xiaoxiao Sun,Ping Wang,Tao Wang,Ling Chen,Zhaoying Chen,Kang Gao,Tomoyuki Aoki,Mo Li,Jian Zhang,Tobias Schulz,Martin Albrecht,Weikun Ge,Yasuhiko Arakawa,Bo Shen,Mark Holmes,Xinqiang Wang

    We identify and characterize a novel type of quantum emitter formed from InGaN monolayer islands grown using molecular beam epitaxy and further isolated via the fabrication of an array of nanopillar structures. Detailed optical analysis of the characteristic emission spectrum from the monolayer islands is performed, and the main transmission is shown to act as a bright, stable, and fast single-photon

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