基于表面等离子激元的非对称矩形环腔电可调滤波器设计  

Design of Asymmetric Rectangular Ring Resonance Cavity Electrically Adjustable Filter Based on Surface Plasmon Polaritons

作　　者：吴梦 梁西银[1,2] 孙对兄 谢凌菲[1] 陈瑞霖 文大鹏 张天辰 Wu Meng;Liang Xiyin;Sun Duixiong;Xie Lingfei;Chen Ruilin;Wen Dapeng;Zhang Tianchen(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou,Gansu 730070,China;Engineering Research Center of Gansu Province for Intelligent Information Technology and Application,Lanzhou,Gansu 730070,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070 [2]甘肃省智能信息技术与应用工程研究中心,甘肃兰州730070

出　　处：《光学学报》2020年第14期172-180,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61741513,61965015)。

摘　　要：基于口径耦合的方法提出了金属-绝缘体-金属电压可调滤波器,该滤波器由两个非对称的矩形环腔和一个矩形波导管组成,其中非对称的矩形环腔内填充有机电光材料4-二甲氨基-N-甲基-4-甲苯磺酸盐(DAST)。利用有限元法仿真分析了非对称矩形环腔波导结构的透射光谱、谐振波长分布和磁场强度分布。结果表明,该滤波器的传输频谱比较平滑,通带带宽和阻带带宽较宽,通带的透射率高达97%,阻带的透射率低至0.01%。该滤波器的特性不仅可以通过改变结构参数进行调整,还可以通过施加控制电压进行调节,可调节性较高,且优化结构后阻带带宽更宽,可在集成光学中应用。Based on the aperture coupled method,a metal-insulator-metal voltage tunable filter is proposed.The filter consists of two asymmetric rectangular ring resonance cavities and a rectangular waveguide,in which the asymmetric rectangular ring cavity is filled with organic electro-optic material 4-dimethylamino-N-methyl-4-stilbazolium tosylate.Finite element numerical simulation method is used to calculate and analyze the transmission spectrum,resonance wavelength distribution curve,and magnetic field intensity distribution of the asymmetric rectangular ring cavity waveguide structure.The results show that the filter has smooth transmission spectra,wide passband bandwidth with transmittance as high as 97%,and wide stopband bandwidth with transmittance as low as 0.01%.The characteristics of the filter can be adjusted not only by changing the structural parameters,but also by applying a control voltage.The adjustability of the filter is higher,and the proposed optimized structure has a wider stopband.Therefore,this type of filter can be well applied in integrated optics.

关 键 词：表面等离子激元 金属-绝缘体-金属滤波器 有限元法 矩形环腔 电光材料4-二甲氨基-N-甲基-甲苯磺酸盐(DAST) 口径耦合 

分 类 号：O43[机械工程—光学工程]