Spectral filter was proposed and polarisation analysis was carried out on THz-synchrotron beam

Spectral filter was proposed and polarisation analysis was carried out on THz-synchrotron beam

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物質理工学院 森川淳子教授Saulius Juodkazis特任教授の共著論文

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

が、Micromachines に掲載されました。(DOI: 10.3390/mi13081170

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<Abstract>

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.