Fig. 5
Three kinds of sensitivity characteristic analysis in the case of wide-angle incidence. a Three sensitivity functions (\({S}_{\theta }\), \({S}_{\theta }^{{\prime} }\), and \({S}_{\theta }^{{TM}}\)) in the 0°–90° range. The green and blue areas represent the \({\theta }_{{SLR}}\) near the \({0}^{^\circ }\) and \({90}^{^\circ }\), respectively. b The experimental \({S}_{\theta }\) results at different incident angles (30°, 45°, and 60°) and different RI solutions (1.3335, 1.3455, and 1.3620). c The simulated SLR angle \({\theta }_{{SLR}}^{{\prime} }\) and sensitivity \({S}_{\theta }^{{\prime} }\) without considering the refraction effect. d The measured SLR angle \({\theta }_{{SLR}}^{{TM}}\) and sensitivity \({S}_{\theta }^{{TM}}\) of the TM mode SLR sensing
