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  • Titanium nitride random lasing induced by the plasmon resonance effect
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-17
    Zhenzhen Shang, Luogen Deng, and Guang Dai

    Titanium nitride (TiN) is a promising plasmonic material with hard and abrasion-resistant specialities. In this study, a gain regime, namely, plasmon-enhanced random laser emission, is demonstrated in the Pyrromethene-597 (PM597) assisted by titanium nitride (TiN) film. For this, photoluminescence and random lasing are measured at different pumping energies from PM597/Silicon and PM597/TiN/Silicon

    更新日期:2020-09-18
  • Optical properties of niobium nitride plasmonic nanoantennas for the near- and mid-infrared spectral range
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-17
    Philipp Karl, Monika Ubl, Mario Hentschel, Philipp Flad, Zong-Yi Chiao, Jing-Wei Yang, Yu-Jung Lu, and Harald Giessen

    Investigating new materials plays a very important role for advancing the field of nanofabrication and nanoplasmonics. Even though niobium nitride (NbN) is mainly known for its superconducting properties when fabricating superconducting nanowire single-photon detectors, we demonstrate that it is also a material for plasmonic nanoantenna applications. In this work we measure physical properties of thin

    更新日期:2020-09-18
  • Multi-material microstereolithography using a palette with multicolor photocurable resins
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-16
    Taiki Maruyama, Hotaka Hirata, Taichi Furukawa, and Shoji Maruo

    A multi-material microstereolithography system in which multiple photocurable resins are stored on a single glass palette was developed to produce multicolor three-dimensional (3D) models. Multiple photocurable resins with different colors are replaced by moving a linear translational X-stage that supports the glass palette. A Z-stage moves radially to remove the air bubbles that adhere around the

    更新日期:2020-09-16
  • Direct writing of Cu-based micropatterns inside Cu2O nanosphere films using green femtosecond laser reductive sintering
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-16
    Mizue Mizoshiri and Atsushi Tanokuchi

    Cu-based micropatterns were fabricated using reductive sintering inside Cu2O nanosphere films induced by green femtosecond laser pulses. The linear and nonlinear absorption coefficients of Cu2O nanosphere films composed of Cu2O nanospheres, polyvinylpyrrolidone, and 2-propanol were 0.062 × 104 /cm and 10−50 cm/GW, respectively. The minimum line width was the same as the laser spot diameter (∼0.7 µm)

    更新日期:2020-09-16
  • Nanowire photonics toward wide wavelength range and subwavelength confinement [Invited]
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-16
    Masaya Notomi, Masato Takiguchi, Sylvain Sergent, Guoqiang Zhang, and Hisashi Sumikura

    Semiconductor nanowires have attracted much attention for photonic applications, especially for lasers, because of their availability in a wide variety of materials and compositions, exceptionally small size, and rich functionality. So far, most nanowire laser studies have been done in rather short wavelength (λ) ranges of less than 1 µm. In addition, the diameter (d) of most nanowire lasers has been

    更新日期:2020-09-16
  • Radio-frequency sputtering fabrication of chalcogenide-based Er3+-doped vertical optical cavities for near-infrared operation
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-15
    Simone Normani, Jan Gutwirth, Loïc Bodiou, Marion Baillieul, Loïc Joanny, Joel Charrier, Petr Nĕmec, and Virginie Nazabal

    Chalcogenide-oxide Bragg reflectors and a 1-D vertical cavity for operation at 1.55 µm were designed and fabricated via radio-frequency sputtering. The Bragg reflectors were made out of repeating layers of Al2O3 and As2Se3, and the cavity was obtained via a Ga5Ge20Sb10S65:Er3+ defect layer. The layers’ properties were assessed via ellipsometry and SEM imaging. Transmission spectroscopy verifies the

    更新日期:2020-09-16
  • Chirped and apodized grating couplers on lithium niobate thin film
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-15
    Zhihua Chen, Yufu Ning, and Yang Xun

    Chirped and apodized grating couplers were designed, fabricated and characterized in lithium niobate thin film for fiber-to-chip coupling. The maximum coupling efficiency of -1.8 dB and -6.9 dB for TE mode at a wavelength of 1550 nm was simulated and measured, respectively. The discrepancies were mainly attributed to the different fabrication errors of local periods and groove widths, which hampered

    更新日期:2020-09-16
  • Prismatic discontinuous Galerkin time domain method with an integrated generalized dispersion model for efficient optical metasurface analysis
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-16
    Wending Mai, Sawyer D. Campbell, Eric B. Whiting, Lei Kang, Pingjuan L. Werner, Yifan Chen, and Douglas H. Werner

    Planar photonics technology is expected to facilitate new physics and enhanced functionality for a new generation of disruptive optical devices. To analyze such planar optical metasurfaces efficiently, we propose a prismatic discontinuous Galerkin time domain (DGTD) method with a generalized dispersive material (GDM) model to conduct the full-wave electromagnetic simulation of planar photonic nanostructures

