Terahertz dielectric characterisation of fibres in a time-domain spectrometer

• Autorzy: Pacewicz Adam , Kopyt Paweł , Cuper Jerzy , Krysicki Mateusz , Salski Bartłomiej

Identyfikatory

DOI

10.24425/opelre.2023.144596

• Konferencja: Free Electrons Laser Applications in Infrared and THz Studies of New States of Matter - TERFEL : International Conference 2022 (5-8 July, 2022 ; Warszawa, Poland)
• Języki publikacji: EN

Abstrakty

EN

An innovative measurement setup for the dielectric characterisation of fibres in a terahertz time-domain spectrometer using an HDPE elliptical lens for coupling into the fibres has been built and validated by measurements of several different types of samples. The setup is based on a commercial all fibre-coupled terahertz time-domain spectrometer. Measurements of the effective refractive index have been conducted on polypropylene-based three-dimensional printing filaments, silica glass rods, and a polytetrafluoroethylene cord of lowered density, covering the frequency range of approximately 100 GHz to 1 THz. The theoretical part of the work includes numerical calculations performed via the finite difference eigenmode method and the characteristic equations of a uniform circular dielectric waveguide for a few guided modes, from which it is clear that primarily the fundamental mode propagates along the fibre. Details on model-based phase corrections, crucial to the accurate determination of the effective refractive index of dispersive fibres, have been presented as well.

Słowa kluczowe

EN

terahertz spectroscopy; fibre characterisation; dielectric materials

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2023
• Tom: Vol. 31, No. 2
• Strony: art. no. e144596
• Opis fizyczny: Bibliogr. 27 poz., rys., tab., wykr.

Twórcy

autor

Pacewicz Adam

• Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland

• https://orcid.org/0000-0002-3925-1355

autor

Kopyt Paweł

• Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland

• https://orcid.org/0000-0002-0481-9035

autor

Cuper Jerzy

• Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland

• https://orcid.org/0000-0002-8143-5297

autor

Krysicki Mateusz

• Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland

• https://orcid.org/0000-0001-6481-8870

autor

Salski Bartłomiej

• Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland

• https://orcid.org/0000-0002-0376-7667

Bibliografia

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Uwagi

1. Scientific work financed from budget funds for science in 2017–2020 as a research project under the "Diamond Grant" program, project number DI 2016 021146. The authors would like to thank Mr. Piotr Chmielewski (Warsaw University of Technology) for manufacturing the lens.

2. Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).