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Complex refractive index determination using planar and converging beam transfer functions

Complex refractive index determination using planar and converging beam transfer functions
Complex refractive index determination using planar and converging beam transfer functions
Terahertz time domain spectroscopy can help us to determine the complex refractive index of materials. To achieve this a theoretical model of the spectrometer has to be implemented; a usual method for refractive index determination is to fit a theoretically calculated transfer function to the experimental data. Material parameter extraction models based on transfer functions can be of varying complexity based on the requirements for accuracy and also the difficulty of factoring all experimental parameters. Here, we are going to show how algorithms based on transfer functions with different complexity can be setup. It will be described howa transfer function can be used to extract the refractive index of material and the key stages of the analysis, the fitting algorithm, and the need for phase unwrapping. Transfer functions of an increasing complexity will be shown, with and without the etalon term, using planar or converging beam. © Springer-Verlag Berlin Heidelberg 2013. © Springer-Verlag Berlin Heidelberg 2013.
0342-4111
81-94
Springer
Apostolopoulos, Vasilis
8a898740-4c71-4040-a577-9b9d70530b4d
Daniell, Geoff
36dd7055-af34-48c7-88a3-f2e5f633d52c
Chung, Aaron
b548b7cc-c33a-45e4-8634-3c44a250d207
K.E., Peiponen
J.A., Zeitler
M., Kuwata-Gonokami
Apostolopoulos, Vasilis
8a898740-4c71-4040-a577-9b9d70530b4d
Daniell, Geoff
36dd7055-af34-48c7-88a3-f2e5f633d52c
Chung, Aaron
b548b7cc-c33a-45e4-8634-3c44a250d207
K.E., Peiponen
J.A., Zeitler
M., Kuwata-Gonokami

Apostolopoulos, Vasilis, Daniell, Geoff and Chung, Aaron (2012) Complex refractive index determination using planar and converging beam transfer functions. In, K.E., Peiponen, J.A., Zeitler and M., Kuwata-Gonokami (eds.) Springer Series in Optical Sciences. (Springer Series in Optical Sciences, , (doi:10.1007/978-3-642-29564-5_4#page-1), 171) Berlin; Heidelberg. Springer, pp. 81-94. (doi:10.1007/978-3-642-29564-5_4#page-1).

Record type: Book Section

Abstract

Terahertz time domain spectroscopy can help us to determine the complex refractive index of materials. To achieve this a theoretical model of the spectrometer has to be implemented; a usual method for refractive index determination is to fit a theoretically calculated transfer function to the experimental data. Material parameter extraction models based on transfer functions can be of varying complexity based on the requirements for accuracy and also the difficulty of factoring all experimental parameters. Here, we are going to show how algorithms based on transfer functions with different complexity can be setup. It will be described howa transfer function can be used to extract the refractive index of material and the key stages of the analysis, the fitting algorithm, and the need for phase unwrapping. Transfer functions of an increasing complexity will be shown, with and without the etalon term, using planar or converging beam. © Springer-Verlag Berlin Heidelberg 2013. © Springer-Verlag Berlin Heidelberg 2013.

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Published date: 4 October 2012
Organisations: Physics & Astronomy, Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 411424
URI: https://eprints.soton.ac.uk/id/eprint/411424
ISSN: 0342-4111
PURE UUID: 853a0448-5ae0-4962-9406-9b8496f9198f
ORCID for Vasilis Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191

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Date deposited: 20 Jun 2017 16:31
Last modified: 20 Jul 2019 00:51

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Contributors

Author: Geoff Daniell
Author: Aaron Chung
Editor: Peiponen K.E.
Editor: Zeitler J.A.
Editor: Kuwata-Gonokami M.

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