Photoreflectance optimization: A comparison between monochromator and glass filters for photoluminescence and laser light elimination

Autor:	Robert Glosser, Adriana Giordana
Rok vydání:	1990
Předmět:	Photoluminescence Materials science Silicon business.industry chemistry.chemical_element Grating Laser Signal law.invention Optics chemistry law Laser power scaling business Optical filter Instrumentation Monochromator
Zdroj:	Review of Scientific Instruments. 61:2327-2330
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1141359
Popis:	This article evaluates a photoreflectance apparatus in which unwanted photoluminescence and laser light are separated from the signal by a monochromator placed in front of the detector as compared to separation by the more commonly used glass filters. We present results from the application of both techniques to the study of the 3.4‐ and 4.3‐eV structures in both bulk silicon and silicon films on sapphire, the 1.4‐eV structure in GaAs, and the 1.8‐eV structure of Al0.33Ga0.77As. The replacement of glass filters with a second monochromator, in addition to allowing a better rejection of spurious light, extends the range of wavelengths in which a satisfactory photoreflectance signal can be obtained and permits observation of a signal closer to the modulating laser line. On the other hand the use of glass filters can be preferable for high laser power, for weak signals in regions of low grating efficiency, or merely for economical reasons.
Databáze:	OpenAIRE
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