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High-precision THz-TDS via self-referenced transmission echo method

High-precision THz-TDS via self-referenced transmission echo method
High-precision THz-TDS via self-referenced transmission echo method
Terahertz time-domain spectroscopy is a powerful characterisation technique which allows for the frequency dependent complex refractive index of a sample to be determined. This is achieved by comparing the time-domain of a pulse transmitted through air to a pulse transmitted through a material sample, however the requirement for an independent reference scan can introduce errors due to laser fluctuations, mechanical drift, and atmospheric absorption. In this paper we present a method for determining complex refractive index without an air reference, in which the first pulse transmitted through the sample is compared against the ’echo’ pulse where the internal reflections delay the transmission of the echo pulse. We present a benchmarking experiment in which the echo reference method is compared to the traditional air method, and show the echo method is able to reduce variation in real refractive index.
1559-128X
Gorecki, Jonathan
7571a01a-8519-411a-b44e-c67a169387e6
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Piper, Lewis, Kieran
85fa16d7-a404-44c8-a1a3-58aeed164b3d
Klokkou, Nicholas, Thomas
1b031e0d-6e88-4e9c-8c20-a38b8dc1e858
Mailis, Sakellaris
9fcc2cc8-9c00-452e-b785-a20263cfb33b
Gorecki, Jonathan
7571a01a-8519-411a-b44e-c67a169387e6
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Piper, Lewis, Kieran
85fa16d7-a404-44c8-a1a3-58aeed164b3d
Klokkou, Nicholas, Thomas
1b031e0d-6e88-4e9c-8c20-a38b8dc1e858
Mailis, Sakellaris
9fcc2cc8-9c00-452e-b785-a20263cfb33b

Gorecki, Jonathan, Apostolopoulos, Vasileios, Papasimakis, Nikitas, Piper, Lewis, Kieran, Klokkou, Nicholas, Thomas and Mailis, Sakellaris (2020) High-precision THz-TDS via self-referenced transmission echo method. Applied Optics. (doi:10.1364/AO.391103). (In Press)

Record type: Article

Abstract

Terahertz time-domain spectroscopy is a powerful characterisation technique which allows for the frequency dependent complex refractive index of a sample to be determined. This is achieved by comparing the time-domain of a pulse transmitted through air to a pulse transmitted through a material sample, however the requirement for an independent reference scan can introduce errors due to laser fluctuations, mechanical drift, and atmospheric absorption. In this paper we present a method for determining complex refractive index without an air reference, in which the first pulse transmitted through the sample is compared against the ’echo’ pulse where the internal reflections delay the transmission of the echo pulse. We present a benchmarking experiment in which the echo reference method is compared to the traditional air method, and show the echo method is able to reduce variation in real refractive index.

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Echo Reference - Accepted Manuscript
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Accepted/In Press date: 28 April 2020

Identifiers

Local EPrints ID: 441083
URI: http://eprints.soton.ac.uk/id/eprint/441083
ISSN: 1559-128X
PURE UUID: 91ca5413-bb60-4696-ba31-c3e044ad2994
ORCID for Vasileios Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191
ORCID for Nikitas Papasimakis: ORCID iD orcid.org/0000-0002-6347-6466
ORCID for Nicholas, Thomas Klokkou: ORCID iD orcid.org/0000-0002-0999-3745

Catalogue record

Date deposited: 29 May 2020 16:31
Last modified: 29 Jul 2020 01:44

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