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  • Doppler velocimeter based on dual-comb absorption spectroscopy
    Photonics Res. (IF 6.099) Pub Date : 2020-11-23
    Chenglin Gu, Xing Zou, Zhong Zuo, Daowang Peng, Yuanfeng Di, Yang Liu, Daping Luo, and Wenxue Li

    The determination of airflow parameters is essential to the research of critical information on environment monitoring, chemical kinetics, and aerodynamic and propulsion applications. During the past few decades, tunable diode laser absorption spectroscopy has become a common and efficient tool for the flow velocity measurement based on the Doppler shift of the absorption line. Dual-comb absorption

    更新日期:2020-11-25
  • Golden hour for perovskite photonics
    Photonics Res. (IF 6.099) Pub Date : 2020-11-20
    Qing Zhang, Carole Diederichs, and Qihua Xiong

    Halide perovskite semiconductors have emerged as promising candidates for the next-generation low-energy consumption, high-flexibility photonics and optoelectronic devices thanks to their superior optical and excitonic properties as well as fabrication convenience. This special issue, including three review papers and six original research papers, focuses on the studies of both fundamentals and applications

    更新日期:2020-11-21
  • Comparison of growth structures for continuous-wave electrically pumped 1.55 μm quantum dash lasers grown on (001) Si
    Photonics Res. (IF 6.099) Pub Date : 2020-11-20
    Wei Luo, Ying Xue, Jie Huang, Liying Lin, Bei Shi, and Kei May Lau

    Semiconductor lasers directly grown on silicon offer great potential as critical components in high-volume, low-cost integrated silicon photonics circuits. Although InAs/InP quantum dash (QDash) lasers on native InP substrate emitting at 1.5 μm (C-band) have demonstrated notable performance, the growth of InAs/InP QDash lasers on silicon remains undeveloped because of the 8% lattice mismatch between

    更新日期:2020-11-21
  • Superior third-order nonlinearity in inorganic fullerene-like WS2 nanoparticles
    Photonics Res. (IF 6.099) Pub Date : 2020-11-20
    Tianlun Li, Rui Hao, Lingling Zhang, Jianyong Mao, Feng Li, Yanpeng Zhang, Jixiang Fang, and Lei Zhang

    Two-dimensional (2D) transition metal dichalcogenides (TMDs) attain increasing attention due to their exceptional nonlinear optical efficiencies, which hold promising potential for on-chip photonics and advanced optoelectronic applications. Planar TMDs have been proven to support orders-higher third-order nonlinear coefficients in comparison with common nonlinear materials. Interestingly, stronger

    更新日期:2020-11-21
  • Confocal visible/NIR photoacoustic microscopy of tumors with structural, functional, and nanoprobe contrasts
    Photonics Res. (IF 6.099) Pub Date : 2020-11-19
    Jiangbo Chen, Yachao Zhang, Xiaozhen Li, Jingyi Zhu, Dengfeng Li, Shengliang Li, Chun-Sing Lee, and Lidai Wang

    Distinguishing early-stage tumors from normal tissues is of great importance in cancer diagnosis. We report fiber-based confocal visible/near-infrared (NIR) optical-resolution photoacoustic microscopy that can image tumor microvasculature, oxygen saturation, and nanoprobes in a single scanning. We develop a cost-efficient single laser source that provides 532, 558, and 1064 nm pulsed light with sub-microseconds

    更新日期:2020-11-19
  • Mid-infrared Q-switch performance of ZrC
    Photonics Res. (IF 6.099) Pub Date : 2020-11-19
    Yangyang Liang, Tao Li, Wenchao Qiao, Tianli Feng, Shengzhi Zhao, Yuefeng Zhao, Yuzhi Song, and Christian Kränkel

    Zirconium carbide (ZrC) with layered structure and nanoparticle morphology was prepared by sonication in an ethyl alcohol solvent. The morphology and saturable absorption properties of the ZrC were systematically analyzed. By using ZrC nanoparticle coated substrates as saturable absorbers, stable Q-switched 3 μm Er:Lu2O3 lasers were realized. Pulse durations of 50 ns with pulse energies of 20 μJ and

    更新日期:2020-11-19
  • High detectivity photodetectors based on perovskite nanowires with suppressed surface defects
    Photonics Res. (IF 6.099) Pub Date : 2020-11-19
    Guohui Li, Rui Gao, Yue Han, Aiping Zhai, Yucheng Liu, Yue Tian, Bining Tian, Yuying Hao, Shengzhong Liu, Yucheng Wu, and Yanxia Cui

    Solution-processable, single-crystalline perovskite nanowires are ideal candidates for developing low-cost photodetectors, but their detectivities are limited due to a high level of unintentional defects. Through the surface-initiated solution-growth method, we fabricated high-quality, single-crystalline, defects-suppressed MAPbI3 nanowires, which possess atomically smooth side surfaces with a surface

    更新日期:2020-11-19
  • Compact and broadband multimode waveguide bend by shape-optimizing with transformation optics
    Photonics Res. (IF 6.099) Pub Date : 2020-11-17
    Shuyi Li, Lifeng Cai, Dingshan Gao, Jianji Dong, Jin Hou, Chunyong Yang, Shaoping Chen, and Xinliang Zhang

