Silicon photonic current sensor based on multimode interference  

作　　者：魏兵 赵昌云 王根成 戴庭舸 杨建义 周柯江 李宇波 

机构地区：[1]College of Information Science and Electronic Engineering, Zhejiang University

出　　处：《Chinese Optics Letters》2016年第3期47-50,共4页中国光学快报（英文版）

基　　金：supported by the National 863 Project of China(No.2015AA017001);the National Natural Science Foundation of China(Nos.61178065,61228501,and61475137);the Zhejiang Province Natural Science Foundation(No.LY14F050005)

摘　　要：We propose and demonstrate an ultrasensitive integrated photonic current sensor that incorporates a silicon- based single-mode-multimode-single-mode waveguide （SMSW） structure. This kind of SMSW structure is placed over a direct current carrying power resistor, which produces Joule＇s heat to change the temperature of the SMSW and further results in the change of the effective refractive index between different propagating modes. Interference occurs when the modes recombine at the second single mode waveguide. Finally, the current variation is measured by monitoring the shift in the output spectrum of the multimode interferometer. In low current, the wavelength shift has almost linear dependence： △ λαIc. This effect can be used as a current sensor with a slope efficiency of 4.24 nm/A in the range of 0-200 mA.We propose and demonstrate an ultrasensitive integrated photonic current sensor that incorporates a silicon- based single-mode-multimode-single-mode waveguide （SMSW） structure. This kind of SMSW structure is placed over a direct current carrying power resistor, which produces Joule＇s heat to change the temperature of the SMSW and further results in the change of the effective refractive index between different propagating modes. Interference occurs when the modes recombine at the second single mode waveguide. Finally, the current variation is measured by monitoring the shift in the output spectrum of the multimode interferometer. In low current, the wavelength shift has almost linear dependence： △ λαIc. This effect can be used as a current sensor with a slope efficiency of 4.24 nm/A in the range of 0-200 mA.

关 键 词：INTERFEROMETERS Refractive index WAVEGUIDES 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]