Wavelength-flattened directional coupler based mid-infrared chemical sensor using bragg wavelength in subwavelength grating structure

• Main Authors: Dong, Bowei, Hu, Ting, Luo, Xianshu, Chang, Yuhua, Guo, Xin, Wang, Hong, Kwong, Dim-Lee, Lo, Guo-Qiang, Lee, Chengkuo
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: Photonics Sensors; Nanophotonics; DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/88880; http://hdl.handle.net/10220/46978
• Institution: Nanyang Technological University

In this paper, we report a compact wavelength-flattened directional coupler (WFDC) based chemical sensor featuring an incorporated subwavelength grating (SWG) structure for the mid-infrared (MIR). By incorporating a SWG structure into directional coupler (DC), the dispersion in DC can be engineered...