    Multimode waveguide bend is one of the key components for realizing high-density mode-division multiplexing systems on chip. However, the reported multimode waveguide bends are either large, bandwidth-limited or fabrication-complicated, which hinders their applications in future high-density multimode photonic circuits. Here we propose a compact multimode waveguide bend supporting four TE modes simply

    更新日期:2020-11-17
  • Boosting a sub-10 nm nanogap array by plasmon-triggered waveguide resonance
    Photonics Res. (IF 6.099) Pub Date : 2020-11-17
    Yu Tian, Hailong Wang, Yijia Geng, Lili Cong, Yu Liu, Weiqing Xu, and Shuping Xu

    Gap-type metallic nanostructures are widely used in catalytic reactions, sensors, and photonics because the hotspot effect on these nanostructures supports giant local electromagnetic field enhancement. To achieve hotspots, researchers devote themselves to reducing gap distances, even to 1 nm. However, current techniques to fabricate such narrow gaps in large areas are still challenging. Herein, a

    更新日期:2020-11-17
  • Engineering a light–matter strong coupling regime in perovskite-based plasmonic metasurface: quasi-bound state in the continuum and exceptional points
    Photonics Res. (IF 6.099) Pub Date : 2020-11-12
    Leran Lu, Quynh Le-Van, Lydie Ferrier, Emmanuel Drouard, Christian Seassal, and Hai Son Nguyen

    We present theoretically the formation of exciton–photon polaritons and exciton-surface plasmon polaritons in a perovskite-based subwavelength lattice on the metallic plane. It is shown that the later polaritons will be achieved as the perovskite layer is ultra-thin (<50 nm), while the co-existence of both polaritons will dominate, as the thickness of the perovskite metasurface approaches wavelength-scale

    更新日期:2020-11-15
  • Weak-value amplification for the optical signature of topological phase transitions
    Photonics Res. (IF 6.099) Pub Date : 2020-11-05
    Weijie Wu, Shizhen Chen, Wenhao Xu, Zhenxing Liu, Runnan Lou, Lihua Shen, Hailu Luo, Shuangchun Wen, and Xiaobo Yin

    We show that weak measurements can be used to measure the tiny signature of topological phase transitions. The signature is an in-plane photonic spin Hall effect, which can be described as a consequence of a Berry phase. It is also parallel to the propagation direction of a light beam. The imaginary part of the weak value can be used to analyze ultrasmall longitudinal phase shifts in different topological

    更新日期:2020-11-15
  • Emerging micro-additive manufacturing technologies enabled by novel optical methods
    Photonics Res. (IF 6.099) Pub Date : 2020-11-12
    Wei Lin, Dihan Chen, and Shih-Chi Chen

    This paper presents a comprehensive review of recent advances in micro-additive manufacturing enabled by novel optical methods with an emphasis on photopolymerization-based printing processes. Additive manufacturing, also known as three-dimensional (3D) printing, has become an important engineering solution to construct customized components or functional devices at low cost. As a green manufacturing

    更新日期:2020-11-15
  • Resolution-enhanced intensity diffraction tomography in high numerical aperture label-free microscopy
    Photonics Res. (IF 6.099) Pub Date : 2020-11-12
    Jiaji Li, Alex Matlock, Yunzhe Li, Qian Chen, Lei Tian, and Chao Zuo

    We propose label-free and motion-free resolution-enhanced intensity diffraction tomography (reIDT) recovering the 3D complex refractive index distribution of an object. By combining an annular illumination strategy with a high numerical aperture (NA) condenser, we achieve near-diffraction-limited lateral resolution of 346 nm and axial resolution of 1.2 μm over 130 μm×130 μm×8 μm volume. Our annular

    更新日期:2020-11-15
  • Phase segregation in inorganic mixed-halide perovskites: from phenomena to mechanisms
    Photonics Res. (IF 6.099) Pub Date : 2020-10-30
    Yutao Wang, Xavier Quintana, Jiyun Kim, Xinwei Guan, Long Hu, Chun-Ho Lin, Brendon Tyler Jones, Weijian Chen, Xiaoming Wen, Hanwei Gao, and Tom Wu

    Halide perovskites, such as methylammonium lead halide perovskites (MAPbX3, X=I, Br, and Cl), are emerging as promising candidates for a wide range of optoelectronic applications, including solar cells, light-emitting diodes, and photodetectors, due to their superior optoelectronic properties. All-inorganic lead halide perovskites CsPbX3 are attracting a lot of attention because replacing the organic

    更新日期:2020-11-15
  • Cavity engineering of two-dimensional perovskites and inherent light-matter interaction
    Photonics Res. (IF 6.099) Pub Date : 2020-10-30
    Shuai Zhang, Yangguang Zhong, Fan Yang, Qinxuan Cao, Wenna Du, Jianwei Shi, and Xinfeng Liu

    Two-dimensional (2D) perovskites are hybrid layered materials in which the inorganic lattice of an octahedron is sandwiched by organic layers. They behave as a quantum-well structure exhibiting large exciton binding energy and high emission efficiency, which is excellent for photonic applications. Hence, the cavity modulation and cavity devices of 2D perovskites are widely investigated. In this review