    更新日期:2020-09-16
  • Broadband infrared and THz transmitting silicon core optical fiber
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-14
    Trygve Sørgård, Seunghan Song, Per Erik Vullum, Cristine Kores, Kjell Martin Mølster, Fredrik Laurell, Thomas Hawkins, John Ballato, Ulf L. Österberg, and Ursula J. Gibson

    Silicon waveguide structures are a viable alternative for the transmission of signals over a wide range of frequencies, and new fabrication methods are key to increased applications. In this work, THz transparency of silicon-core, silica clad fibers, refined using a traveling solvent method, is demonstrated. The ≈ 200 µm core of these fibers is shown to have good transmission from 4.8–9 µm and 1–7

    更新日期:2020-09-15
  • Long interior carrier lifetime in selective-area InAs nanowires on silicon
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-14
    Kailing Zhang, Xinxin Li, Alexander C. Walhof, Yuzi Liu, Fatima Toor, and John P. Prineas

    Catalyst-free, position-controlled indium arsenide (InAs) nanowires (NWs) of variable diameters were grown on Si (111) by selective-area epitaxy (SAE). Ultrafast pump-probe spectroscopy was conducted, from which carrier recombination mechanisms on the NW surface and interior were resolved and characterized. NWs grown using SAE demonstrated high optical quality, showing minority carrier lifetimes more

    更新日期:2020-09-15
  • MoO3-x as a wideband optical saturable absorber for passively Q-switching ytterbium-, erbium-, and thulium-doped fiber lasers
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-14
    Meng Wang, Shaolong Huang, Yu-Jia Zeng, Ruqing Huang, Dalin Sun, Meng Wang, Jihong Pei, and Shuangchen Ruan

    Wideband optical saturable absorbers (SA) are an ideal laser component for pulse laser generation in different wavelengths, which has attracted tremendous attention in recent years. Herein, a MoO3-x-based novel wideband optical SA has been demonstrated by utilizing it for ∼1/1.5/2 μm Q-switched pulses generation. After separately integrating the MoO3-x-SA into Yb-, Er- and Tm-doped fiber lasers, passively

    更新日期:2020-09-15
  • Polymer composites based on polyvinyl chloride nanofibers and polypropylene films for terahertz photonics
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-14
    Tianmiao Zhang, Ravshanjon Nazarov, Le Quoc Pham, Viktoria Soboleva, Petr Demchenko, Mayya Uspenskaya, Roman Olekhnovich, and Mikhail Khodzitsky

    The optical properties of the polymer composites consisting of polyvinyl chloride nanofibers and polypropylene films in the frequency range of 0.2–1.0 THz were studied, and the mechanical properties of polyvinyl chloride nanofibers and the structure porosity were investigated. An iterative mathematical model based on effective medium theory was used to describe the effective refractive index and absorption

    更新日期:2020-09-15
  • Fabrication of a thermostable Ga-face GaN template on a molybdenum substrate via layer transfer
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-11
    Qing Wang, Zhiwen Liang, Qi Wang, and Guoyi Zhang

    Gallium nitride (GaN) films on high-thermal-conductivity substrates have attracted considerable attention for their applications in high-power light-emitting diodes and electronic devices. Herein, a 2-inch 8-µm-thick thermostable GaN/Mo template with Ga-face was fabricated via two consecutive layer transfer technique. The full-widths at half-maximum for the x-ray rocking curves of GaN (002) and (102)

    更新日期:2020-09-11
  • Temperature dependent spectroscopic study of Yb3+-doped KG(WO4)2, KY(WO4)2, YAlO3 and YLiF4 for laser applications
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-08
    Jörg Körner, Mathias Krüger, Jürgen Reiter, Andreas Münzer, Joachim Hein, and Malte C. Kaluza

    We present a study on temperature dependent spectroscopic data for Yb:KGW, Yb:KYW and Yb:YLF between 80 K and 280 K and Yb:YAP between 100 K and 300 K. Absorption and emission cross sections are determined. The latter ones are obtained by using a combination of the McCumber relation and the Füchtbauer-Ladenburg equation. Fluorescence lifetimes are measured within a setup optimized for the suppression

    更新日期:2020-09-08
  • Epsilon-near-zero thin-film metamaterials for wideband near-perfect light absorption
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-08
    Evan M. Smith, Jinnan Chen, Joshua R. Hendrickson, Justin W. Cleary, Chandriker Dass, Amber N. Reed, Shivashankar Vangala, and Junpeng Guo

    Absorptive metamaterials made of epsilon-near-zero indium tin oxide and silicon dioxide films are designed and fabricated for wideband perfect light absorption near the epsilon-near-zero wavelength. By increasing the number of bilayers, we achieve over 90% absorption in a spectral bandwidth of 0.95 microns.

