Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

THz Filters made by Laser Ablation of Stainless Steel and Kapton

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.

Journal reference: Micromachines 2022, 13, 1170
DOI: 10.3390/mi13081170

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

MATERIALS SCIENCE, Surfaces, Coatings & Films

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