    更新日期:2020-11-15
  • Manipulating light radiation from a topological perspective
    Photonics Res. (IF 6.099) Pub Date : 2020-10-21
    Xuefan Yin and Chao Peng

    Manipulating radiation is important for a variety of optoelectronic applications, such as on-chip lasers, energy-efficient grating couplers, and antennas for light detection and ranging. Although designing and optimizing those optoelectronic devices are usually believed to be an engineering-oriented task, recent research reveals that the principles underlying radiation manipulation are closely connected

    更新日期:2020-11-15
  • Topologically protected long-range coherent energy transfer
    Photonics Res. (IF 6.099) Pub Date : 2020-10-30
    Yujing Wang, Jun Ren, Weixuan Zhang, Lu He, and Xiangdong Zhang

    The realization of robust coherent energy transfer with a long range from a donor to an acceptor has many important applications in the field of quantum optics. However, it is hard to be realized using conventional schemes. Here, we demonstrate theoretically that robust energy transfer can be achieved using a photonic crystal platform, which includes the topologically protected edge state and zero-dimensional

    更新日期:2020-11-15
  • Micro- and nano-fiber probes for optical sensing, imaging, and stimulation in biomedical applications
    Photonics Res. (IF 6.099) Pub Date : 2020-10-22
    Xia Yu, Shuyan Zhang, Malini Olivo, and Nanxi Li

    The flexibile nature of optical fiber enables it to offer remote-access capabilities, which could be used in many biomedical applications. This review focuses on different micro- and nano-structured fiber probes for applications in biosensing, imaging, and stimulations. The modifications to fiber could extend design freedom from waveguide optimization to functional material integration. Fiber probes

    更新日期:2020-11-15
  • Dispersion-limited versus power-limited terahertz communication links using solid core subwavelength dielectric fibers
    Photonics Res. (IF 6.099) Pub Date : 2020-10-22
    Kathirvel Nallappan, Yang Cao, Guofu Xu, Hichem Guerboukha, Chahé Nerguizian, and Maksim Skorobogatiy

    Terahertz (THz) band (0.1–10 THz) is the next frontier for ultra-high-speed communication systems. Currently, most of communications research in this spectral range is focused on wireless systems, while waveguide/fiber-based links have been less explored. Although free space communications have several advantages such as convenience in mobility for the end user, as well as easier multi-device interconnectivity

    更新日期:2020-11-15
  • High-speed dual-view band-limited illumination profilometry using temporally interlaced acquisition
    Photonics Res. (IF 6.099) Pub Date : 2020-10-30
    Cheng Jiang, Patrick Kilcullen, Yingming Lai, Tsuneyuki Ozaki, and Jinyang Liang

    We report dual-view band-limited illumination profilometry (BLIP) with temporally interlaced acquisition (TIA) for high-speed, three-dimensional (3D) imaging. Band-limited illumination based on a digital micromirror device enables sinusoidal fringe projection at up to 4.8 kHz. The fringe patterns are captured alternately by two high-speed cameras. A new algorithm, which robustly matches pixels in acquired

    更新日期:2020-11-15
  • Generation of multi-channel chaotic signals with time delay signature concealment and ultrafast photonic decision making based on a globally-coupled semiconductor laser network
    Photonics Res. (IF 6.099) Pub Date : 2020-10-30
    Yanan Han, Shuiying Xiang, Yang Wang, Yuanting Ma, Bo Wang, Aijun Wen, and Yue Hao

    We propose and demonstrate experimentally and numerically a network of three globally coupled semiconductor lasers (SLs) that generate triple-channel chaotic signals with time delayed signature (TDS) concealment. The effects of the coupling strength and bias current on the concealment of the TDS are investigated. The generated chaotic signals are further applied to reinforcement learning, and a parallel

    更新日期:2020-11-15
  • Freestanding metal nanohole array for high-performance applications
    Photonics Res. (IF 6.099) Pub Date : 2020-10-22
    Bobo Du, Yinlan Ruan, Dexing Yang, Peipei Jia, Shoufei Gao, Yingying Wang, Pu Wang, and Heike Ebendorff-Heidepriem

    Plasmonic devices using periodic metallic nanostructures have recently gained tremendous interest for color filters, sensing, surface enhanced spectroscopy, and enhanced photoluminescence, etc. However, the performance of such plasmonic devices is severely hampered by the solid substrates supporting the metallic nanostructures. Here, a strategy for freestanding metallic nanomembranes is introduced

    更新日期:2020-11-15
  • Revealing the intrinsic nonlinear optical response of a single MoS2 nanosheet in a suspension based on spatial self-phase modulation
    Photonics Res. (IF 6.099) Pub Date : 2020-10-22
    Si Xiao, Ying Ma, Yilin He, Yiduo Wang, Hao Xin, Qi Fan, Jingdi Zhang, Xiaohong Li, Yu Zhang, Jun He, and Yingwei Wang

    The reorientation of 2D materials caused by nonlocal electron coherence is the formation mechanism of 2D material spatial self-phase modulation under laser irradiation, which is widely known as the “wind-chime” model. Here, we present a method that provides strong evidence for the reorientation of 2D-material-induced spatial self-phase modulation. The traditional “wind-chime” model was modified by