    更新日期:2020-09-08
  • Electromagnetically tunable cholesterics with oblique helicoidal structure [Invited]
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-03
    Oleg D. Lavrentovich

    Cholesteric liquid crystals form a right-angle helicoidal structure with the pitch in the submicrometer and micrometer range. Because of the periodic modulation of the refractive index, the structure is capable of Bragg and Raman-Nath diffraction and mirrorless lasing. An attractive feature of cholesterics for optical applications is that the pitch and thus the wavelength of diffraction respond to

    更新日期:2020-09-05
  • Tailored nanocomposites for 3D printed micro-optics
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-02
    Ksenia Weber, Daniel Werdehausen, Peter König, Simon Thiele, Michael Schmid, Manuel Decker, Peter William De Oliveira, Alois Herkommer, and Harald Giessen

    Optical polymers cover only a rather narrow range of optical properties. This is a limiting factor for the design of polymer-based optical systems such as smartphone cameras. Moreover, it also poses a problem for femtosecond two-photon lithography, which is a state-of-the-art technology to 3D print high-quality optics from photopolymers. To overcome the limitations of conventional polymers, we introduce

    更新日期:2020-09-02
  • Stitching-free 3D printing of millimeter-sized highly transparent spherical and aspherical optical components
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-02
    Simon Ristok, Simon Thiele, Andrea Toulouse, Alois M. Herkommer, and Harald Giessen

    We demonstrate the fabrication of optical elements on the millimeter scale by stitching-free 3D printing via two-photon polymerization, using a commercial microfabrication system (Nanoscribe GmbH). Previous limitations are overcome by the use of a large writing field objective as well as a novel high transparency resist. The printed optical components are free of stitching defects due to a single step

    更新日期:2020-09-02
  • Spectroscopy and efficient laser operation of cleaving Yb:KY(MoO4)2 crystal
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-02
    Anna Volokitina, Pavel Loiko, Anatoly Pavlyuk, Josep Maria Serres, Sami Slimi, Ezzedine Ben Salem, Esrom Kifle, Uwe Griebner, Valentin Petrov, Li Wang, Weidong Chen, Rosa Maria Solé, Magdalena Aguiló, Francesc Díaz, and Xavier Mateos

    We report on the first laser operation of ytterbium-doped potassium yttrium double molybdate crystal (Yb:KY(MoO4)2). Single-crystals containing 3 at.% Yb3+-ions were grown by the low temperature gradient Czochralski method. The crystal structure (orthorhombic, sp. gr. D142h – Pbna) was refined with the Rietveld method. Yb:KY(MoO4)2 exhibits a layered structure leading to a strong optical anisotropy

    更新日期:2020-09-02
  • Temperature dependence of initial deformation and cracks of indium tin oxide film by quasi-continuous-wave laser irradiations
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-02
    Liping Peng, Yuan’an Zhao, Xiaofeng Liu, Zhaoliang Cao, Dawei Li, Yafei Lian, Hao Ma, Ruijin Hong, Chunxian Tao, Dawei Zhang, and Jianda Shao

    In this study, we investigated the temperature dependence of the initial deformation and cracks of indium tin oxide (ITO) thin films deposited on a fused silica substrate using a 1064-nm quasi-continuous-wave laser. We observed that the laser-induced morphology threshold of the film shows a dramatic thickness effect. The laser-induced morphology threshold of a 100-nm ITO film is four times that of

    更新日期:2020-09-02
  • Auger electron spectroscopy for surface ferroelectric domain differentiation in selectively poled MgO:LiNbO3
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-02
    Torrey McLoughlin, Wm. Randall Babbitt, Phillip A. Himmer, and Wataru Nakagawa

    Auger electron spectroscopy (AES) as a method to characterize the ferroelectric polarization domains in magnesium-doped lithium niobate crystals is demonstrated. Preliminary measurements on a test sample show a clearly identifiable relative shift in the energy of the Auger oxygen KLL transition peak between poled (inverted) and un-poled domains. Auger electrons detected from the negative polarization

    更新日期:2020-09-02
  • High-birefringence waveguide Bragg gratings fabricated in a silica-on-silicon platform with displacement Talbot lithography
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-02
    Xi-chen Luo, Chao Chen, Li Qin, Xing Zhang, Yong-yi Chen, Biao Wang, Lei Liang, Peng Jia, Yong-qiang Ning, and Li-jun Wang

    High-birefringence waveguide Bragg gratings for the C-band are fabricated in the Silica-on-Silicon platform with Displacement Talbot Lithography (DTL). Transmission and reflection spectrums of the Bragg wavelength splitting were measured and calculated. The birefringence here is up to 7.919×10−4 to 1.670×10−3, much higher than existing devices via other platforms. We illustrate the principle and advantage

    更新日期:2020-09-02
  • Roadmap for gain-bandwidth-product enhanced photodetectors
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-18
    Volker J. Sorger and Rishi Maiti

    Photodetectors are key optoelectronic building blocks performing the essential optical-to-electrical signal conversion, and unlike solar cells, operate at a specific wavelength and at high signal or sensory speeds. Towards achieving high detector performance, device physics, however, places a fundamental limit of the achievable detector sensitivity, such as responsivity and gain, when simultaneously

