title: Broadband infrared mirror using guided-mode resonance in a subwavelength germanium grating.
abstract: We demonstrate a broadband mirror for the IR wavelength region comprising a subwavelength grating made of germanium. We design and optimize the guided-mode resonances in the structure for TM-polarized incident light by rigorous electromagnetic simulations. The grating structure is realized by nanoimprint lithography and dry etching. The reflectivity of the mirror is over 95% for the wavelength range between 2245 and 3080nm.
authors.affiliation: Optoelectronics Research Centre, Tampere University of Technology, P.O. Box 692, FIN-33101, Tampere, Finland. juha.kontio@tut.fi
authors.forename: Juha M
authors.initials: JM
authors.lastname: Kontio
authors.forename: Janne
authors.initials: J
authors.lastname: Simonen
authors.forename: Kari
authors.initials: K
authors.lastname: Leinonen
authors.forename: Markku
authors.initials: M
authors.lastname: Kuittinen
authors.forename: Tapio
authors.initials: T
authors.lastname: Niemi