    更新日期:2020-11-15
  • Nanowire-assisted microcavity in a photonic crystal waveguide and the enabled high-efficiency optical frequency conversions
    Photonics Res. (IF 6.099) Pub Date : 2020-10-22
    Linpeng Gu, Liang Fang, Qingchen Yuan, Xuetao Gan, Hao Yang, Xutao Zhang, Juntao Li, Hanlin Fang, Vladislav Khayrudinov, Harri Lipsanen, Zhipei Sun, and Jianlin Zhao

    We report an indium phosphide nanowire (NW)-induced cavity in a silicon planar photonic crystal (PPC) waveguide to improve the light–NW coupling. The integration of NW shifts the transmission band of the PPC waveguide into the mode gap of the bare waveguide, which gives rise to a microcavity located on the NW section. Resonant modes with Q factors exceeding 103 are obtained. Leveraging on the high

    更新日期:2020-11-15
  • Two-dimensional tin diselenide nanosheets pretreated with an alkaloid for near- and mid-infrared ultrafast photonics
    Photonics Res. (IF 6.099) Pub Date : 2020-10-12
    Zhenhong Wang, Bin Zhang, Bing Hu, Zhongjun Li, Chunyang Ma, Yu Chen, Yufeng Song, Han Zhang, Jun Liu, and Guohui Nie

    Two-dimensional (2D) tin diselenide (SnSe2), a novel layered material with excellent optical and electronic properties, has been extensively investigated in various promising applications, including photodetectors, optical switching, and ultrafast photonics. In this work, SnSe2 nanosheets have been obtained after pretreatment in an alkaloid, exhibiting high optical absorption and electron-enriched

    更新日期:2020-11-15
  • Universal frequency engineering tool for microcavity nonlinear optics: multiple selective mode splitting of whispering-gallery resonances
    Photonics Res. (IF 6.099) Pub Date : 2020-10-12
    Xiyuan Lu, Ashutosh Rao, Gregory Moille, Daron A. Westly, and Kartik Srinivasan

    Whispering-gallery microcavities have been used to realize a variety of efficient parametric nonlinear optical processes through the enhanced light–matter interaction brought about by supporting multiple high quality factor and small modal volume resonances. Critical to such studies is the ability to control the relative frequencies of the cavity modes, so that frequency matching is achieved to satisfy

    更新日期:2020-11-15
  • Upconversion-luminescent hydrogel optical probe for in situ dopamine monitoring
    Photonics Res. (IF 6.099) Pub Date : 2020-10-30
    Bingqian Zhou, Jingjing Guo, Changxi Yang, and Lingjie Kong

    Dopamine (DA), as a neurotransmitter in human brain, plays a crucial role in reward motivation and motor control. An improper level of DA can be associated with neurological disorders such as schizophrenia and Parkinson’s disease. To quantify DA, optical DA sensors have emerged as an attractive platform due to their capability of high-precision and label-free measurement, and immunity to electromagnetic

    更新日期:2020-11-15
  • Efficient emission of InGaN-based light-emitting diodes: toward orange and red
    Photonics Res. (IF 6.099) Pub Date : 2020-10-09
    Shengnan Zhang, Jianli Zhang, Jiangdong Gao, Xiaolan Wang, Changda Zheng, Meng Zhang, Xiaoming Wu, Longquan Xu, Jie Ding, Zhijue Quan, and Fengyi Jiang

    Indium gallium nitride (InGaN)-based light-emitting diodes (LEDs) are considered a promising candidate for red-green-blue (RGB) micro displays. Currently, the blue and green LEDs are efficient, while the red ones are inefficient for such applications. This paper reports our work of creating efficient InGaN-based orange and red LEDs on silicon(111) substrates at low current density. Based on the structure

    更新日期:2020-11-15
  • Modeling the degradation mechanisms of AlGaN-based UV-C LEDs: from injection efficiency to mid-gap state generation
    Photonics Res. (IF 6.099) Pub Date : 2020-10-30
    F. Piva, C. De Santi, M. Deki, M. Kushimoto, H. Amano, H. Tomozawa, N. Shibata, G. Meneghesso, E. Zanoni, and M. Meneghini

    In this work, we analyze and model the effect of a constant current stress on an ultraviolet light-emitting diode with a nominal wavelength of 285 nm. By carrying out electrical, optical, spectral, and steady-state photocapacitance (SSPC) analysis during stress, we demonstrate the presence of two different degradation mechanisms. The first one occurs in the first 1000 min of stress, is ascribed to

    更新日期:2020-11-15
  • Reducing the mode-mismatch noises in atom–light interactions via optimization of the temporal waveform
    Photonics Res. (IF 6.099) Pub Date : 2020-10-14
    Xiaotian Feng, Zhifei Yu, Bing Chen, Shuying Chen, Yuan Wu, Donghui Fan, Chun-Hua Yuan, L. Q. Chen, Z. Y. Ou, and Weiping Zhang

    Atom–light interface is at the core of quantum metrology and quantum information science. Associated noises during interaction processes are always inevitable and adverse. In this paper, we perform the stimulated Raman scattering (SRS) in a hot Rb87 vapor cell and demonstrate the reduction of related noises originated from mode mismatch via optimizing the temporal waveform of the input seed. By using

