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本文利用方形谐振器与两个金属/介质/金属型波导结构耦合设计了一个亚波长的表面等离子体波导传感器,并通过有限元分析研究了此结构的传输特性。研究表明,通过谐振器耦合能有效增强共振波长的表面等离子体波的透射能力,同时减小两侧波导结构与方形谐振器之间的金属势垒层宽度可提高透射率。传感器的共振波长与介质材料的折射率之间存在着线性关系,1阶共振模的灵敏度可达1100nm/RIU。这种传感器可实现器件的小型化,在生物、工业传感领域有着很大的潜力。
In this paper, a subwavelength surface plasmon waveguide sensor is designed by coupling a square resonator with two metal / dielectric / metal waveguide structures and the transmission characteristics of the structure are studied by finite element analysis. The research shows that the transmittance can be enhanced by the resonator coupling effectively enhancing the transmission of the surface plasmon wave at the resonance wavelength while reducing the width of the metal barrier layer between the waveguide structures on both sides and the square resonator. There is a linear relationship between the resonant wavelength of the sensor and the refractive index of the dielectric material. The sensitivity of the first-order resonant mode can reach 1100 nm / RIU. This kind of sensor can realize the miniaturization of the device, has great potential in the field of biology, industry sensing.