IRFI 東京工業大学国際先駆研究機構



【論文】WRH森川淳子教授とSaulius Juodkazis特任教授の共著論文“THz Filters Made by Laser Ablation of Stainless Steel and Kapton Film”が掲載されました。

物質理工学院 森川淳子教授Saulius Juodkazis特任教授の共著論文が、Micromachines に掲載されました。

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

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=30tilt. 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.




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