    更新日期:2020-11-15
  • Hybrid nano-scale Au with ITO structure for a high-performance near-infrared silicon-based photodetector with ultralow dark current
    Photonics Res. (IF 6.099) Pub Date : 2020-10-09
    Xinxin Li, Zhen Deng, Jun Li, Yangfeng Li, Linbao Guo, Yang Jiang, Ziguang Ma, Lu Wang, Chunhua Du, Ying Wang, Qingbo Meng, Haiqiang Jia, Wenxin Wang, Wuming Liu, and Hong Chen

    An internal photoemission-based silicon photodetector detects light below the silicon bandgap at room temperature and can exhibit spectrally broad behavior, making it potentially suited to meet the need for a near-infrared pure Si photodetector. In this work, the implementation of a thin Au insertion layer into an ITO/n-Si Schottky photodetector can profoundly affect the barrier height and significantly

    更新日期:2020-11-15
  • 800 Gbit/s transmission over 1 km single-mode fiber using a four-channel silicon photonic transmitter
    Photonics Res. (IF 6.099) Pub Date : 2020-10-26
    Hongguang Zhang, Miaofeng Li, Yuguang Zhang, Di Zhang, Qiwen Liao, Jian He, Shenglei Hu, Bo Zhang, Lei Wang, Xi Xiao, Nan Qi, and Shaohua Yu

    We demonstrate the optical transmission of an 800 Gbit/s (4×200 Gbit/s) pulse amplitude modulation-4 (PAM-4) signal and a 480 Gbit/s (4×120 Gbit/s) on–off-keying (OOK) signal by using a high-bandwidth (BW) silicon photonic (SiP) transmitter with the aid of digital signal processing (DSP). In this transmitter, a four-channel SiP modulator chip is co-packaged with a four-channel driver chip, with a measured

    更新日期:2020-11-15
  • All-metallic metasurfaces towards high-performance magneto-plasmonic sensing devices
    Photonics Res. (IF 6.099) Pub Date : 2020-10-22
    Lixia Li, Xueyang Zong, and Yufang Liu

    Magneto-plasmonic sensors based on surface plasmon resonance have been studied considerably in recent years, as they feature high sensitivity and ultrahigh resolution. However, the majority of such investigations focus on prism-based sandwich architectures that not only impede the miniaturization of devices but also have a weak transverse magneto-optical Kerr effect (TMOKE) in magnitude. Herein, we

    更新日期:2020-11-15
  • Coupled quantum molecular cavity optomechanics with surface plasmon enhancement: comment
    Photonics Res. (IF 6.099) Pub Date : 2020-10-26
    Seyed Mahmoud Ashrafi, Narjes Taghadomi, Alireza Bahrampour, and Rasoul Malekfar

    We have found an incorrect formula to estimate the root mean square (rms) amplitude of the molecular vibration in the molecular optomechanics systems reported by J. Liu et al. [Photon. Res. 5, 450–456 (2017) [CrossRef] ]. In contrast with common optomechanical systems, the equilibrium position for molecular optomechanics systems used in the letter cannot be achieved by the equipartition theorem. Here

    更新日期:2020-11-15
  • Two-step solvent post-treatment on PTAA for highly efficient and stable inverted perovskite solar cells
    Photonics Res. (IF 6.099) Pub Date : 2020-09-18
    Yang Li, Chao Liang, Gaopeng Wang, Jielei Li, Shi Chen, Shihe Yang, Guichuan Xing, and Hui Pan

    Modifying the surface of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) with toluene during the high-speed spin-coating process of dimethylformamide considerably improves the wettability and morphology of PTAA and results in improvement of the crystallinity and absorption of perovskite film. The hole mobility and ohm contact have also been improved accordingly. Combined with these improved

    更新日期:2020-10-02
  • Exciton binding energy and effective mass of CsPbCl3: a magneto-optical study
    Photonics Res. (IF 6.099) Pub Date : 2020-09-25
    Michal Baranowski, Paulina Plochocka, Rui Su, Laurent Legrand, Thierry Barisien, Frederick Bernardot, Qihura Xiong, Christophe Testelin, and Maria Chamarro

    High magnetic field spectroscopy has been performed on lead chloride-based perovskite, a material that attracts significant interest for photovoltaic and photonic applications within the past decades. Optical properties being mainly driven by the exciton states, we have measured the fundamental parameters, such as the exciton binding energy, effective mass, and dielectric constant. Among the inorganic

    更新日期:2020-10-02
  • Disorder-protected quantum state transmission through helical coupled-resonator waveguides
    Photonics Res. (IF 6.099) Pub Date : 2020-09-28
    JungYun Han, Andrey A. Sukhorukov, and Daniel Leykam

    We predict the preservation of temporal indistinguishability of photons propagating through helical coupled-resonator optical waveguides (H-CROWs). H-CROWs exhibit a pseudospin-momentum locked dispersion, which we show suppresses on-site disorder-induced backscattering and group velocity fluctuations. We simulate numerically the propagation of two-photon wave packets, demonstrating that they exhibit

