Near Band-Edge Field-Dependent Absorption Coefficient and Refractive Index Determined By Photocurrent and Transmittance Measurements

M.G. Xu, John Dell, J.F. Siliquini, P. Chavarkar

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A technique is proposed for the extraction of precise values of field-dependent absorption coefficient alpha and refractive index n from photocurrent and transmittance measurements of optical modulator structures. The technique uses approximate results of alpha and n extracted from a simplified device as the initial input into an iterative procedure that utilizes the consistency between alpha and n to obtain successively better estimates of these parameters. The technique was applied to results that were measured experimentally, and we verified the accuracy by using synthetic data. Errors caused by measurement inaccuracy are also investigated. It is shown that the absorption coefficient has a modest sensitivity whereas the refractive index is insensitive to these errors. (C) 1999 Optical Society of America. OCIS codes: 120.4530, 230.5590, 230.2090, 230.4110, 190.5970, 310.6860.
Original languageEnglish
Pages (from-to)5127-5132
JournalApplied Optics
Volume28
Issue number24
DOIs
Publication statusPublished - 1999

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