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Type: Journal article
Title: Direct Fabry-Perot effect removal
Author: Withayachumnankul, W.
Ferguson, B.
Rainsford, T.
Mickan, S.
Abbott, D.
Citation: Fluctuation and Noise Letters (FNL), 2006; 6(2):L227-L239
Publisher: World Scientific Publishing Co. Pty. Ltd.
Issue Date: 2006
ISSN: 0219-4775
Statement of
Withawat Withayachumnankul, Bradley Ferguson, Tamath Rainsford, Samuel Mickan and Derek Abbott
Abstract: This study indicates that the removal of reflections from T-ray signals can be carried out in the frequency domain without prior knowledge of material parameters or sample thickness. By fitting polynomials to the logarithm and the argument of the sample's transfer function, the Fabry-Pérot reflection term is canceled out, leading to disappearance of the reflections in spatial domain. The method successfully removes the reflections for optically thick samples under the condition of noise or amplitude fluctuations. The application to optically thin samples is possible when the samples are subjected to broadband terahertz measurements. The Fabry-Pérot free signal, when used as input to the parameter estimation method, results in correct material parameters with low variance.
Keywords: Fabry-Perot removal
terahertz time-domain spectroscopy
gradient-based parameter estimation
noise in photonic measurement systems
Description: © World Scientific Publishing Company
DOI: 10.1142/S0219477506003318
Appears in Collections:Aurora harvest 2
Electrical and Electronic Engineering publications

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