基于色散调制硒化锌脊形波导产生超连续谱  

Dispersion engineered ZnSe rib waveguide for mid-infrared supercontinuum generation

作　　者：方依明 杨振 徐培鹏 严昆仑 盛燕 王荣平 FANG Yi-Ming;YANG Zhen;XU Pei-Peng;YAN Kun-Lun;SHENG Yan;WANG Rong-Ping(Laboratory of Infrared Materials and Devices,Ningbo University,Ningbo 315211,China;Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province,Ningbo 315211,China;Laboratory of Silicate Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]宁波大学红外材料与器件实验室,浙江宁波315211 [2]宁波大学浙江省光电探测材料与器件重点实验室,浙江宁波315211 [3]武汉理工大学硅酸盐材料科学与工程实验室,湖北武汉430070

出　　处：《红外与毫米波学报》2021年第4期508-515,共8页Journal of Infrared and Millimeter Waves

基　　金：Supported by National Key R&D Program of China(2020YFB1805900);State Key Laboratory of Silicate Materials for Architectures(Wu‐han University of Technology SYSJJ2019-09);National Natural Science Foundation of China(61775109);3315 Innovation Team in Ningbo,K.C.Wong Magna 251 Fund in Ningbo University.

摘　　要：研究了基于色散调制硒化锌脊形波导中红外超连续谱的产生,仿真表明通过调整波导中波导芯层和包层之间的折射率差距和结构参数,零色散波长可以转移到更短的波长。用2μm厚的Ge_(5)As_(10)S_(85)玻璃作为包层,可以将光场限制在4和8μm宽的波导中。为了解泵浦波长和结构参数对超连续谱产生的影响,模拟5 cm长波导在不同条件下产生的超连续谱。我们的结果表明,泵浦波长和功率以及波导参数是影响超连续谱展宽的主要原因。研究发现,4μm宽硒化锌波导在4.5μm波长20千瓦峰值功率下可以产生3.0∼12.2μm(大于2倍频程)超连续谱,这有利于片上超连续光源应用在生物医学成像、中红外环境和工业传感上。Mid-infrared supercontinuum generation in dispersion-engineered ZnSe rib waveguides was investigat⁃ed for the first time.Numerical results showed that the zero-dispersion wavelength can be shifted to a shorter wavelength by adjusting structural parameters and refractive index contrast between the core and cladding layers in the waveguide.The optical field can be well confined in the 4-and 8-μm wide waveguides with a 2-μm thick cladding layer of Ge_(5)As_(10)S_(85) glass.The effect of waveguide parameters on the bandwidth of the supercontinuum spectrum at a 5-cm-long waveguide was also simulated to understand the effect of the pump wavelength and struc⁃ture parameters on the supercontinuum generation.Our results showed that supercontinuum output could vary over a wide range depending on structural parameters of the waveguide,the pump power and wavelength.An ul⁃trabroad supercontinuum spectrum from 3.0 up to 12.2μm(>2 octaves)was confirmed in a 4μm-width wave⁃guide with a peak pump power of 20 kW and a pump wavelength of 4.5μm,which is promising as one of the on-chip supercontinuum light sources for many applications such as biomedical imaging,and environmental and in⁃dustrial sensing in the mid-infrared.

关 键 词：ZnSe脊波导 超连续谱 孤子自频移 色散调制 

分 类 号：TQ132.41[化学工程—无机化工]