    更新日期:2020-10-02
  • High absorption large-mode area step-index fiber for tandem-pumped high-brightness high-power lasers
    Photonics Res. (IF 6.099) Pub Date : 2020-09-22
    Kang-Jie Lim, Samuel Kai-Wen Seah, Joash Yong’En Ye, Wendy Weiying Lim, Chu-Perng Seah, Yunn-Boon Tan, Suting Tan, Huiting Lim, Raghuraman Sidharthan, Arumugam Rajendra Prasadh, Chen-Jian Chang, Seongwoo Yoo, and Song-Liang Chua

    A short absorption length ytterbium (Yb)-doped large-mode area (LMA) fiber is presented as a step forward to mitigate the stern problem of nonlinear scatterings in a tandem pumping scheme adopted for high-power fiber laser. The short absorption length was realized by incorporating high Yb concentration in the fiber core. Furthermore, by replacing the inherent silica cladding with a Ge-doped cladding

    更新日期:2020-10-02
  • Learning-based phase imaging using a low-bit-depth pattern
    Photonics Res. (IF 6.099) Pub Date : 2020-09-28
    Zhenyu Zhou, Jun Xia, Jun Wu, Chenliang Chang, Xi Ye, Shuguang Li, Bintao Du, Hao Zhang, and Guodong Tong

    Phase imaging always deals with the problem of phase invisibility when capturing objects with existing light sensors. However, there is a demand for multiplane full intensity measurements and iterative propagation process or reliance on reference in most conventional approaches. In this paper, we present an end-to-end compressible phase imaging method based on deep neural networks, which can implement

    更新日期:2020-10-02
  • Design and analysis of extended depth of focus metalenses for achromatic computational imaging
    Photonics Res. (IF 6.099) Pub Date : 2020-09-25
    Luocheng Huang, James Whitehead, Shane Colburn, and Arka Majumdar

    Metasurface optics have demonstrated vast potential for implementing traditional optical components in an ultracompact and lightweight form factor. Metasurfaces, however, suffer from severe chromatic aberrations, posing serious limitations on their practical use. Existing approaches for circumventing this involving dispersion engineering are limited to small apertures and often entail multiple scatterers

    更新日期:2020-10-02
  • High-gain waveguide amplifiers in Si3N4 technology via double-layer monolithic integration
    Photonics Res. (IF 6.099) Pub Date : 2020-09-28
    Jinfeng Mu, Meindert Dijkstra, Jeroen Korterik, Herman Offerhaus, and Sonia M. García-Blanco

    Silicon nitride (Si3N4)-on-SiO2 attracts increasing interest in integrated photonics owing to its low propagation loss and wide transparency window, extending from ∼400 nm to 2350 nm. Scalable integration of active devices such as amplifiers and lasers on the Si3N4 platform will enable applications requiring optical gain and a much-needed alternative to hybrid integration, which suffers from high cost

    更新日期:2020-10-02
  • Breathing dissipative soliton explosions in a bidirectional ultrafast fiber laser
    Photonics Res. (IF 6.099) Pub Date : 2020-09-15
    Yi Zhou, Yu-Xuan Ren, Jiawei Shi, and Kenneth K. Y. Wong

    Soliton explosions, among the most exotic dynamics, have been extensively studied on parameter invariant stationary solitons. However, the explosion dynamics are still largely unexplored in breathing dissipative solitons as a dynamic solution to many nonlinear systems. Here, we report on the first observation of a breathing dissipative soliton explosion in a net-normal-dispersion bidirectional ultrafast

    更新日期:2020-10-02
  • Extraction of internal phase motions in femtosecond soliton molecules using an orbital-angular-momentum-resolved method
    Photonics Res. (IF 6.099) Pub Date : 2020-09-18
    Yuwei Zhao, Jintao Fan, Youjian Song, Uwe Morgner, and Minglie Hu

    Internal motions in femtosecond soliton molecules provide insight into universal collective dynamics in various nonlinear systems. Here we introduce an orbital-angular-momentum (OAM)-resolved method that maps the relative phase motion within a femtosecond soliton molecule into the rotational movement of the interferometric beam profile of two optical vortices. By this means, long-term relative phase

    更新日期:2020-10-02
  • Fast and wide-band tuning single-mode microlaser based on fiber Fabry–Pérot microcavities
    Photonics Res. (IF 6.099) Pub Date : 2020-09-29
    Xin-Xia Gao, Jin-Ming Cui, Zhi-Hao Hu, Chun-Hua Dong, Jian Wang, Yun-Feng Huang, Chuan-Feng Li, and Guang-Can Guo

    A narrow-linewidth laser operating at the telecommunications band combined with both fast and wide-band tuning features will have promising applications. Here we demonstrate a single-mode (both transverse and longitudinal mode) continuous microlaser around 1535 nm based on a fiber Fabry–Pérot microcavity, which achieves wide-band tuning without mode hopping to the 1.3 THz range and fast tuning rate

    更新日期:2020-10-02
  • Design of a multichannel photonic crystal dielectric laser accelerator
    Photonics Res. (IF 6.099) Pub Date : 2020-09-21
    Zhexin Zhao, Dylan S. Black, R. Joel England, Tyler W. Hughes, Yu Miao, Olav Solgaard, Robert L. Byer, and Shanhui Fan

