title: High-contrast terahertz modulator based on extraordinary transmission through a ring aperture.
abstract: We demonstrated extraordinary THz transmission through ring apertures on a metal film. Transmission of 60% was obtained with an aperture-to-area ratio of only 1.4%. We show that the high transmission can be suppressed by over 18 dB with a thin layer of free carriers in the silicon substrate underneath the metal film. This result suggests that CMOS-compatible terahertz modulators can be built by controlling the carrier density near the aperture.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Shu
authors.forename: Ciyuan
authors.initials: C
authors.lastname: Qiu
authors.forename: Victoria
authors.initials: V
authors.lastname: Astley
authors.forename: Daniel
authors.initials: D
authors.lastname: Nickel
authors.forename: Daniel M
authors.initials: DM
authors.lastname: Mittleman
authors.forename: Qianfan
authors.initials: Q
authors.lastname: Xu
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D055096:Optical Devices; D013685:Telecommunications / Q000295:instrumentation*; D055053:Terahertz Radiation