ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
Differential reflectance (DR) is one of the modulation spectroscopies, and its modulation signal arises from the differential reflectance due to the spatial inhomogeneity of the sample. There are several methods to achieve the difference reflectance and we report here an experimental configuration using sample rotation. This configuration looks similar to that adopted previously by reflectance difference spectroscopy (RDS), however in the DR experiments we trace the signal synchronizing with the fundamental rotation frequency (f ) of the sample. In RDS one used the second harmonic frequency of the rotation (2f ) as the reference frequency. We check this method with an InGaAs/GaAs quantum well and an AlGaAs/GaAs heterojunction bipolar transistor (HBT). Both samples show well resolved spectral features which are in good agreement with photoreflectance measurements. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1149671