    更新日期:2020-09-01
  • Nanoporous SiO2 based on annealed artificial opals as a favorable material platform of terahertz optics
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-12
    V. E. Ulitko, A. K. Zotov, A. A. Gavdush, G. M. Katyba, G. A. Komandin, I. E. Spektor, I. M. Shmytko, G. A. Emelchenko, I. N. Dolganova, M. Skorobogatiy, V. N. Kurlov, V. M. Masalov, and K. I. Zaytsev

    In this paper, artificial opals, made of 300-nm-diameter nanoporous SiO2 globules by sedimentation of a colloidal suspension and annealing at different temperatures in the range of 200–1500 °C, are studied as a promising material platform for terahertz (THz) optics. Our findings reveal that THz optical properties of such materials can be predictably varied in a wide range by annealing, while being

    更新日期:2020-09-01
  • Impact of raw material surface oxide removal on dual band infrared optical properties of As2Se3 chalcogenide glass
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-26
    Anupama Yadav, Myungkoo Kang, Claudia Goncalves, Cesar Blanco, Rashi Sharma, and Kathleen Richardson

    The manufacturing of low loss chalcogenide glasses (ChGs) for optoelectronic applications is ultimately defined by the concentration of impurities present in starting materials or imparted via processing. We describe a rapid method for purifying metallic starting materials in As2Se3 glass where oxide reduction is correlated to optical and physical properties. Specifically, As-O reduction enhances the

    更新日期:2020-09-01
  • Energy transfer upconversion in Nd:YAG at cryogenic temperatures
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-03
    S. Cante and J. I. Mackenzie

    The precise characterisation of the ground state absorption cross section around 800 nm for Nd:YAG from room temperature to liquid nitrogen temperature is presented. These results enabled the measurement of the energy transfer upconversion macroparameter over the same temperature range for 0.3at.%- and 0.6at.%-doped samples via a simple automated z-scan technique. The main absorption cross section

    更新日期:2020-09-01
  • Potential of crystals with a nonuniform doping profile for a Fe2+:ZnSe laser
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-06
    E. E. Alekseev, S. Yu. Kazantsev, and S. V. Podlesnikh

    Special nonuniform doping profiles are proposed for Fe2+:ZnSe crystals, which can increase the output energy of Fe2+:ZnSe lasers in comparison with those based on active elements with a uniform distribution of the doping agent. We present the simulation results for thermoelastic stresses and distortions of the optical density that arise in a Fe2+:ZnSe crystal during pulsed pumping, with the Fe distribution

    更新日期:2020-09-01
  • Cross-section of electrical impact excitation in bulk n-type monocrystalline Al:Cr:ZnSe
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-13
    Ozarfar Gafarov, Rick Watkins, Vladimir Fedorov, and Sergey Mirov

    Middle-infrared luminescence of bulk Al:Cr:ZnSe crystal under direct electrical excitation of Cr2+,5E− 5T2 transition, is reported. Effective cross-section of electrical excitation was estimated based on comparative luminescence measurements under electrical and optical (1560 nm) excitations. Calculation of the threshold current density for lasing under electrical excitation of this material was also

    更新日期:2020-09-01
  • Temperature dependent absorption and emission spectra of Tm:CaF2
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-13
    Jürgen Reiter, Jörg Körner, Jan Pejchal, Akira Yoshikawa, Joachim Hein, and Malte C. Kaluza

    We present Emission and absorption cross sections of thulium doped calcium fluoride (Tm:CaF2) in the visible to short wave infrared (SWIR) wavelength range for temperatures between 80 K and 300 K. For spectral regions of high and low absorption the McCumber relation and the Fuchtbauer–Ladenburg equation have been used to give reliable results. Furthermore, an estimation for the cross relaxation efficiency

    更新日期:2020-09-01
  • Spectroscopy of thulium-doped tantalum pentoxide waveguides on silicon
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-18
    Amy S. K. Tong, Colin J. Mitchell, Armen Aghajani, Neil Sessions, G. Senthil Murugan, Jacob I. Mackenzie, and James S. Wilkinson

    The spectroscopic properties and laser operation of thulium-doped tantalum pentoxide (Tm:Ta2O5) waveguides are reported in this paper. Fluorescence ranging from 1600 nm to 2200 nm, corresponding to the 3F4 → 3H6 transition was observed from 3 wt% Tm:Ta2O5 waveguides pumped at a wavelength of 795 nm. Measurements of excited-state lifetime, the emission and absorption spectra, with subsequent calculation

    更新日期:2020-09-01
  • Luminescent patterns recorded by laser irradiation of a PMMA matrix with a soluble CdS precursor
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-12
    Anton A. Smirnov, Vadim Elagin, Andrey Afanasiev, Alexander Pikulin, and Nikita Bityurin

