为了对溶液折射率进行精确测量和传感, 采用转移矩阵法对Ce∶YIG/Ag/liquid 3层基于磁光表面等离子共振的结构与棱镜组成耦合系统进行了数值计算, 并用有限元法进行了模拟仿真。由低损耗的Ag和强磁光性的Ce∶YIG组成的结构在入射光波长为980nm时, 灵敏度达到4.082/RIU(溶液折射率n=1.330~1.340)。结果表明, 与其它传统的表面等离子共振传感结构相比, 本文中提出的折射率传感器的灵敏度大大提高。该结构在实际应用中可以更加简便地探测溶液的折射率。

In order to measure and detect refractive index of solution, by using transfer matrix method, the coupling system of Ce∶YIG/Ag/liquid three-layer structure and prism based on magneto optic surface plasma resonance was studied. Numerical calculation was carried out and finite element method was used to simulate. For the structure composed of low loss Ag and strong magneto optical Ce∶YIG, its sensitivity is to 4.082/RIU, solution refractive index is 1.330~1.340 when incident light wavelength is 980nm. The results show that compared with other conventional surface plasma resonance sensing structures, the sensitivity of the refractive index sensor presented in this paper is greatly improved. The structure can be used to detect refractive index of the solution more easily.