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

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dc.contributor.authorHan, Molong
dc.contributor.authorSmith, Daniel
dc.contributor.authorHock Ng, Soon
dc.contributor.authorVilagosh, Zoltan
dc.contributor.authorAnand, Vijayakumar
dc.contributor.authorKatkus, Tomas
dc.contributor.authorReklaitis, Ignas
dc.contributor.authorMu, Haoran
dc.contributor.authorRyu, Meguya
dc.contributor.authorMorikawa, Junko
dc.contributor.authorVongsvivut, Jitraporn
dc.contributor.authorAppadoo, Dominique
dc.contributor.authorJuodkazis, Saulius
dc.date.accessioned2024-03-28T07:41:01Z
dc.date.available2024-03-28T07:41:01Z
dc.date.issued2022
dc.description.abstractTHz 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 cm−1, high finesse Fc≈17, 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.
dc.identifier.urihttps://doi.org/10.3390%2Fmi13081170
dc.identifier.urihttps://hdl.handle.net/10062/97408
dc.language.isoen
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/857627///CIPHR
dc.relation.ispartofMicromachines 2022, 13(8)
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectTHz filters
dc.subjectsynchrotron infrared
dc.subjectanisotropy
dc.titleTHz Filters Made by Laser Ablation of Stainless Steel and Kapton Film
dc.typeinfo:eu-repo/semantics/articleen

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