    Direct laser writing of luminescent patterns within the material consisting of the polymer (PMMA) matrix with dissolved precursor (TEDBCd) molecules is demonstrated. The luminescence here is related to the UV induced growth of CdS nanoparticles. The irradiation was performed by the third harmonic of a Nd:YAG laser with a pulse duration of 15 ns. The irradiated polymer films were kept at ambient temperatures

    更新日期:2020-09-01
  • Sub-bandgap pulsed laser patterning of planar chalcogenide microphotonics
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-12
    Dun Mao, Mingkun Chen, Xiangyu Ma, Anishkumar Soman, Huadan Xing, Thomas Kananen, Nathan Augenbraun, Chen Cheng, Matthew Doty, and Tingyi Gu

    Chalcogenide based micro-devices, including integrated photonic waveguides and metasurfaces, have broad applications from mid-infrared nonlinear optical signal processing to reconfigurable photonic metasurfaces. Laser machining is a flexible and cost-effective method for lithography-free patterning and postprocessing of large scale microphotonics. In the past, patterning of chalcogenide thin film materials

    更新日期:2020-09-01
  • Efficient random lasing in topologically directed assemblies of blue-phase liquid crystal microspheres
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-03
    Sumanyu Chauhan, Souptik Mukherjee, Andrii Varanytsia, Chien Tsung Hou, Lu Zou, and Liang-Chy Chien

    Controlling light flow in the directed-assembly of blue-phase liquid crystal (BPLC) microspheres with curvature boundaries and random domain of cubic lattices is a highly interesting photonic phenomenon. A strategy of efficient random lasing with resonant feedback based on a microemulsion comprising of BPLC, laser dye and block copolymer is presented here. BPLCs are produced with a microfluidic apparatus

    更新日期:2020-09-01
  • Enabling switchable and multifunctional terahertz metasurfaces with phase-change material
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-04
    Dacheng Wang, Song Sun, Zheng Feng, and Wei Tan

    Achieving switchable and diversified functionalities in a single metasurface has garnered great research interest for potential terahertz applications. Here, we propose and demonstrate a phase-change metasurface that simultaneously supports broadband electromagnetically induced transparency (EIT) and broadband nearly perfect absorption, depending on the phase state of a phase change material-vanadium

    更新日期:2020-09-01
  • Optical waveguide xylene gas sensor based on sodium dodecylbenzene sulfonate (SDBS)–TiO2 film for detection at room temperature
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-24
    Yuan Zhang, Patima Nizamidin, Hannikezi Abudukeremu, and Abliz Yimit

    The effectiveness of a highly sensitive sodium dodecyl benzenesulfonate (SDBS)–TiO2 thin film optical waveguide gas sensor assessed in detecting various organic gases. Gas sensing measurements indicated that the sensing element has good selectivity, high sensitivity, and a low detection limit of 1 ppb to xylene gas with fast response and short recovery times. Interference gas test results showed that

    更新日期:2020-09-01
  • Tunable terahertz metamaterial absorber based on electricity and light modulation modes
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-24
    Jinfeng Wang, Tingting Lang, Zhi Hong, Tingting Shen, and Gangqi Wang

    In this paper, a metamaterial absorber that achieved absorption tuning by electricity and light control has been proposed in the terahertz (THz) regime. The THz absorber exhibits an absorbance of 97.5% at a resonant frequency of 0.245 THz. First, we simulated the absorption spectra under different structural parameters. Then the absorption characteristics are analyzed under different Fermi energies

    更新日期:2020-09-01
  • Bifunctional tunable terahertz circular polarization converter based on Dirac semimetals and vanadium dioxide
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-26
    Chuanhao Yang, Qinggang Gao, Linlin Dai, Yanliang Zhang, Huiyun Zhang, and Yuping Zhang

    We present a bifunctional polarization converter based on Dirac semimetals (DSMs) and vanadium dioxide (VO2), which consists of two layers of DSMs on both sides, a metal grating and a VO2 board. The polarization converter frequency is dynamically tuned by changing the Fermi energy level of the DSMs. The result suggests that when VO2 is in an insulated state, the device behaves as a transmissive polarization

    更新日期:2020-09-01
  • Enhancement of the fluorescence property of carbon quantum dots based on laser ablated gold nanoparticles to evaluate pyrene
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-24
    Amir Reza Sadrolhosseini, Ganesan Krishnan, Suhaidi Safie, Mahnoush Beygisangchin, Suraya Abdul Rashid, and Sulaiman Wadi Harun

    Gold nanoparticles were prepared in a carbon quantum dots solution using the laser ablation technique to enhance the photoluminescence property of a carbon quantum dots solution. The gold plate was ablated using a Q-Switched Nd:YAG laser at 4, 8, 12, and 16 minutes with a stable laser energy. The optical properties, functional groups, and the morphology of the prepared samples were examined using UV-visible

    更新日期:2020-09-01
  • Few-layered α-Fe2O3 nanoflake saturable absorber for stable MIR pulse generation
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-27
    Li Dong, Hongwei Chu, Ying Li, Shengzhi Zhao, Guiqiu Li, and Dechun Li

