THz Filters made by Laser Ablation of Stainless Steel and Kapton

Molong Han; Daniel Smith; Soon Hock Ng; Zoltan Vilagosh; Vijayakumar Anand; Tomas Katkus; Ignas Reklatis; Haoran Mu; Meguya Ryu; Junko Morikawa; Jitraport Vongsvivut; Dominique Appadoo; Saulius Juodkazis

doi:10.20944/preprints202207.0043.v1

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preprints.org > chemistry and materials science > surfaces, coatings and films > doi: 10.20944/preprints202207.0043.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

THz Filters made by Laser Ablation of Stainless Steel and Kapton

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Version 1 : Received: 30 June 2022 / Approved: 4 July 2022 / Online: 4 July 2022 (09:26:05 CEST)

A peer-reviewed article of this Preprint also exists.

Han, M.; Smith, D.; Ng, S.H.; Vilagosh, Z.; Anand, V.; Katkus, T.; Reklaitis, I.; Mu, H.; Ryu, M.; Morikawa, J.; Vongsvivut, J.; Appadoo, D.; Juodkazis, S. THz Filters Made by Laser Ablation of Stainless Steel and Kapton Film. Micromachines 2022, 13, 1170. Han, M.; Smith, D.; Ng, S.H.; Vilagosh, Z.; Anand, V.; Katkus, T.; Reklaitis, I.; Mu, H.; Ryu, M.; Morikawa, J.; Vongsvivut, J.; Appadoo, D.; Juodkazis, S. THz Filters Made by Laser Ablation of Stainless Steel and Kapton Film. Micromachines 2022, 13, 1170.

Abstract

THz band-pass filters were fabricated by laser ablation of micro-foils of stainless steel and Kapton. Their spectral performance was tested in transmission and re- flection at the THz beamline at the Australian Synchrotron (AuSy). A 25 μm Kapton film performed as a Fabry-Pérot etalon with a free spectral range of FSR = 119 cm−1, high finesse Fc ≈ 17, and was tuneable over ~10 μm (at ~5 THz band) with β = 30° tilt. The structure of the THz beam focal region as extracted by the first mirror (slit) shows a complex polarisation-wavelength- position dependence across the beam. This is important for polarisation sensitive measurements (in transmission and reflection) and requires normalisation at each orientation of linear polarisation.

Keywords

THz filters; Synchrotron

Subject

Chemistry and Materials Science, Surfaces, Coatings and Films

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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