    To be useful for most scientific and medical applications, compact particle accelerators will require much higher average current than enabled by current architectures. For this purpose, we propose a photonic crystal architecture for a dielectric laser accelerator, referred to as a multi-input multi-output silicon accelerator (MIMOSA), that enables simultaneous acceleration of multiple electron beams

    更新日期:2020-10-02
  • Room temperature synthesis of stable silica-coated CsPbBr3 quantum dots for amplified spontaneous emission
    Photonics Res. (IF 6.099) Pub Date : 2020-09-22
    Qionghua Mo, Tongchao Shi, Wensi Cai, Shuangyi Zhao, Dongdong Yan, Juan Du, and Zhigang Zang

    All-inorganic cesium lead bromide (CsPbBr3) perovskite quantum dots (QDs) with excellent optical properties have been regarded as good gain materials for amplified spontaneous emission (ASE). However, the poor stability as the results of the high sensitivity to heat and moisture limits their further applications. Here, we report a facile one-pot approach to synthesize CsPbBr3@SiO2 QDs at room temperature

    更新日期:2020-10-02
  • Flexible microbubble-based Fabry–Pérot cavity for sensitive ultrasound detection and wide-view photoacoustic imaging
    Photonics Res. (IF 6.099) Pub Date : 2020-09-10
    Jun Ma, Yang He, Xue Bai, Li-Peng Sun, Kai Chen, Kyunghwan Oh, and Bai-Ou Guan

    Interaction of acoustic waves and microbubbles occurs in numerous biomedical applications including ultrasound imaging, drug delivery, lithotripsy treatment, and cell manipulation, wherein the acoustically driven microbubbles routinely act as active microscale oscillators or actuators. In contrast, microbubbles were utilized here as passive receivers to detect broadband ultrasound waves in aqueous

    更新日期:2020-10-02
  • Quantum-enhanced stochastic phase estimation with the SU(1,1) interferometer
    Photonics Res. (IF 6.099) Pub Date : 2020-09-29
    Kaimin Zheng, Minghao Mi, Ben Wang, Liang Xu, Liyun Hu, Shengshuai Liu, Yanbo Lou, Jietai Jing, and Lijian Zhang

    Quantum stochastic phase estimation has many applications in the precise measurement of various physical parameters. Similar to the estimation of a constant phase, there is a standard quantum limit for stochastic phase estimation, which can be obtained with the Mach–Zehnder interferometer and coherent input state. Recently, it has been shown that the stochastic standard quantum limit can be surpassed

    更新日期:2020-10-02
  • Widely tunable, heterogeneously integrated quantum-dot O-band lasers on silicon
    Photonics Res. (IF 6.099) Pub Date : 2020-09-10
    Aditya Malik, Joel Guo, Minh A. Tran, Geza Kurczveil, Di Liang, and John E. Bowers

    Heterogeneously integrated lasers in the O-band are a key component in realizing low-power optical interconnects for data centers and high-performance computing. Quantum-dot-based materials have been particularly appealing for light generation due to their ultralow lasing thresholds, small linewidth enhancement factor, and low sensitivity to reflections. Here, we present widely tunable quantum-dot

    更新日期:2020-10-02
  • 56 Gbps high-speed Ge electro-absorption modulator
    Photonics Res. (IF 6.099) Pub Date : 2020-09-29
    Zhi Liu, Xiuli Li, Chaoqun Niu, Jun Zheng, Chunlai Xue, Yuhua Zuo, and Buwen Cheng

    A high-speed evanescent-coupled Ge waveguide electro-absorption modulator (EAM) with simple fabrication processes was realized on a silicon-on-insulator platform with a 220 nm top Si layer. Selectively grown Ge with a triangle shape was directly used for Ge waveguides of the EAM. An asymmetric p-i-n junction was designed in the Ge waveguide to provide a strong electric field for Franz–Keldysh effect

    更新日期:2020-10-02
  • Strong optical force of a molecule enabled by the plasmonic nanogap hot spot in a tip-enhanced Raman spectroscopy system
    Photonics Res. (IF 6.099) Pub Date : 2020-09-18
    Li Long, Jianfeng Chen, Huakang Yu, and Zhi-Yuan Li

    Tip-enhanced Raman spectroscopy (TERS) offers a powerful means to enhance the Raman scattering signal of a molecule as the localized surface plasmonic resonance will induce a significant local electric field enhancement in the nanoscale hot spot located within the nanogap of the TERS system. In this work, we theoretically show that this nanoscale hot spot can also serve as powerful optical tweezers

    更新日期:2020-10-02
  • Influence of mixed organic cations on the nonlinear optical properties of lead tri-iodide perovskites
    Photonics Res. (IF 6.099) Pub Date : 2020-08-17
    Xuanyu Zhang, Shuyu Xiao, Ruxue Li, Tingchao He, Guichuan Xing, and Rui Chen

    Metal halide perovskite materials have been widely studied recently due to their excellent optoelectronic properties. Among these materials, organic-inorganic hybrid perovskites have attracted much attention because of their relatively soft framework, which makes them more suitable for nonlinear optical (NLO) applications. However, there is rare physical mechanism study on the coexistence of two-photon

