Please use this identifier to cite or link to this item: https://doi.org/10.1364/OE.26.026242
Title: Efficient and broadband subwavelength grating coupler for 3.7 mu m mid-infrared silicon photonics integration
Authors: Chen, Nan 
Dong, Bowei 
Luo, Xianshu
Wang, Hong
Singh, Navab
Lo, Guo-Qiang
Lee, Chengkuo 
Keywords: Science & Technology
Physical Sciences
Optics
INSULATOR WAVE-GUIDES
INTERLEAVED TRENCHES
Issue Date: 1-Oct-2018
Publisher: OPTICAL SOC AMER
Citation: Chen, Nan, Dong, Bowei, Luo, Xianshu, Wang, Hong, Singh, Navab, Lo, Guo-Qiang, Lee, Chengkuo (2018-10-01). Efficient and broadband subwavelength grating coupler for 3.7 mu m mid-infrared silicon photonics integration. OPTICS EXPRESS 26 (20) : 26242-26256. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.26.026242
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.
Source Title: OPTICS EXPRESS
URI: https://scholarbank.nus.edu.sg/handle/10635/190120
ISSN: 10944087
DOI: 10.1364/OE.26.026242
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