共振声子太赫兹量子级联激光器研究(英文)  

Study of Resonant-Phonon Terahertz Quantum-Cascade Lasers

作　　者：曹俊诚[1] 黎华[1] 吕京涛[1] 

机构地区：[1]中国科学院太赫兹固态技术重点实验室,中国科学院上海微系统与信息技术研究所,上海200050

出　　处：《物理学进展》2011年第1期22-45,共24页Progress In Physics

基　　金：the support from the Alexander von Humboldt Foundation;supported by the National Basic Research Program of China(Grant No.2007CB310402);the 863 program of China;the National Natural Science Foundation of China(Grant No.60721004);the major projects(Project Nos.KGCX1-YW-24 and KGCX2-YW-231);the Hundred Talent Program of the Chinese Academy of Sciences;the Shanghai Municipal Commission of Science and Technology(Project No.10JC1417000)

摘　　要：本文综述了共振声子太赫兹(THz)量子级联激光器(QCL)载流子输运及其光电特性的研究结果。我们采用Monte Carlo方法模拟了不同有源区结构的共振声子THz QCL,如四阱有源区和三阱有源区结构等,优化了THz QCL的器件参数。计算表明,器件的增益依赖于注入势垒的宽度、掺杂浓度和声子抽运能级间隔等参数。单阱注入的THz QCL可以获得低的激射频率,而三阱有源区结构的THz QCL具有更高的工作温度。我们数值模拟了这两种器件结构在不同寄生电压下的电子输运、增益以及温度特性等。同时,我们实验测量了THz QCL的发射谱偏压和温度效应,计算结果与实验相吻合。研究结果表明,随着偏压增加发射谱出现了明显的频率蓝移,多模激射仅出现在大电流注入情形。与偏压的密切依赖关系不同,激射频率对温度的变化并不敏感。We give a brief review of researches on carrier transport and output characteristics of resonant-phonon terahertz（THz） quantum-cascade lasers（QCLs）.Different active region designs,i.e.,four-well active module,three-well active module,and GaN-based module,are considered.By using the Monte Carlo method,we optimize the device parameters of resonant-phonon THz QCLs.The results show that the calculated gain is more sensitive to the injection barrier width,the doping concentration,and the phonon extraction level separation,which is consistent with the experiments.As the most promising active region designs,THz QCLs with one-well injector and three-well active module demonstrate outstanding advantages in low frequency lasing and high operating temperature,respectively.The electron transport under different parasitic biases,the material gain,and the temperature performance of the two structures are compared.Meanwhile,we experimentally investigate the bias and temperature effects on the emission spectra.The simulation is also carried out to prove the measured results.The results show that a frequency blueshift with increasing bias is clearly observed and the multimode lasing appears only in high current injection.Different from the rigidly bias-dependence,the lasing frequency is insensitive to temperature.

关 键 词：太赫兹量子级联激光器 共振声子 蒙特卡洛模拟 发射谱测量 增益 

分 类 号：TN248[电子电信—物理电子学]