    Hematite (α-Fe2O3), as one of the most prevalent transition metal oxides (TMOs) on the Earth, has been the hot spot of intense research for recent decades. Understanding the optical signatures in hematite is essential for the design of α-Fe2O3-based devices in the photoelectrochemical and photonic fields. In the present work, we successfully synthesized hematite nanoflakes by the facile oil bath method

    更新日期:2020-09-01
  • Nonlinear optical measurements of CdSiP2 at near and mid-infrared wavelengths
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-05
    Manuel R. Ferdinandus, Jamie J. Gengler, Kent L. Averett, Kevin T. Zawilski, Peter G. Schunemann, and Carl M. Liebig

    We measure the birefringence of the nonlinear optical (NLO) properties of cadmium silicon phosphide via the Z-scan technique at near and mid-infrared wavelengths. We discuss the implications of the NLO properties on optical parametric amplifier performance. We find that the nonlinear absorption does reduce the conversion efficiency, while the nonlinear refraction has a negligible effect.

    更新日期:2020-09-01
  • Space charge assisted evaluation method of the elasto-optic coefficients of electrooptic crystals
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-17
    Tadayuki Imai, Sohan Kawamura, and Soichi Oka

    We developed a novel technique to evaluate the elasto-optic coefficients of electrooptic (EO) single crystals. Notably, this method uses the deformation of the crystal generated by the space charge formed by the electrons injected into the crystal. For the first time, to our knowledge, the coefficient p12 was quantified separately from p11 for KTa1-xNbxO3(KTN) with this method. Both the coefficients

    更新日期:2020-09-01
  • Novel UV-transparent 2-component polyurethane resin for chip-on-board LED micro lenses
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-10
    Joachim Bauer, Marko Gutke, Friedhelm Heinrich, Matthias Edling, Vesela Stoycheva, Alexander Kaltenbach, Martin Burkhardt, Martin Gruenefeld, Matthias Gamp, Christoph Gerhard, Patrick Steglich, Sebastian Steffen, Michael Herzog, Christian Dreyer, and Sigurd Schrader

    In this work we present a novel optical polymer system based on polyurethane elastomer components, which combines excellent UV transparency with high thermal stability, good hardness, high surface tension and long pot life. The material looks very promising for encapsulation and microlensing applications for chip-on-board (CoB) light-emitting diodes (LED). The extinction coefficient k, refractive index

    更新日期:2020-09-01
  • Rabi splitting obtained in a monolayer BP-plasmonic heterostructure at room temperature
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-14
    Yan Huang, Yan Liu, Yao Shao, Genquan Han, Jincheng Zhang, and Yue Hao

    Hybrid exciton states can be formed under the strong coupling of plasmons excited by metal nanostructures and excitons. Because of the large exciton binding energy, black phosphorus (BP) is an ideal platform to investigate the strong coupling. In this paper, we first demonstrate the strong coupling between local surface plasmon modes of different metal nanostructures and excitons in monolayer BP by

    更新日期:2020-09-01
  • Patterned sapphire substrates cause a wavelength shift of green InGaN light-emitting diodes
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-03
    Haoyang Wu, Shengrui Xu, Lansheng Feng, Wei Mao, Hongchang Tao, Yuan Gao, Yuzhi Huang, Xuewei Wang, Wen Li, Huake Su, Jincheng Zhang, and Yue Hao

    InGaN/GaN multiple quantum wells (MQWs) were fabricated under the same growth conditions on the planar and patterned sapphire substrates (PSS) with 10 nm and 20 nm sputtering AlN layers, respectively. Photoluminescence and electroluminescence results both showed that MQWs samples have significant differences in emission wavelengths. The wavelength of the samples on planar substrate is about 20 nm longer

    更新日期:2020-09-01
  • Superlattice hole injection layers for UV LEDs grown on SiC
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-14
    Christian J. Zollner, Abdullah S. Almogbel, Yifan Yao, Michael Wang, Michael Iza, James S. Speck, Steven P. DenBaars, and Shuji Nakamura

    AlGaN-based germicidal UV LEDs show promise in fighting the COVID-19 pandemic through disinfection of air, water, and surfaces. We report UV LEDs grown by MOCVD on SiC substrates, fabricated into thin-film flip chip devices. Replacing the uniform p-AlxGa1-xN layer (x = 0.2) with a short-period-superlattice of alternating (x = 0.1 and 0.8) Al-composition improved EQE from 1.3% to 2.7% (3.2% with encapsulation)

    更新日期:2020-09-01
  • Growth and characterization of low-temperature Si1-xSnx on Si using plasma enhanced chemical vapor deposition
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-24
    Seyedeh Fahimeh Banihashemian, Joshua M. Grant, Abbas Sabbar, Huong Tran, Oluwatobi Olorunsola, Solomon Ojo, Sylvester Amoah, Mehrshad Mehboudi, Shui-Qing Yu, Aboozar Mosleh, and Hameed A. Naseem

