Detection of a small change in a refractive index by use of polarization of surface plasmons excited on periodic structures

本研究的目的是开发一种由周期结构组成的高分辨率表面等离子体传感器，用于原位测量气体或液体样品折射率的微小变化。研究结果表明：制备了由全息金属光栅组成的等离子体传感器；利用所提出的等离子体传感器，实验证实了空气与几种气体样品（氧、氮、氢）的折射率差异；我们为等离子体传感器开发了一个模拟程序，使我们能够解决关于周期性结构表面等离子体共振的实验结果。

The purpose of this study is to develop a high-resolution surface plasmon sensor composed of periodic structures, for the in-situ measurement of small changes in a refractive index of gas or liquid samples. The results obtained in the study are as follows : we fabricated a plasmon sensor composed of a holographic metal grating ; and we experimentally confirmed the difference between of a refractive index of air and one of several gas samples (oxygen, nitrogen, and hydrogen) by using the proposed plasmon sensor ; and we developed a simulation program for the plasmon sensor that enables us to resolve experimental results with respect to surface plasmon resonances on periodic structures.