Efficient and broadband subwavelength grating coupler for 37 μm mid-infrared silicon photonics integration
- 24 September 2018
- journal article
- research article
- Published by Optica Publishing Group in Optics Express
- Vol. 26 (20) , 26242-26256
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.Keywords
Funding Information
- Nanyang Technological University (NTU)
- National Natural Science Foundation of China (NSFC) (61474078)
- National Research Foundation Singapore (NRF) (NRF2015-NRF-ISF001-2620 NUS, NRF-CRP001-019)
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