    Silicon-tin (Si1-xSnx) films have been grown using plasma-enhanced chemical vapor deposition on Si (001) substrate. X-ray photoelectron spectroscopy characterization of the thin films show successful substitutional incorporation of Sn in Si lattice up to 3.2%. The X-ray diffraction characterizations show epitaxial growth of Si1-xSnx films (001) direction. The Sn incorporation has been measured using

    更新日期:2020-09-01
  • Ultraviolet hollow-core waveguides with sub-unitary index chalcogenide cladding
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-24
    Jinxiang Li, Behrad Gholipour, Davide Piccinotti, Kevin F. MacDonald, and Nikolay I. Zheludev

    The chalcogenide semiconductor antimony telluride exhibits a sub-unitary refractive index as low as 0.7 at mid- to near-UV wavelengths between 220 and 400 nm, with the spectral width of the sub-unitary band, minimum index and associated extinction coefficient being controllable functions of alloy composition. As such it can enable step-index hollow-core optical waveguiding at ultraviolet wavelengths

    更新日期:2020-09-01
  • Transparent planar indium tin oxide for a thermo-photovoltaic selective emitter
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-09-01
    Yu-Bin Chen, Parag Parashar, Yi-Hua Yang, Tejender Singh Rawat, Shih-Wei Chen, Chang-Hong Shen, Da-Chiang Chang, Jia-Ming Shieh, Pei-Chen Yu, Tseung-Yuen Tseng, and Albert S. Lin

    Designing an efficient emitter design is an important step for achieving a highly efficient TPV conversion process. Wavelength-selective emissivity, spectra match between the emitter and TPV cells, and high thermal stability are three main characteristics that must be considered before implementing the emitter. In this work, an indium tin oxide (ITO)/sapphire emitter structure is investigated for TPV

    更新日期:2020-09-01
  • Dynamically controlled random lasing with colloidal titanium carbide MXene
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-27
    Zhuoxian Wang, Shaimaa I. Azzam, Xiangeng Meng, Mohamed Alhabeb, Krishnakali Chaudhuri, Kathleen Maleski, Young L. Kim, Alexander V. Kildishev, Vladimir M. Shalaev, Yury Gogotsi, and Alexandra Boltasseva

    Control of lasing properties through tailorable and dynamically tunable materials and reconfigurable compositions can augment the performance of random lasers for a wide range of applications. Here, a colloid of randomly dispersed weakly scattering single-layer titanium carbide (Ti3C2Tx) MXene flakes embedded within rhodamine 101 gain medium is experimentally shown to provide feedback for random lasing

    更新日期:2020-09-01
  • Chemical vapor deposition synthesized monolayer MoS2 for Q-switching pulse generation in the 2 µm spectral region
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-31
    Jingcheng Shang, Tianli Feng, Shengzhi Zhao, Tao Li, Jie Ma, Xiaomin Xu, Norbert Koch, and Jia Zhao

    We demonstrate a monolayer MoS2-based saturable absorber (SA) synthesized by chemical vapor deposition (CVD). The as-grown SA has high spatial homogeneity and shows excellent saturable absorption properties in the 2 µm wavelength region. A higher modulation depth of 21.3% and lower saturation intensity of 0.47 MW/cm2 are achieved compared with those of other documented MoS2 SAs to date. When applying

    更新日期:2020-09-01
  • Chemical vapor deposition synthesized monolayer MoS2 for Q-switching pulse generation in the 2 µm spectral region
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-31
    Jingcheng Shang, Tianli Feng, Shengzhi Zhao, Tao Li, Jie Ma, Xiaomin Xu, Norbert Koch, and Jia Zhao

    We demonstrate a monolayer MoS2-based saturable absorber (SA) synthesized by chemical vapor deposition (CVD). The as-grown SA has high spatial homogeneity and shows excellent saturable absorption properties in the 2 µm wavelength region. A higher modulation depth of 21.3% and lower saturation intensity of 0.47 MW/cm2 are achieved compared with those of other documented MoS2 SAs to date. When applying

    更新日期:2020-08-31
  • Few-layered α-Fe2O3 nanoflake saturable absorber for stable MIR pulse generation
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-27
    Li Dong, Hongwei Chu, Ying Li, Shengzhi Zhao, Guiqiu Li, and Dechun Li

    Hematite (α-Fe2O3), as one of the most prevalent transition metal oxides (TMOs) on the Earth, has been the hot spot of intense research for recent decades. Understanding the optical signatures in hematite is essential for the design of α-Fe2O3-based devices in the photoelectrochemical and photonic fields. In the present work, we successfully synthesized hematite nanoflakes by the facile oil bath method

    更新日期:2020-08-27
  • Dynamically controlled random lasing with colloidal titanium carbide MXene
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-08-27
    Zhuoxian Wang, Shaimaa I. Azzam, Xiangeng Meng, Mohamed Alhabeb, Krishnakali Chaudhuri, Kathleen Maleski, Young L. Kim, Alexander V. Kildishev, Vladimir M. Shalaev, Yury Gogotsi, and Alexandra Boltasseva

    Control of lasing properties through tailorable and dynamically tunable materials and reconfigurable compositions can augment the performance of random lasers for a wide range of applications. Here, a colloid of randomly dispersed weakly scattering single-layer titanium carbide (Ti3C2Tx) MXene flakes embedded within rhodamine 101 gain medium is experimentally shown to provide feedback for random lasing

    更新日期:2020-08-27
  • New additions to the OMEx team: editorial
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-07-09
    Alexandra Boltasseva

    Editor-in-Chief Alexandra Boltasseva introduces new Optical Materials Express Associate Editors Shekhar Guha and Germano Montemezzani.

