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Article

THz Filters Made by Laser Ablation of Stainless Steel and Kapton Film

1
Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
2
Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, VIC 3168, Australia
3
Australian Centre for Electromagnetic Bioeffects Research, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
4
Institute of Physics, University of Tartu, 50411 Tartu, Estonia
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Institute of Photonics and Nanotechnology, Vilnius University, Saulėtekio Ave. 3, 10257 Vilnius, Lithuania
6
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 3, 1-1-1 Umezono, Tsukuba 305-8563, Japan
7
WRH Program International Research Frontiers Initiative (IRFI) Tokyo Institute of Technology, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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CREST-JST and School of Materials and Chemical Technology, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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ANSTO—Australian Synchrotron, Infrared Microspectroscopy (IRM) Beamline, 800 Blackburn Road, Clayton, VIC 3168, Australia
10
ANSTO—Australian Synchrotron, THz/Far-IR Beamline, 800 Blackburn Road, Clayton, VIC 3168, Australia
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Dmitri V. Lioubtchenko
Micromachines 2022, 13(8), 1170; https://doi.org/10.3390/mi13081170
Received: 30 June 2022 / Revised: 18 July 2022 / Accepted: 19 July 2022 / Published: 25 July 2022
THz band-pass filters were fabricated by femtosecond-laser ablation of 25-μm-thick micro-foils of stainless steel and Kapton film, which were subsequently metal coated with a ∼70 nm film, closely matching the skin depth at the used THz spectral window. Their spectral performance was tested in transmission and reflection modes at the Australian Synchrotron’s THz beamline. A 25-μm-thick Kapton film performed as a Fabry–Pérot etalon with a free spectral range (FSR) of 119 cm1, high finesse Fc17, and was tuneable over ∼10μm (at ∼5 THz band) with β=30 tilt. The structure of the THz beam focal region as extracted by the first mirror (slit) showed a complex dependence of polarisation, wavelength and position across the beam. This is important for polarisation-sensitive measurements (in both transmission and reflection) and requires normalisation at each orientation of linear polarisation. View Full-Text
Keywords: THz filters; synchrotron infrared; anisotropy THz filters; synchrotron infrared; anisotropy
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MDPI and ACS Style

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. https://doi.org/10.3390/mi13081170

AMA Style

Han M, Smith D, Ng SH, 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(8):1170. https://doi.org/10.3390/mi13081170

Chicago/Turabian Style

Han, Molong, Daniel Smith, Soon Hock Ng, Zoltan Vilagosh, Vijayakumar Anand, Tomas Katkus, Ignas Reklaitis, Haoran Mu, Meguya Ryu, Junko Morikawa, Jitraporn Vongsvivut, Dominique Appadoo, and Saulius Juodkazis. 2022. "THz Filters Made by Laser Ablation of Stainless Steel and Kapton Film" Micromachines 13, no. 8: 1170. https://doi.org/10.3390/mi13081170

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