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- W2009806997 abstract "There is a large number of technologically important semiconducting optoelectronic materials with narrow band-gaps in the “finger-print” region of the infra-red (IR) spectrum. However, in many instances their band-structures have not been very well characterised, making it difficult to engineer their properties. Part of the reason is that the key non-destructive optical characterisation tool, modulation spectroscopy, becomes increasingly difficult as one attempts to look further out into the IR. To date, conventional diffraction-grating-based modulation spectroscopy has been applied predominantly below ∼4 µm. We have developed a new photo-modulation system, based on a Fourier transform spectrometer, that permits such measurements out to much longer wavelengths. We discuss the advantages and technical difficulties of implementing such a system, and give the results obtained so far for narrower-gap materials, including bulk-like GaSb, InAs and InSb, comparing these with what can be obtained with conventional modulation spectroscopy arrangements. We apply our new technique to measure the bandgap in dilute-N InSbN, achieving what we believe are the first modulation spectroscopy measurements in the mid-IR beyond ∼6 µm. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)" @default.
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- W2009806997 date "2005-05-01" @default.
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- W2009806997 title "A new Fourier transform photo-modulation spectroscopic technique for narrow band-gap materials in the mid- to far-infra-red" @default.
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- W2009806997 doi "https://doi.org/10.1002/pssa.200460908" @default.
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