摘要
采用口径耦合的方法构造了一种金属-介质-金属非对称结构滤波器,由两个半圆腔通过两个矩形口径与波导管相连形成.运用有限元法仿真计算获得了该结构的磁场、透射谱、带宽及边沿陡峭度分布曲线.研究结果表明,通过调节结构参数,滤波器的透射曲线出现明显的红移或蓝移现象,且曲线分布平滑,其通带透射比高达0.95,阻带则具有平坦特性且透射比低至0.001,通带、阻带均具有较宽的带宽.对滤波器进行结构参数优化,可以实现类似矩形滤波器的特性,在光通信波段的三个通信窗口能够实现通道选择的滤波功能.该滤波器在微纳光学器件集成尤其是光通信系统中有良好的应用前景.
A metal-insulator-metal asymmetric structure filter is proposed based on the aperture coupled method,which is composed of two semi-circular cavities,a waveguide and two rectangular apertures connecting the semi-circular cavities and the waveguide.The finite element method is used to simulate and calculate its magnetic field distribution,transmission spectra,bandwidth and edge steepness distribution curves.The results show that the obvious red shift or blue shift phenomenon will be occurred in the transmission curve when the structure parameters are adjusted,and the transmission curve is very smooth.Its pass-band＇s transmittance can reach 0.95,its stop-band has the flat characteristics and the transmittance is as low as 0.001.Besides,its pass-band and stop-band all have a wide bandwidth.After optimizing the structure parameters,the filter can realize a similar function of the rectangular filter and the filtering function of channel selection of the three optical communication windows at telecommunication regime.The proposed filter can be well applied in the micro/nano optical integrated devices,especially in optical communication systems.
作者
王志爽
张冠茂
刘海瑞
乔利涛
WANG Zhi-shuang, ZHANG Guan-mao, LIU Hai-rui, QIAO Li-tao(Institute of Modern Communication Technology, School of Information Science and Engineering, Lanzhou University, Lanzhou 730000, Chin)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2018年第4期82-89,共8页
Acta Photonica Sinica
基金
国家自然科学基金重点项目(No.61631007)
中央高校基本科研业务费专项资金(兰州大学)(No.lzujbky-2015-K7)资助~~
关键词
表面等离子激元
非对称金属-介质-金属结构滤波器
有限元方法
半圆形谐振腔
口径耦合
传输透射谱
Surface plasmon polaritons
Asymmetrical metal-insulator-metal structure filter
Finiteelement method
Semi-circular resonance cavity
Aperture coupled
Transmission spectrum
