【摘要】 设计了一种带有条形间隔的矩形腔结构波导滤波器,并且利用时域有限差分法(FDTD)对其滤波特性进行了分析。结果表明该滤波器可以看成是两个T形腔的背向耦合,其透射性质与单T形腔类似,改变腔的长度和宽度可以改变透射谱的中心波长,以实现不同波长的滤波功能。更多还原

【Abstract】 Surface plasmon polaritons(SPPs)is the coherent oscillation of free charges propagating at the metal-dielectric interfaces and has been considered as one of promising candidates to overcome the classical diffraction limit for their ability to guide and manipulate light at deep subwavelength scales.In this paper,aplasmonic waveguide filter based on a rectangular geometry resonator with a strip-type inset is proposed and demonstrated.The physical mechanism of the device is deduced and the finite difference time domain(FDTD)method is employed to simulate and study its properties.The results show that the transmission characteristic of the proposed configuration is similar with the T-shaped filter and the cutoff wavelengthes could be modulated by changing the length or widthes of the cavity.更多还原