    更新日期:2020-09-02
  • Mode selection and high-quality upconversion lasing from perovskite CsPb2Br5 microplates
    Photonics Res. (IF 6.099) Pub Date : 2020-09-01
    Zhengzheng Liu, Chunwei Wang, Zhiping Hu, Juan Du, Jie Yang, Zeyu Zhang, Tongchao Shi, Weimin Liu, Xiaosheng Tang, and Yuxin Leng

    In recent years, halide perovskite nanostructures have had great advances and have opened up a bright future for micro/nanolasers. However, upconversion lasing by two-photon excitation with mode selection and high quality factor in one device is still rarely reported. Herein, two lasing modes are demonstrated in the all-inorganic perovskite CsPb2Br5 microplates with subwavelength thickness and uniform

    更新日期:2020-09-02
  • Topological photonic crystal of large valley Chern numbers
    Photonics Res. (IF 6.099) Pub Date : 2020-08-14
    Xiang Xi, Kang-Ping Ye, and Rui-Xin Wu

    The recent realizations of a topological valley phase in a photonic crystal, an analog of gapped valleytronic materials in an electronic system, are limited to the valley Chern number of one. In this paper, we present a type of valley phase that can have a large valley Chern number of two or three. The valley phase transitions between the different valley Chern numbers (from one to three) are realized

    更新日期:2020-09-02
  • Creating locally interacting Hamiltonians in the synthetic frequency dimension for photons
    Photonics Res. (IF 6.099) Pub Date : 2020-08-27
    Luqi Yuan, Avik Dutt, Mingpu Qin, Shanhui Fan, and Xianfeng Chen

    The recent emerging field of synthetic dimension in photonics offers a variety of opportunities for manipulating different internal degrees of freedom of photons such as the spectrum of light. While nonlinear optical effects can be incorporated into these photonic systems with synthetic dimensions, these nonlinear effects typically result in long-range interactions along the frequency axis. Thus, it

    更新日期:2020-09-02
  • Review of exceptional point-based sensors
    Photonics Res. (IF 6.099) Pub Date : 2020-08-18
    Jan Wiersig

    Exceptional points are spectral singularities in open quantum and wave systems that exhibit a strong spectral response to perturbations. This feature can be exploited for a new generation of sensors. This paper explains the basic mechanism and comprehensively reviews the recent developments. In particular, it highlights the influence of classical noise and fundamental limitations due to quantum noise

    更新日期:2020-09-02
  • Synchronous nanoscale topographic and chemical mapping by differential-confocal controlled Raman microscopy
    Photonics Res. (IF 6.099) Pub Date : 2020-08-14
    Han Cui, Yun Wang, Lirong Qiu, Shucheng Li, Jonathan M. Cooper, and Weiqian Zhao

    Confocal Raman microscopy is currently used for label-free optical sensing and imaging within the biological, engineering, and physical sciences as well as in industry. However, currently these methods have limitations, including their low spatial resolution and poor focus stability, that restrict the breadth of new applications. This paper now introduces differential-confocal controlled Raman microscopy

    更新日期:2020-09-02
  • Broadband quasi-phase-matching in dispersion-engineered all-optically poled silicon nitride waveguides
    Photonics Res. (IF 6.099) Pub Date : 2020-08-20
    Edgars Nitiss, Boris Zabelich, Ozan Yakar, Junqiu Liu, Rui Ning Wang, Tobias J. Kippenberg, and Camille-Sophie Brès

    Quasi-phase-matching (QPM) has become one of the most common approaches for increasing the efficiency of nonlinear three-wave mixing processes in integrated photonic circuits. Here, we provide a study of dispersion engineering of QPM second-harmonic (SH) generation in stoichiometric silicon nitride (Si3N4) waveguides. We apply waveguide design and lithographic control in combination with the all-optical

    更新日期:2020-09-02
  • Chalcogenide glass photonic integration for improved 2 μm optical interconnection
    Photonics Res. (IF 6.099) Pub Date : 2020-08-21
    Weihong Shen, Pingyang Zeng, Zelin Yang, Di Xia, Jiangbing Du, Bin Zhang, Ke Xu, Zuyuan He, and Zhaohui Li

    In this work, on-chip chalcogenide glass photonic integrations with several fundamental photonic building blocks are designed and fabricated based on the As2S3 platform for improved 2 μm optical interconnection, achieving a broadened wavelength bandwidth and improved fabrication tolerance. A 600 nm thick As2S3 strip waveguide has low propagation loss of 1.447 dB/cm at 2 μm. Broadband vertical coupling

    更新日期:2020-09-02
  • Towards the integration of nanoemitters by direct laser writing on optical glass waveguides
    Photonics Res. (IF 6.099) Pub Date : 2020-09-01
    Xiaolun Xu, Aurélie Broussier, Tiziana Ritacco, Mackrine Nahra, Fabien Geoffray, Ali Issa, Safi Jradi, Renaud Bachelot, Christophe Couteau, and Sylvain Blaize

    A major challenge towards nanophotonics is the integration of nanoemitters on optical chips. Combining the optical properties of nanoemitters with the benefits of integration and scalability of integrated optics is still a major issue to overcome. In this work, we demonstrate the integration of nanoemitters positioned in a controlled manner onto a substrate and onto an optical ion-exchanged glass waveguide

    更新日期:2020-09-02
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