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本文设计了一种带有两个水平侧耦合Fabry-Perot(FP)共振腔的基于金属-绝缘体-金属(MIM)结构的Y型表面等离子体光波导结构。传输谱存在一个较窄的阻带,两个腔的长度相同时,两个输出端的传输谱几乎完全重合;两个腔长度不同时每个输出端的传输谱上的阻带位置也不同,并且当一个输出端透射率达到最小时,另一个输出端的透射率接近最大。通过调节两个FP共振腔的长度?宽度以及腔内介质的折射率,可以调节表面等离子体激元在腔内发生共振从而形成驻波的工作波长,实现探测灵敏度高达1280 nm/RIU?品质因子大于200的传感特性。利用这些特性可以在两个输出端对不同的工作波长实现滤波?开关?分束等功能,因此这种亚波长表面等离子体光波导结构在集成光学滤波器?纳米光开关?分束器以及折射率传感器等领域有一定的应用前景?
In this paper, a Y-type surface plasmon waveguide structure based on metal-insulator-metal (MIM) structure with two horizontally coupled Fabry-Perot (FP) resonators is designed. There is a narrow stop band in the transmission spectrum. The transmission spectra of the two outputs are almost coincident when the lengths of the two cavities are the same. The positions of the stop bands on the transmission spectrum of each output are different when the lengths of the two cavities are different. At one output the transmittance is minimized and the output of the other near the maximum transmittance. By adjusting the length and width of the two FP resonators and the refractive index of the medium in the cavity, it is possible to adjust the surface plasmon resonance in the cavity to form the working wavelength of the standing wave, achieving the detection sensitivity of up to 1280 nm / RIU · quality factor Sensitivity greater than 200. These features make it possible to perform filtering, switching, and beam splitting at two output wavelengths at different output wavelengths. Therefore, this subwavelength surface plasmon waveguide structure has the advantages of integrated optical filter, nano-optical switch, beamsplitter and refraction Rate sensor and other fields have a certain application prospects?