title: Extraordinary optical transmission inside a waveguide: spatial mode dependence.
abstract: We study the influence of the input spatial mode on the extraordinary optical transmission (EOT) effect. By placing a metal screen with a 1D array of subwavelength holes inside a terahertz (THz) parallel-plate waveguide (PPWG), we can directly compare the transmission spectra with different input waveguide modes. We observe that the transmitted spectrum depends strongly on the input mode. A conventional description of EOT based on the excitation of surface plasmons is not predictive in all cases. Instead, we utilize a formalism based on impedance matching, which accurately predicts the spectral resonances for both TEM and non-TEM input modes.
authors.forename: Kimberly S
authors.initials: KS
authors.lastname: Reichel
authors.forename: Peter Y
authors.initials: PY
authors.lastname: Lu
authors.forename: Sterling
authors.initials: S
authors.lastname: Backus
authors.forename: Rajind
authors.initials: R
authors.lastname: Mendis
authors.forename: Daniel M
authors.initials: DM
authors.lastname: Mittleman