基于表面等离激元的谐振腔侧面耦合MDM结构波导滤波器色散关系及透射谱  

Dispersion and transmission property of resonator side coupling MDM waveguide based on surface plasmon polaritons

作　　者：金桂[1] 黄小益[1] 黄健全[1] 

机构地区：[1]湘南学院电子信息与电气工程学院,湖南郴州423000

出　　处：《量子电子学报》2015年第6期648-653,共6页Chinese Journal of Quantum Electronics

基　　金：湖南省自然科学基金(12JJ6008);湖南省教育厅科学研究项目(14C1061);湖南省高校科技创新团队支持计划资助(2014-207)

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800-2000nm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50nm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。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 4-9μm 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.

关 键 词：表面光学 表面等离激元 滤波器 耦合谐振腔 色散关系 透射谱 

分 类 号：TN252[电子电信—物理电子学]