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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 (TDS) is a powerful characterization 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”, 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 that the echo method is able to reduce variation in real refractive index.

1559-128X
6744-6750
Gorecki, Jonathan
6f68dd34-2d89-4063-baf6-8bb6cf8ccfe8
Klokkou, Nicholas, Thomas
1b031e0d-6e88-4e9c-8c20-a38b8dc1e858
Piper, Lewis, Kieran
85fa16d7-a404-44c8-a1a3-58aeed164b3d
Mailis, Sakellaris
9fcc2cc8-9c00-452e-b785-a20263cfb33b
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d
Gorecki, Jonathan
6f68dd34-2d89-4063-baf6-8bb6cf8ccfe8
Klokkou, Nicholas, Thomas
1b031e0d-6e88-4e9c-8c20-a38b8dc1e858
Piper, Lewis, Kieran
85fa16d7-a404-44c8-a1a3-58aeed164b3d
Mailis, Sakellaris
9fcc2cc8-9c00-452e-b785-a20263cfb33b
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d

Gorecki, Jonathan, Klokkou, Nicholas, Thomas, Piper, Lewis, Kieran, Mailis, Sakellaris, Papasimakis, Nikitas and Apostolopoulos, Vasileios (2020) High-precision THz-TDS via self-referenced transmission echo method. Applied Optics, 59 (22), 6744-6750. (doi:10.1364/AO.391103).

Record type: Article

Abstract

Terahertz time-domain spectroscopy (TDS) is a powerful characterization 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”, 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 that 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
Published date: 1 August 2020
Additional Information: Publisher Copyright: © 2020 OSA - The Optical Society. All rights reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

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 Jonathan Gorecki: ORCID iD orcid.org/0000-0001-9205-2294
ORCID for Nicholas, Thomas Klokkou: ORCID iD orcid.org/0000-0002-0999-3745
ORCID for Nikitas Papasimakis: ORCID iD orcid.org/0000-0002-6347-6466
ORCID for Vasileios Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191

Catalogue record

Date deposited: 29 May 2020 16:31
Last modified: 28 Apr 2021 04:01

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Contributors

Author: Nicholas, Thomas Klokkou ORCID iD
Author: Lewis, Kieran Piper
Author: Sakellaris Mailis

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