title: Compact middle-wave infrared Fabry-Perot interferometer with double metallic subwavelength gratings.
abstract: We demonstrate a compact middle-wave IR (MWIR) Fabry-Perot (FP) interferometer by replacing the traditional distributed Bragg reflectors consisting of thick multilayer films with two identical metallic subwavelength gratings. The transmission efficiency, resonance peak position, and finesse of the FP interferometer can be controlled by tuning the structural parameters. The performance of the MWIR FP interferometer is verified by experiment, which shows its potential application as, for example, narrowband MWIR filter for gas detection.
authors.affiliation: Department of Physics and Mathematics, University of Eastern Finland (Joensuu Campus), Joensuu, Finland. guoguo.kang@uef.fi
authors.forename: Guoguo
authors.initials: G
authors.lastname: Kang
authors.forename: Ismo
authors.initials: I
authors.lastname: Vartiainen
authors.forename: Benfeng
authors.initials: B
authors.lastname: Bai
authors.forename: Pertti
authors.initials: P
authors.lastname: Pääkkönen
authors.forename: Jari
authors.initials: J
authors.lastname: Turunen