title: Optical transmission of corrugated metal films on a two-dimensional hetero-colloidal crystal.
abstract: The near infrared transmission of corrugated metal films deposited on hetero-colloidal crystals is investigated. The transmission response of the quasi-three-dimensional (quasi-3D) metal film is modified by controlling the nominal thickness of a dielectric layer pre-deposited on the top surface of the colloidal crystal to form a new hetero-colloidal crystal. An extraordinary optical transmission (EOT) phenomenon could be presented in such metallodielectric (MD) architectures. We have found that the main transmission peak is suppressed as the thickness of the intercalated dielectric layer is increased. We propose that the observed EOT is a result of constructive interference between a localized sphere-like plasmon mode and an index-guided eigen mode mainly confined in the colloidal crystal, which is confirmed by our numerical simulations. Based on the MD microstructures, a distinct plasmon sensitivity response difference is achieved, which indicates potential applications for biochemical sensing.
authors.affiliation: Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China.
authors.forename: Zhengqi
authors.initials: Z
authors.lastname: Liu
authors.forename: Jinting
authors.initials: J
authors.lastname: Hang
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Zhendong
authors.initials: Z
authors.lastname: Yan
authors.forename: Chaojun
authors.initials: C
authors.lastname: Tang
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Chen
authors.forename: Peng
authors.initials: P
authors.lastname: Zhan
mesh_terms: D015374:Biosensing Techniques; D003102:Colloids; D003460:Crystallization; D006046:Gold; D008670:Metals; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D055620:Optical Phenomena; D012822:Silicon Dioxide; D019265:Spectroscopy, Near-Infrared; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D003102:Colloids; D008670:Metals; D006046:Gold; D012822:Silicon Dioxide