On-chip methane sensing by near-IR absorption signatures in a photonic crystal slot waveguide

被引:187
|
作者
Lai, Wei-Cheng [2 ]
Chakravarty, Swapnajit [1 ]
Wang, Xiaolong [1 ]
Lin, Cheyun [2 ]
Chen, Ray T. [2 ]
机构
[1] Omega Opt Inc, Austin, TX 78759 USA
[2] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA
关键词
GAS-DETECTION; SPECTROSCOPY; MICROCAVITIES;
D O I
10.1364/OL.36.000984
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We demonstrate a 300 mu m long silicon photonic crystal (PC) slot waveguide device for on-chip near-infrared absorption spectroscopy, based on the Beer-Lambert law for the detection of methane gas. The device combines slow light in a PC waveguide with high electric field intensity in a low-index 90 nm wide slot, which effectively increases the optical absorption path length. A methane concentration of 100 ppm (parts per million) in nitrogen was measured. (C) 2011 Optical Society of America
引用
收藏
页码:984 / 986
页数:3
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