Article
Optics
Chad Ropp, Wenqi Zhu, Alexander Yulaev, Daron Westly, Gregory Simelgor, Akash Rakholia, William Lunden, Dan Sheredy, Martin M. Boyd, Scott Papp, Amit Agrawal, Vladimir Aksyuk
Summary: The commercialization of atomic technologies requires compact and manufacturable optical platforms. This work combines integrated photonics and metasurface optics to create a compact strontium atomic clock. The design includes twelve beams and two co-propagating beams, allowing scalability to an arbitrary number of beams.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Mohamed H. A. Elsawaf, Amr M. E. Safwat
Summary: This article introduces novel wideband fully differential hybrid and rat-race couplers based on the design methodology of multimode star junction. By utilizing the even and odd modes of slotted-microstrip sections, the couplers achieve compact equivalent transmission lines with wideband performance and high CMRR. Experimental results confirm the theoretical predictions, showing excellent performance of the proposed couplers.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Optics
Yisu Yang, Hao Zhao, Xiaomin Ren, Yongqing Huang
Summary: The study introduces a multilayer silicon nitride-on-silicon photonic integrated circuit platform with a monolithic laser at the C-band. The platform features a tapered edge coupler and a meta-structure-based interlayer directional coupler for low-loss broadband laser-to-chip 3D coupling. Optimization of the coupling length and gap between different SiN layers resulted in a large optical operation bandwidth and low coupling loss.
Article
Optics
Saneyuki Suyama, Toshihiko Baba
Summary: In this study, a high-efficiency slow-light grating (SLG) was developed, which selectively radiates upward. Experimentally, the emissivity was enhanced by 2-4 dB, and the roundtrip efficiency was improved by 5.4 dB. This has significant implications for light detection and ranging applications.
Article
Optics
Donald Witt, Jeff Young, Lukas Chrostowski
Summary: In this paper, we propose a fab-in-the-loop reinforcement learning algorithm that takes into account the imperfections in nanofabrication processes for designing nano-photonic components. This algorithm significantly reduces the insertion loss and achieves low loss at the lowest point of the designed bandwidth.
Article
Materials Science, Multidisciplinary
Zhen Liu, Mohamed A. Ettabib, James S. Wilkinson, Michalis N. Zervas
Summary: An analytical theoretical model is developed for practical deep gratings, allowing the calculation of grating-assisted input coupling efficiency. The model considers reciprocal out-coupling problem and models the deep grating structure as an optical layer filled with polarization dipole sources. The scattered fields are calculated using Green's functions, taking into account multiple reflections and interference from adjacent layers.
RESULTS IN PHYSICS
(2023)
Article
Optics
Hongqiang Li, Mengwei Cao, Lu Cao, Feng Ren, Yang Liu, Lizhen Zhang, Liying Chen, Yingjie Wang, Ruina Zhao, Zhenya Song, Zhilin Lin, Shanshan Zhang, Jinjun Bai, Enbang Li, Joan Daniel Prades
Summary: The grating couplers utilize light diffraction to achieve vertical coupling between waveguides and optical fibers. In this study, SU-8 or polymethyl methacrylate (PMMA) polymer materials were used as the waveguide core layer and polydimethylsiloxane (PDMS) as the cladding layer for the fabrication of both uniform and convergent grating couplers. Various parameters such as waveguide layer thickness, etching depth, and grating period were investigated to study their effects on the performance of grating coupling. The experimental results showed that the coupling efficiency and bandwidth of the grating couplers were influenced by the material and geometry parameters.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Junqin Zhang, Ci Zhang, Guoxian Liang, Yintang Yang
Summary: A unidirectional vertical coupling structure based on optical TSVs and gratings is proposed for efficient optical interconnects in 3D optoelectronic integrated circuits. The structure achieves high coupling efficiency through the use of a mirror and a DBR, suitable for high-speed vertical optical data transmission over short distances.
