An improved surface-plasmonic nanobeam cavity for higher Q and smaller V  

作　　者：YU Ping QI Biao XU Chao HU Ting JIANG XiaoQing WANG MingHua YANG JianYi 

机构地区：[1]Department of Information Science and Electronic Engineering,Cyrus Tang Center for Sensor Materials and Applications,Zhejiang University,Hangzhou 310027,China

出　　处：《Chinese Science Bulletin》2012年第25期3371-3374,共4页

基　　金：supported by the National Natural Science Foundation of China (60977043);the National High Technology Research and Development Program of China (2012AA012203);the Open Fund of the State Key Laboratory of China on Integrated Optoelectronics

摘　　要：We demonstrate a high-Q hybrid surface-plasmon-polariton-photonic crystal(SP3C) nanobeam cavity.The proposed cavities are analyzed numerically using the three-dimensional finite difference time domain(3D-FDTD) method.The results show that a Q-factor of 2076 and a modal volume V of 0.16(/2n) 3 can be achieved in a 50 nm silica-gap hybrid SP3C nanobeam cavity when it operates at telecommunications wavelengths and at room temperature.V can be further reduced to 0.02(/2n) 3 when the silica thickness decreases to 10 nm,which leads to a Q/V ratio that is 11 times that of the corresponding plasmonic-photonic nanobeam cavity(without silica).The ultrahigh Q/V ratio originates from the low-loss nature and deep sub-wavelength confinement of the hybrid plasmonic waveguide,as well as the mode gap effect used to reduce the radiation loss.The proposed structure is fully compatible with semiconductor fabrication techniques and could lead to a wide range of applications.We demonstrate a high-Q hybrid surface-plasmon-polariton-photonic crystal （SP3C） nanobeam cavity. The proposed cavities are analyzed numerically using the three-dimensional finite difference time domain （3D-FDTD） method. The results show that a Q-factor of 2076 and a modal volume V of 0.16（λ/2n）^3 can be achieved in a 50 nm silica-gap hybrid SP3C nanobeam cavity when it operates at telecommunications wavelengths and at room temperature. V can be further reduced to 0.02（λ/2n）^3 when the silica thickness decreases to 10 nm, which leads to a Q/V ratio that is 11 times that of the corresponding plasmonic-photonic nanobeam cavity （without silica）. The ultrahigh Q/V ratio originates from the low-loss nature and deep sub-wavelength confinement of the hybrid plasmonic waveguide, as well as the mode gap effect used to reduce the radiation loss. The proposed structure is fully compatible with semiconductor fabrication techniques and could lead to a wide range of applications.

关 键 词：表面等离激元 高Q值 谐振腔 纳米 有限差分时域法 半导体制造技术 梁 表面等离子体 

分 类 号：TN305[电子电信—物理电子学]