Chinese Optics Letters, 2011, 9 (6): 060501, Published Online: Apr. 28, 2011
Reflex optical sensor based on dual metal gratings with high angular sensitivity
金属双栅 反射谱 角度灵敏度 光学传感器。 050.2770 Gratings 260.2110 Electromagnetic optics 280.4788 Optical sensing and sensors
Abstract
An interesting reflection phenomenon in a dual metal grating (DMG) structure is studied, which is related to the competition between Fabry-Perot (F-P) resonance effect and evanescent-field coupling effect inside the gap between the two composing single metal gratings. This competition leads to high angular sensitivity in response to the refractive index variation of the sample solution in the gap. A reflex optical sensor with high sensitivity based on DMG for detecting the change in refractive index is proposed and its performance theoretically is discussed.
Ji Xu, Chen Cheng, Qiang Bai, Jing Chen, Jianping Ding. Reflex optical sensor based on dual metal gratings with high angular sensitivity[J]. Chinese Optics Letters, 2011, 9(6): 060501.