OPTICS COMMUNICATIONS
(2021)
Article
Physics, Applied
Ilia M. Fradkin, Andrey A. Demenev, Vladimir D. Kulakovskii, Vladimir N. Antonov, Nikolay A. Gippius
Summary: The study demonstrates the successful coupling of oppositely propagating guided modes to circularly polarized light beams of different handedness by arranging plasmonic nanoparticles onto a dielectric waveguide. The results suggest that the structure can serve as a circular-polarization-controlled grating coupler, making it a potential efficient coupling interface for integrated devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Weicheng Chen, Dian Wan, Qi He, Jiaqi Wang, Haofeng Hu, Tiegen Liu, Hon Ki Tsang, Zhenzhou Cheng
Summary: Short-wavelength mid-infrared (MIR) silicon photonics has various applications in optical communications, chemical analysis, and environmental monitoring. In this study, a relaxed-tolerance subwavelength grating (SWG) coupler design with dual-hole structures was demonstrated to overcome fabrication variations and improve reproducibility. The relaxed-tolerance SWG coupler achieved a peak coupling efficiency of -6.2 dB at a wavelength of 2.038 μm with a 1-dB bandwidth of about 30 nm.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Sunil Kumar, Swapan Kumar Ghorai, Somnath Sengupta
Summary: This article proposes a Fiber Bragg Grating (FBG) peak detection method using the edge-filtering technique and a Long Period Grating (LPG)-modulated light source. The LPG with low loss-band and linear intensity variation within a certain wavelength range is chosen. The broadband light source is passed through the LPG and split using a 3 dB coupler. The modulated light is fed separately to two FBG using Y-couplers. The reflected lights from FBG are measured using an optical power meter. The proposed method is simple, dynamic, and cost-effective, and has been experimentally implemented for strain and temperature measurement with corresponding sensitivities of 1.01 pm/με and 9.8 pm/℃.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Instruments & Instrumentation
Yi Zhou, Yan-zhao Xie, Dao-zhong Zhang
Summary: A high-efficiency wideband PCI coupler is proposed in this paper to address the challenge of inadequate disturbance injection in PCI tests. By enhancing inductive and capacitive coupling, the coupler has shown improved performance over the frequency range of interest for PCI tests, as validated experimentally.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Optics
Xingyu Wu, Yang Qiu, Shaonan Zheng, Xingyan Zhao, Yuan Dong, Qize Zhong, Lianxi Jia, Ting Hu
Summary: We propose a vertical coupling scheme using metasurface deflectors and grating couplers. The genetic algorithm is used to optimize the grating couplers based on Gaussian fitting. An amorphous silicon-based meta-deflector is designed to achieve optimal coupling angle for high coupling efficiency. Simulations predict a peak vertical coupling efficiency of 78% at 2 μm wavelength, with a 1 dB bandwidth of at least 35 nm. The design process of grating couplers and meta-deflector is detailed, and the impact of fabrication error on coupling efficiency is analyzed.
Article
Optics
Joe A. Smith, Jorge Monroy-Ruz, Pisu Jiang, John G. Rarity, Krishna C. Balram
Summary: This paper addresses the performance issues of grating couplers on moderate index contrast platforms at visible wavelengths. Two approaches, a dielectric grating and an embedded metal grating, are proposed to improve the overall output intensity and reduce the on-chip footprint. Experimental results demonstrate the potential of these methods for compact and efficient visible wavelength photonic interconnects, particularly in cryogenic deployment for quantum photonics.
Article
Engineering, Electrical & Electronic
Haoyang Tan, Baobao Chen, Yi Zhao, Shiming Gao, Xiaowei Guan
Summary: In this study, a unidirectional dual-wavelength-band grating coupler with one-dimensional subwavelength structures is proposed and experimentally demonstrated. It achieves efficient fiber-chip coupling simultaneously in the O-band and the L-band, with peak coupling efficiencies of 19.7% and 19.5% and 3-dB bandwidths of 27 and 38-nm, respectively.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Xu Wang, Feng Zhou, Dingshan Gao, Yanxian Wei, Xi Xiao, Shaohua Yu, Jianji Dong, Xinliang Zhang
PHOTONICS RESEARCH
(2019)
Article
Physics, Applied
Jianqi You, Guoqing You, Shuyi Li, Jin Hou, Chunyong Yang, Shaoping Chen, Dingshan Gao
APPLIED PHYSICS EXPRESS
(2020)
Article
Physics, Multidisciplinary
Qingjie Liu, Shuyi Li, Bing Wang, Shaolin Ke, Chengzhi Qin, Kai Wang, Weiwei Liu, Dingshan Gao, Pierre Berini, Peixiang Lu
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
Shuyi Li, Lifeng Cai, Dingshan Gao, Jianji Dong, Jin Hou, Chunyong Yang, Shaoping Chen, Xinliang Zhang
PHOTONICS RESEARCH
(2020)
Review
Developmental Biology
Kun Qin, Shaoye Xu, Yu Han, Songhao Wang, Jianguo Yan, Xiaoyun Shao
Summary: This article reviews the recent literature on the biological characteristics and mechanisms of CRMPs in different neurodegenerative diseases.
