An Integrated-Plasmonic Chip of Bragg Reflection and Mach-Zehnder Interference Based on Metal-Insulator-Metal Waveguide  

An Integrated-Plasmonic Chip of Bragg Reflection and Mach-Zehnder Interference Based on Metal-Insulator-Metal

作　　者：Liang ZENG Jiaqi LI Chengyi CAO Xudong LI Xinyuan ZENG Quanhao YU Kunhua WEN Jun YANG Yuwen QIN 

机构地区：[1]School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China [2]School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China [3]Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Photonic Sensors》2022年第3期58-67,共10页光子传感器（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2019YFB1803505);the National Natural Science Foundation of China(Grant Nos.U2001601,62175039,and 61925501);the Science and Technology Project of Guangzhou(Grant No.201904010243);Major Special Projects in Guangdong Province(Grant No.2018B010114002);the Engineering Research Center of Digital Imaging and Display,Ministry of Education,Soochow University(Grant No.SDGC2133);the Program for Guangdong Introducing Innovative and Enterpreneurial Teams.

摘　　要：In this paper,a Bragg reflector is proposed by placing periodic metallic gratings in the center of a metal-insulator-metal(MIM)waveguide.According to the effective refractive index modulation caused by different waveguide widths in a period,a reflection channel with a large bandwidth is firstly achieved.Besides,the Mach-Zehnder interference(MZI)effect arises by shifting the gratings away from the waveguide center.Owing to different optical paths with unequal indices on both sides of the grating,a narrow MZI band gap will be obtained.It is interesting to find out that the Bragg reflector and Mach-Zehnder interferometer are immune to each other,and their wavelengths can be manipulated by the period and the grating length,respectively.Additionally,we can obtain three MZI channels and one Bragg reflection channel by integrating three different gratings into a large period.The performances are investigated by finite-difference time-domain(FDTD)simulations.In the index range of 1.33–1.36,the maximum sensitivity for the structure is as high as 1500 nm/RIU,and it is believed that this proposed structure can find widely applications in the chip-scale optical communication and sensing areas.

关 键 词：Bragg reflector metal-insulator-metal Mach-Zehnder interference effective refractive index modulation 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]