【摘要】 研究了一类L形和矩形谐振腔侧面耦合MDM结构亚波长表面等离激元滤波器的色散关系和透射谱。研究结果表明等效折射率的实部和虚部在短波部分变化较大,在800~2000 nm长波部分趋于稳定值,传播距离随着波长的增加和介质层厚度的增加均增加,当波导宽度在50 nm以上时,SPPs的传播距离在所研究的波长范围内为4~9μm,可以满足纳米光子器件的尺寸要求。对侧面L型谐振腔和矩形谐振腔耦合的透射谱研究表明在保持腔体总长度不变的情况下,两种耦合方式所产生的光谱曲线完全相似,说明禁带的出现只与谐振腔的长度有关系,对集成光子器件的研发具有一定的参考意义。更多还原

【Abstract】 A sub-wavelength surface plasmon polariton wavelength filter which consists of an L shape cavity and a rectangle cavity coupled to a straight metal-dielectric-metal(MDM) waveguide was proposed and investigated numerically.The simulation results show that the real and imagine part of effective index changed rapidly at short wavelength and reached a constant at long wavelength 800~2000 nm.The propagation distance increased with the increasing of wavelength and waveguide width.When the waveguide width is over 50 nm it reaches 4~9 μm which can meet the photonic device.The L shape cavity and rectangle shape cavity side coupling reached a similar result as if their length equal to each other,it showed that the forbidden band only has relation with cavity length and it has a reference meaning for development of integrated photonic device.更多还原