Matsuda Toyonori, Odagawa Hiroyuki
Appl Opt. 2021 May 1;60(13):3569-3578. doi: 10.1364/AO.420857.
We focus on the normalized Stokes parameter of the specularly reflected light from a metal grating in a conical mounting in order to accurately and sensitively detect the occurrence of surface plasmon resonance (SPR). Experimental and theoretical investigations into the incident angle dependence of reveal a rapid change in around the resonance angle at which SPR occurs. The rapid change in has features that are successfully applied to SPR sensing: the zero-crossing point of determines , and in the vicinity of varies markedly in response to a small change in the refractive index of a sample. An experiment using gas samples demonstrates that SPR sensing that considers the rapid change in clearly detects a refractive index change on the order of 10.
我们聚焦于圆锥形装置中金属光栅镜面反射光的归一化斯托克斯参数，以便准确且灵敏地检测表面等离子体共振（SPR）的发生。对其入射角依赖性的实验和理论研究表明，在SPR发生的共振角附近，其会发生快速变化。这种快速变化具有一些特征，这些特征已成功应用于SPR传感：的过零点决定了，并且在附近，响应于样品折射率的微小变化，会有显著变化。使用气体样品的实验表明，考虑到快速变化的SPR传感能够清晰地检测到约为10的折射率变化。
