Influence of composition in InAs/GaSb type-II superlattices on their optical properties

Author

Tian, Z.-B. ; Plis, E.A. ; Hinkey, R.T. ; Krishna, Sanjay

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of New Mexico, Albuquerque, NM, USA

Volume

50

Issue

23

fYear

2014

fDate

11 6 2014

Firstpage

1733

Lastpage

1734

Abstract

An experimental investigation of the optical properties of mid-wave infrared (MWIR) InAs/GaSb type-II superlattices (T2-SLs) with different compositions is presented. The temperature-dependent absorption spectra of MWIR T2-SLs are extracted from optical transmission measurements. The results show that the optical properties in T2-SLs are closely related to the composition of the superlattice. The absorption coefficient increases with increased temperature, due to bandgap narrowing. The influence of scattering/broadening on the shape of the absorption spectra is also discussed.

Keywords

III-V semiconductors; absorption coefficients; energy gap; gallium compounds; indium compounds; infrared spectra; light scattering; semiconductor superlattices; spectral line broadening; InAs-GaSb; MWIR type-II superlattices; absorption coefficient; bandgap narrowing; light broadening; light scattering; mid-wave infrared type-II superlattices; optical properties; optical transmission measurements; temperature-dependent absorption spectra; type-II superlattice composition;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2014.3129

Filename

6955163