    更新日期:2020-08-20
  • Multiphoton photoreduction for dual-wavelength-light-driven shrinkage and actuation in hydrogel
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-07-24
    Kosuke Mizuguchi, Yo Nagano, Hiroaki Nishiyama, Hiroaki Onoe, and Mitsuhiro Terakawa

    The dual-wavelength-driven shrinkage of metal microstructures and hydrogel actuation are demonstrated by the fabrication of multi-metal microstructures in hydrogels by multiphoton photoreduction. Silver and gold microstructures were fabricated in a poly-N-isopropylacrylamide (PNIPAm) hydrogel. Because of the different optical resonances of the metals, wavelength-dependent shrinkage of metal microstructures

    更新日期:2020-08-20
  • Loss compensation in metamaterials and plasmonics with virtual gain [Invited]
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-07-17
    Anindya Ghoshroy, Şahin K. Özdemir, and Durdu Ö. Güney

    Metamaterials and plasmonics potentially offer an ultimate control of light to enable a rich number of non-conventional devices and a testbed for many novel physical phenomena. However, optical loss in metamaterials and plasmonics is a fundamental challenge rendering many conceived applications not viable in practical settings. Many approaches have been proposed so far to mitigate losses, including

    更新日期:2020-08-20
  • Chromium doped zinc selenide optical fiber lasers
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-07-16
    Justin R. Sparks, Stephen C. Aro, Rongrui He, Melanie L. Goetz, James P. Krug, Sean A. McDaniel, Patrick A. Berry, Gary Cook, Kenneth L. Schepler, Pier J. Sazio, Venkatraman Gopalan, and John V. Badding

    The optical fiber geometry is known for rugged, high power laser sources that are preferred for many applications, but is typically limited to the visible and near-infrared regions of the electromagnetic spectrum due to the transmission limits of silica (< 2 µm). This wavelength range could be extended into the mid-infrared using transition metal doped, crystalline II-VI optical gain media, but these

    更新日期:2020-08-20
  • High-contrast lead-free pair of soft glasses for large numerical aperture imaging bundles
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-07-21
    Ryszard Stepien, Jaroslaw Cimek, Dariusz Pysz, Ireneusz Kujawa, Przemyslaw Golebiewski, Grzegorz Stepniewski, Krzysztof Orlinski, Ryszard Buczynski, and Rafal Kasztelanic

    Development of high numerical aperture fiber bundles (FBs) requires use of thermally matched pair of glasses with a high difference of refractive indices. We have developed a pair of glasses with high refractive index contrast ΔnD>0.2, suitable for fabrication of optical fiber bundles with numerical aperture NA > 0.85. Core glass was synthetized in the lanthanum oxide system Nb2O5-Ta2O5-SiO2-ZrO2-

    更新日期:2020-08-20
  • Crystal structure, photoluminescence and cathodoluminescence of Ba1-xSrxAl2O4 doped with Eu2+
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-07-27
    Max Volhard, Liping Yu, Daniel den Engelsen, George R. Fern, Terry G. Ireland, and Jack Silver

    Herein we describe the synthesis, crystal structures, photoluminescence (PL) and cathodoluminescence (CL) spectra of phosphors in the Sr0.97-xBaxEu0.03Al2O4 system between x = 0 and x = 0.97. The syntheses of these phosphors were carried out by solid state reactions at 1350°C in mixed gas (H2/N2). The molar fractions of the alkaline earth elements were varied in steps of 0.1. The Sr1-xBaxAl2O4 series

    更新日期:2020-08-20
  • Photoluminescence and cathodoluminescence of BaAl2O4:Eu2+ and undoped BaAl2O4: evidence for F-centres
    Opt. Mater. Express (IF 3.064) Pub Date : 2020-07-27
    Daniel den Engelsen, George R. Fern, Terry G. Ireland, Fengli Yang, and Jack Silver

    In this article the photoluminescence (PL) and cathodoluminescence (CL) of undoped BaAl2O4 and BaAl2O4 doped with 500 ppm and 3 mol% Eu2+ is described. The most important results from the CL measurements are: (1) Undoped BaAl2O4 manifested intrinsic CL at 460 nm, which increased at low temperature and did not change significantly upon exposure to the e-beam; (2) Doping BaAl2O4 with Eu2+ changed the

    更新日期:2020-08-20
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