【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．ＤＲ谱是研究薄膜和微结构的有效方法更多还原

【Abstract】 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.更多还原