Campus Units

Electrical and Computer Engineering

Document Type

Article

Publication Version

Published Version

Publication Date

3-5-2018

Journal or Book Title

Optics Express

Volume

26

Issue

5

First Page

6331

Last Page

6344

DOI

10.1364/OE.26.006331

Abstract

We present an effective yet simple approach to study the dynamic variations in optical properties (such as the refractive index (RI)) of graphene oxide (GO) when exposed to gases in the visible spectral region, using the thin-film interference method. The dynamic variations in the complex refractive index of GO in response to exposure to a gas is an important factor affecting the performance of GO-based gas sensors. In contrast to the conventional ellipsometry, this method alleviates the need of selecting a dispersion model from among a list of model choices, which is limiting if an applicable model is not known a priori. In addition, the method used is computationally simpler, and does not need to employ any functional approximations. Further advantage over ellipsometry is that no bulky optics is required, and as a result it can be easily integrated into the sensing system, thereby allowing the reliable, simple, and dynamic evaluation of the optical performance of any GO-based gas sensor. In addition, the derived values of the dynamically changing RI values of the GO layer obtained from the method we have employed are corroborated by comparing with the values obtained from ellipsometry.

Comments

This article is published as Tabassum, Shawana, Liang Dong, and Ratnesh Kumar. "Determination of dynamic variations in the optical properties of graphene oxide in response to gas exposure based on thin-film interference." Optics Express 26, no. 5 (2018): 6331-6344. DOI: 10.1364/OE.26.006331. Posted with permission.

Rights

Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.

Copyright Owner

Optical Society of America

Language

en

File Format

application/pdf

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