DEVELOPMENTAL NEUROSCIENCE
(2022)
Article
Optics
Lifeng Cai, Dingshan Gao, Jianji Dong, Jin Hou, Chunyong Yang, Shaoping Chen, Xinliang Zhang
Summary: In this paper, a compact silicon-based multimode ring resonator with high Q-factors for the three lowest TE modes is designed. The mode loss and inter-mode crosstalk are suppressed using a multimode waveguide bend and directional couplers. The device is fabricated using a simple one-step lithography process.
Article
Cardiac & Cardiovascular Systems
Zhaoshui Li, Yanjie Song, Meng Wang, Ruxin Shen, Kun Qin, Yu Zhang, Ting Jiang, Yifan Chi
Summary: This study reveals the crucial roles of m6A modification in immune microenvironment regulation in coronary heart disease (CHD), identifying significant genes and hub genes associated with CHD. The findings provide insights into the impact of m6A modification on the diversity and complexity of the immune microenvironment in CHD.
FRONTIERS IN CARDIOVASCULAR MEDICINE
(2022)
Article
Dermatology
Lei Yu, Kun Qin, Xianming Deng, Xiaojian Yao, Yuhong Deng, Wanying He, Qi-Wen Liu, Yichun Tang, Hong Yang, Zhengyuan Wang, Zhaohua Zhu, Tangde Zhang
Summary: This study investigated the incidence and potential risk factors of capillary malformation (CM) in Chinese infants. The results showed that the incidences of salmon patches and port-wine stains were 9.10% and 0.80%, respectively. Male sex and birth hypoxia were risk factors for salmon patches, while birth hypoxia and pregnancy-induced hypertension syndrome were associated with a higher risk of port-wine stains.
JOURNAL OF THE EUROPEAN ACADEMY OF DERMATOLOGY AND VENEREOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Hui Wang, Xin Cong, Kun Qin, Mengke Yan, Xianfeng Xu, Mingkang Liu, Xiao Xu, Yue Zhang, Qingyu Gao, Shuiyuan Cheng, Jiangchao Zhao, Huiling Zhu, Yulan Liu
Summary: This study investigated the effects of Cardamine violifolia (SEC) on laying performance and ovarian antioxidant capacity in aging laying hens. The results showed that supplementation with SEC improved laying rate, egg quality, and ovarian antioxidant capacity, exerting an antioxidant function through the modulation of the Nrf2/Keap1 signaling pathway.
Article
Physics, Applied
Zhihua Deng, Dingshan Gao, Jianji Dong, Xinliang Zhang
Summary: In this work, loss-modulated photonic topological edge states in anti-parity-time-symmetric waveguide arrays are experimentally demonstrated. Loss is introduced through carefully designed subwavelength grating (SWG) waveguides, allowing for on-chip control of topological responses. The results show that loss induces topological phase transition and enhances topological responses, providing a platform for exploring non-Hermiticity-induced photonic topological responses and applications.
PHYSICAL REVIEW APPLIED
(2023)
Meeting Abstract
Neurosciences
Du Lei, Kun Qin, Ziyu Zhu, Maxwell Tallman, Thomas Blom, Jeffrey Welge, L. Rodrigo Patino, John A. Sweeney, Melissa DelBello, Robert McNamara
NEUROPSYCHOPHARMACOLOGY
(2022)
Meeting Abstract
Neurosciences
Kun Qin, Du Lei, Ziyu Zhu, Maxwell Tallman, Thomas Blom, Jeffrey Welge, L. Rodrigo Patino, John Sweeney, Robert McNamara, Melissa DelBello
NEUROPSYCHOPHARMACOLOGY
(2022)
Meeting Abstract
Neurosciences
Ziyu Zhu, Du Lei, Kun Qin, Maxwell Tallman, L. Rodrigo Patino, John A. Sweeney, Melissa DelBello, Robert McNamara
NEUROPSYCHOPHARMACOLOGY
(2022)
Article
Physics, Multidisciplinary
Zhihua Deng, Xiujuan Zhang, Dingshan Gao, Ming-Hui Lu, Xinliang Zhang
Summary: The study proposes a scheme for the deterministic generation of multiple topological corner states based on an extremely expanded coupling condition. An equilateral triangular cavity consisting of nontrivial unit cells in triangular PCs is constructed, where all three topological corner states can exist robustly.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Shuyi Li, Lifeng Cai, Dingshan Gao, Jianji Dong, Jin Hou, Chunyong Yang, Shaoping Chen, Xinliang Zhang
