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Mid-infrared silicon photonic waveguides and devices [Invited]

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Photonics Research 2018年第4期6卷 254-276页

作者： YI ZOU swapnajit chakravarty CHI-JUI CHUNG XIAOCHUAN XU RAY T.CHEN School of Information Science and Technology Shanghai Tech University Microelectronic Research Center Department of Electrical and Computer Engineering University of TexasAustin Omega Optics Inc.

Silicon has been the material of choice of the photonics industry over the last decade due to its easy integration with silicon electronics, high index contrast, small footprint, and low cost, as well as its optical transparency in the nearinfrared and parts of mid-infrared(MIR) wavelengths(from 1.1 to 8 μm). While considerations of micro-and nano-fabrication-induced device parameter deviations and a higher-than-desirable propagation loss still serve as a bottleneck in many on-chip data communication applications, applications as sensors do not require similar stringent controls. Photonic devices on chips are increasingly being demonstrated for chemical and biological sensing with performance metrics rivaling benchtop instruments and thus promising the potential of portable, handheld,and wearable monitoring of various chemical and biological analytes. In this paper, we review recent advances in MIR silicon photonics research. We discuss the pros and cons of various platforms, the fabrication procedures for building such platforms, and the benchmarks demonstrated so far, together with their applications. Novel device architectures and improved fabrication techniques have paved a viable way for realizing low-cost, high-density,multi-function integrated devices in the MIR. These advances are expected to benefit several application domains in the years to come, including communication networks, sensing, and nonlinear systems.

关键词：光电子产业硅电子发展现状通讯技术

Review of design principles of 2D photonic crystal microcavity biosensors in silicon and their applications

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Frontiers of Optoelectronics 2016年第2期9卷 206-224页

作者： swapnajit chakravarty Xiangning CHEN Naimei TANG Wei-Cheng LAI Yi ZOU Hai WAN Ray T. CHEN Omega Optics Inc. Austin TX 78757 USA Department of Electrical and Computer Engineering University of Texas at Austin Austin TX 78712 USA School of Electronic Science and Engineering Nanjing University Nanjing 210093 China

In this paper, we reviewed the design principles of two-dimensional （2D） silicon photonic crystal microcavity （PCM） biosensors coupled to photonie crystal waveguides （PCWs）. Microcavity radiation loss is con- trolled by engineered the cavity mode volume. Coupling loss into the waveguide is controlled by adjusting the position of the microcavity from the waveguide. We also investigated the dependence of analyte overlap integral （also called fill fraction） of the resonant mode as well as the effect of group index of the coupling waveguide at the resonant wavelength of the microcavity. In addition to the cavity properties, absorbance of the sensing medium or analyte together with the affinity constant of the probe and target biomarkers involved in the biochemical reaction also limits the minimum detection limits. We summarized our results in applications in cancer biomarker detection, heavy metal sensing and therapeutic drug monitoring.

关键词： photonic crystal (PC) sensor biosensor slowlight photonic crystal microcavity (PCM) photonic crystalwaveguide (PCW) high sensitivity high specificity,photonic integrated circuits (PICs) nanophotonics

Silicon nonlinear switch as a conditional circulator for monostatic LiDAR systems

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Photonics Research 2022年第2期10卷 426-432页

作者： Mingfei Ding Yiwei Xie Hao Yan Abu Naim R.Ahmed Reza Safian swapnajit chakravarty Leimeng Zhuang Pengcheng Jiao Huan Li Liu Liu Daoxin Dai Centre for Optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationZhejiang Provincial Key Laboratory for Sensing TechnologiesZhejiang UniversityZijingang CampusHangzhou 310058China Ningbo Research Institute Zhejiang UniversityNingbo 315100China imec USA Nanoelectronics Design CenterInc.KissimmeeFlorida 34744USA Ocean College Zhejiang UniversityZhoushan 316021China

All-optical silicon-photonics-based LiDAR systems allow for desirable features in scanning resolution and speed,as well as leverage other advantages such as size, weight, and cost. Implementing optical circulators in silicon photonics enables bidirectional use of the light path for both transmitters and receivers, which simplifies the system configuration and thereby promises low system cost. In this work, to the best of our knowledge, we present the first experimental verification of all-passive silicon photonics conditional circulators for monostatic LiDAR systems using a nonlinear switch. The proposed silicon nonlinear interferometer is realized by controlling signal power distribution with power-splitting circuits, allowing the LiDAR transmitter and receiver to share the same optical path. Unlike the traditional concept requiring a permanent magnet, the present device is implemented by using common silicon photonic waveguides and a standard foundry-compatible fabrication process. With several additional phase shifters, the demonstrated device exhibits considerable flexibility using a single chip, which can be more attractive for integration with photodetector arrays in LiDAR systems.

关键词： interferometer LiDAR nonlinear