title: Infrared polarizer employing multiple metal-film subwavelength gratings.
abstract: A multiple thin metal-film subwavelength grating is proposed for polarizers in the infrared wavelength region of 10-20 μm. The dependence of the transmission characteristics of the polarizers on structural parameters was obtained numerically, and the potential for high performance was confirmed experimentally. The measured TE-wave losses in a polarizer comprising a triangular triple Al-film grating are more than 45 and 35 dB for the wavelength ranges of 10-16 and 16-20 μm, respectively, while the net TM-wave losses are lower than 1.5 dB in the wavelength rage of 15-20 μm.
authors.affiliation: Graduate School of Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan. kazuos@cc.utsunomiya-u.ac.jp
authors.forename: Kazuo
authors.initials: K
authors.lastname: Shiraishi
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Yoda
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D008567:Membranes, Artificial; D008670:Metals / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*
chemical_list: D008567:Membranes, Artificial; D008670:Metals