title: Achromatic THz wave plate composed of stacked parallel metal plates.
abstract: We propose a simple achromatic terahertz wave plate composed of stacked parallel metal plates with a hole array. It consists of an ensemble of designed parallel plate waveguides; the high and low propagation speeds of waves in TE and TM waveguide modes with the same group velocity cause a constant phase difference over a wide frequency region. Using that wave plate, we obtained intense single- and multi-cycle THz pulses with circular polarization.
authors.forename: Masaya
authors.initials: M
authors.lastname: Nagai
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Mukai
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Minowa
authors.forename: Masaaki
authors.initials: M
authors.lastname: Ashida
authors.forename: Jun
authors.initials: J
authors.lastname: Takayanagi
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Ohtake