title: Polarization-independent active metamaterial for high-frequency terahertz modulation.
abstract: We present a polarization-independent metamaterial design for the construction of electrically tunable terahertz (THz) devices. The implemented structure consists of an array of gold crosses fabricated on top of an n-doped gallium arsenide (GaAs) layer. Utilizing THz time-domain spectroscopy, we show that the electric resonance and thus the transmission properties of the cross structure can be tuned by an externally applied bias voltage. We further demonstrate the fast amplitude modulation of a propagating THz wave for modulation frequencies up to 100 kHz.
authors.affiliation: Department of Physics, University of Kaiserslautern, Germany. paul@physik.uni-kl.de
authors.forename: Oliver
authors.initials: O
authors.lastname: Paul
authors.forename: Christian
authors.initials: C
authors.lastname: Imhof
authors.forename: Bert
authors.initials: B
authors.lastname: Lägel
authors.forename: Sandra
authors.initials: S
authors.lastname: Wolff
authors.forename: Jan
authors.initials: J
authors.lastname: Heinrich
authors.forename: Sven
authors.initials: S
authors.lastname: Höfling
authors.forename: Alfred
authors.initials: A
authors.lastname: Forchel
authors.forename: Remigius
authors.initials: R
authors.lastname: Zengerle
authors.forename: René
authors.initials: R
authors.lastname: Beigang
authors.forename: Marco
authors.initials: M
authors.lastname: Rahm