title: Terahertz transparency at Fabry-Perot resonances of periodic slit arrays in a metal plate: experiment and theory.
abstract: We report on a perfect transmission in one-dimensional metallic structure using time-domain terahertz spectroscopy. Fabry-Perot resonance appearing in spectral region below first Rayleigh minimum strongly enhances transmission up to over ninety-nine percent. Theoretical calculations reveal that under the perfect transmission condition, a symmetric eigenmode inside the slits is excited and a funneling of all incident energy onto the slits occurs, resulting in large energy concentration equivalent to the inverse sample coverage and high near-field enhancement of electric and magnetic field intensities. Our work opens way toward near-field terahertz amplification, applicable to high-field terahertz spectroscopy.
authors.forename: J W
authors.initials: JW
authors.lastname: Lee
authors.forename: M A
authors.initials: MA
authors.lastname: Seo
authors.forename: D J
authors.initials: DJ
authors.lastname: Park
authors.forename: S C
authors.initials: SC
authors.lastname: Jeoung
authors.forename: Q H
authors.initials: QH
authors.lastname: Park
authors.forename: Ch
authors.initials: Ch
authors.lastname: Lienau
authors.forename: D S
authors.initials: DS
authors.lastname: Kim