新的空间调制光谱技术在半导体超晶格量子阱中的应用  

A NEW TYPE OF SPACIAL MODULATION SPECTROSCOPY APPLIED IN SEMICONDUCTOR SUPERLATTICES QUANTUM WELLS

作　　者：陈辰嘉[1] 王学忠[1] 孙允希[1] 林春 韩一龙 李海涛[1] 蔡明[1] 

机构地区：[1]北京大学物理系

出　　处：《红外与毫米波学报》1999年第3期201-205,共5页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金

摘　　要：报道一种通过转动样品来实现空间调制微分反射（ＤＲ）光谱技术，给出ＧａＡｓ／ＡｌＧａＡｓ多量子阱和应变ＩｎＧａＡｓ／ＧａＡｓ多量子阱在室温下的ＤＲ谱实验测量结果，并与光调制反射谱（ＰＲ）实验和理论计算结果相比较．实验证明ＤＲ谱的信号比ＰＲ谱更强，可达１０－２量级，两者一致并与理论计算结果符合得很好．A new type of differential reflectance (DR) spectroscopy technique that relies on the spacial modulation by rotation was reported. The experimental results in GaAs/AlGaAs and strained InGaAs/GaAs multiple quantum wells by using DR technique at room temperature were presented, and compared with the experimental results of photoreflectance (PR) spectra and the theoretical values.It is shown that both spectra of DR and PR are coincident and in good agreement with the theoretically predicted values. The modulation signal of DR spectra ( ΔR/R ) is about 10 2 , which is much higher than that in PR measurements. It is concluded that DR is an effective method at room temperature for the study of films, semiconductor superlattices and quantum wells.

关 键 词：光调制反射 半导体 多量子阱 超晶格 DR光谱 

分 类 号：O471.4[理学—半导体物理]