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1992 International Conference on Lasers and Optoelectronics(ICLOE’92)

作者： Colleen Fitzpatrick electro optic consulting services

As neuroprostheses are reduced in size,and as they are implanted in younger individuals with increasing life expectancies,the demands on the biomaterials used to protect them from the hostile extracellular environment are ***,implantable electronic packages must meet stringent quality assurance specifications,which dictate that both gross(～10 atm cc/sec) and fine(～10 atm cc/sec) leak testing must be performed on even very delicate *** such devices,Van der Lugt optical Correlation(VLOC) Techniques offer the potential of superseding conventional leak testing methodologies, in that working with light is cleaner,faster,more sensitive,and eliminates the disadvantages of tracer gas introduced through backfilling or "bombing".This paper will briefly present VLOC techniques,coupled with a discussion of basic leak *** ability of the method to detect and to estimate the size of leaks down to 10 atm cc/sec will be demonstrated,and a comparison will be made between VLOC techniques and conventional helium leak testing methodology in terms or accuracy,speed,efficiency,and total cost.

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Nonvolatile waveguide transmission tuning with electrically-driven ultra-small GST phase-change material

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Science Bulletin 2019年第11期64卷 782-789页

作者： Hanyu Zhang Linjie Zhou Jian Xu Ningning Wang Hao Hu Liangjun Lu B. M. A. Rahman Jianping Chen State Key Laboratory of Advanced optical Communication Systems and Networks Shanghai Key Laboratory of Navigation and Location ServicesShanghai Institute for Advanced Communication and Data ScienceDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Electrical and electronic Engineering CityUniversity of LondonLondon EC IV OHBUK

Low-power reconfigurable optical circuits are highly demanded to satisfy a variety of different applications. Conventional electro-optic and thermo-optic refractive index tuning methods in silicon photonics are not suitable for reconfiguration of optical circuits due to their high static power consumption and volatility. We propose and demonstrate a nonvolatile tuning method by utilizing the reversible phase change property of GST integrated on top of the silicon waveguide. The phase change is enabled by applying electrical pulses to the lm-sized GST active region in a sandwich structure. The experimental results show that the optical transmission of the silicon waveguide can be tuned by controlling the phase state of GST.

关键词： Phase change material Nonvolatile optical switch Integrated optics devices Chalcogenide Ge2Sb2Te5

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