Reflex optical sensor based on dual metal gratings with high angular sensitivity |
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| Authors: | Ji Xu Chen Cheng Qiang Bai Jing Chen and Jianping Ding |
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| Institution: | 1 Nanjing National Laboratory of Microstructures and School of Physics, Nanjing University, Nanjing 210093, China 2 School of Physics and Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin 300071, China 3 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China |
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| Abstract: | An interesting reflection phenomenon in a dual metal grating (DMG) structure is studied, which is related to the competition between Fabry-Prot (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. |
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