title: Design and fabrication of an achromatic infrared wave plate with Sb-Ge-Sn-S system chalcogenide glass.
abstract: We designed and fabricated an achromatic infrared wave plate. To examine its phase retardation characteristics, the birefringence was calculated using the effective medium theory. A wave plate with a subwavelength grating was fabricated by direct imprint lithography on a low toxic chalcogenide glass (Sb-Ge-Sn-S system) based on calculated results. As a result of imprinting onto chalcogenide glass by a glassy carbon mold, a grating with 1.63 μm depth, a fill factor of 0.7, and a 3 μm period was obtained. The phase retardation of the elements reached around 30° in the 8.5-10.5 μm wavelength range. The fabrication of the infrared wave plate is less costly compared with conventional crystalline wave plates.
authors: Department of Electronic Systems Engineering, School of Engineering, University of Shiga Prefecture, Hikone, Shiga, Japan. yamada.i@e.usp.ac.jp
authors: Itsunari
authors: I
authors: Yamada
authors: Naoto
authors: N
authors: Yamashita
authors: Toshihiko
authors: T
authors: Einishi
authors: Mitsunori
authors: M
authors: Saito
authors: Kouhei
authors: K
authors: Fukumi
authors: Junji
authors: J
authors: Nishii