期刊
JOURNAL OF APPLIED PHYSICS
卷 115, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4885426
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资金
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
- Dutch ministry of economic affairs
- European Research Council (ERC)
We present a method to separate coherent and incoherent contributions to cathodoluminescence from bulk materials by using angle-resolved cathodoluminescence spectroscopy. Using 5 and 30 keV electrons, we measure the cathodoluminescence spectra for Si, GaAs, Al, Ag, Au, and Cu and determine the angular emission distributions for Al, GaAs, and Si. Aluminium shows a clear dipolar radiation profile due to coherent transition radiation, while GaAs shows incoherent luminescence characterized by a Lambertian angular distribution. Silicon shows both transition radiation and incoherent radiation. From the angular data, we determine the ratio between the two processes and decompose their spectra. This method provides a powerful way to separate different radiative cathodoluminescence processes, which is useful for material characterization and in studies of electron-and light-matter interaction in metals and semiconductors. (C) 2014 AIP Publishing LLC.
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