title: Effect of a thin dielectric layer on terahertz transmission characteristics for metal hole arrays.
abstract: We studied the role of surface-plasmon polaritons (SPPs) in a bandpass transmission property of two-dimensional metal hole arrays (2D-MHAs) by investigating the effect of thin dielectric layers on the 2D-MHA surfaces. We measured zero-order transmission spectra of the 2D-MHAs by changing the thickness of the dielectric layer and found that the bandpass transmission peak shifted to the lower-frequency side with increasing layer thickness, owing to the change of the resonant frequency of the SPP. This result shows that SPPs play a crucial role in the transmission property of 2D-MHAs in the terahertz region.
authors.affiliation: Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan. mtanaka@ile.osaka-u.ac.jp
authors.forename: Masaki
authors.initials: M
authors.lastname: Tanaka
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Miyamaru
authors.forename: Masanori
authors.initials: M
authors.lastname: Hangyo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Tanaka
authors.forename: Masamichi
authors.initials: M
authors.lastname: Akazawa
authors.forename: Eiichi
authors.initials: E
authors.lastname: Sano