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

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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