Absorption and dispersion in undoped epitaxial GaSb layer

In this paper, we present the results of a theoretical and experimental investigation into the refractive index and absorption, at room temperature, of a 4 m-thick undoped epitaxial layer of GaSb deposited on a GaAs substrate. A theoretical formula for optical transmission through an etalon was deri...

Full description

Saved in:
Bibliographic Details
Published in:Materials research express 2018-02, Vol.5 (2), p.25907
Main Authors: Wasiak, Micha, Motyka, Marcin, Smo ka, Tristan, Ratajczak, Jacek, Jasik, Agata
Format: Article
Language:English
Subjects:
GaSb
optical absorption
optical transmission
refractive index
spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we present the results of a theoretical and experimental investigation into the refractive index and absorption, at room temperature, of a 4 m-thick undoped epitaxial layer of GaSb deposited on a GaAs substrate. A theoretical formula for optical transmission through an etalon was derived, taking into account the finite coherence length of the light. This formula was used to analyse the measured transmission spectra. The refractive index was determined in a wide spectral range, between 0.105 eV and 0.715 eV. The absorption was determined for photon energies between 0.28 eV and 0.95 eV. An Urbach tail was observed in the absorption spectrum, as well as a constant increase in absorption in the spectral region above the band gap.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/aaae86