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Title: Efficient and broadband subwavelength grating coupler for 3.7 μm mid-infrared silicon photonics integration
Authors: Chen, Nan
Dong, Bowei
Luo, Xianshu
Wang, Hong
Singh, Navab
Lo, Guo-Qiang
Lee, Chengkuo
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Silicon Photonics Integration
Grating Coupler
Issue Date: 2018
Source: Chen, N., Dong, B., Luo, X., Wang, H., Singh, N., Lo, G.-Q., & Lee, C. (2018). Efficient and broadband subwavelength grating coupler for 3.7 μm mid-infrared silicon photonics integration. Optics Express, 26(20), 26242-26256. doi:10.1364/OE.26.026242
Series/Report no.: Optics Express
Abstract: A grating coupler is an essential building block for compact and flexible photonics integration. In order to meet the increasing demand of mid-infrared (MIR) integrated photonics for sensitive chemical/gas sensing, we report a silicon-on-insulator (SOI) based MIR subwavelength grating coupler (SWGC) operating in the 3.7 μm wavelength range. We provide the design guidelines of a uniform and apodized SWGC, followed by numerical simulations for design verification. We experimentally demonstrate both types of SWGC. The apodized SWGC enables high coupling efficiency of −6.477 dB/facet with 3 dB bandwidth of 199 nm, whereas the uniform SWGC shows larger 3dB bandwidth of 263.5 nm but slightly lower coupling efficiency of −7.371 dB/facet.
ISSN: 1094-4087
DOI: 10.1364/OE.26.026242
Schools: School of Electrical and Electronic Engineering 
Rights: © 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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