title: Enhanced optical transmission through sub-wavelength centered-polygonal hole arrays in silver thin film on silica substrate.
abstract: We numerically investigated the enhanced optical transmission through sub-wavelength centered-polygonal hole arrays (CPHA) in a thin Ag film deposited on the silica substrate. In octagonal and decagonal-CPHAs, we observed new hybrid transmission characteristics that were inherited from both crystalline and quasi-crystalline hole arrays. This peculiar nature was attributed to the unique arrangement of CPHAs which can be covered with copies of a single unit cell as in crystalline arrays, and their rotational symmetry as observed in quasi-crystalline arrays. Hybrid natures in CPHAs were further investigated in the transmission spectra and Fourier space representations of the arrays. Contributions from the nearest neighbor hole-to-hole distance to enhanced transmission were analyzed in order to quantify the plasmonic contributions from the Air/Ag interface and Silica/Ag interface. We also investigated the impact of layer structure, Air/Ag/Air versus Air/Ag/Silica in the transmissions and found that in CPHAs in Air/Ag/Silica structures, contributions from the Air/Ag interface became dominant in contrast to crystalline hole arrays with lower fold symmetry.
authors.affiliation: Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University, Seoul, South Korea.
authors.forename: Hesam Edin
authors.initials: HE
authors.lastname: Arabi
authors.forename: Minkyu
authors.initials: M
authors.lastname: Park
authors.forename: Marzieh
authors.initials: M
authors.lastname: Pournoury
authors.forename: Kyunghwan
authors.initials: K
authors.lastname: Oh
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008567:Membranes, Artificial; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D008567:Membranes, Artificial; D012834:Silver; D012822:Silicon Dioxide