Infrared optical properties of aged porous GaAs

Authors

S. Zangooie, University of Nebraska-Lincoln
Mathias Schubert, University of Nebraska-LincolnFollow
T. E. Tiwald, J.A. Woollam Co.
John A. Woollam, University of Nebraska-LincolnFollow

Date of this Version

5-1-2001

Comments

Published in J. Mater. Res., Vol. 16, No. 5, May 2001 © 2001 Materials Research Society. Used by permission.

Abstract

Aging properties of porous GaAs were investigated nondestructively using variable angle of incidence infrared spectroscopic ellipsometry. In addition to the thickness and volume porosity, properties of the solid part of the porous material are investigated in terms of the long-wavelength dielectric function and chemical composition. The high sensitivity is employed to detect and identify infrared resonant absorptions related to different vibration modes of cubic and amorphous As₂O₃. Resonances centered at 333.3, 480, 785.8, 838, and 1045.5 cm^-1 are from cubic As₂O₃, whereas resonances centered at 350, 490, and 808.5 cm^-1 are from amorphous As₂O₃.