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Title: An electrically driven terahertz metamaterial diffractive modulator with more than 20 dB of dynamic range

We design and experimentally demonstrate a switchable diffraction grating for terahertz modulation based on planar active metamaterials, where a Schottky gate structure is implemented to tune the metamaterial resonances in real-time via the application of an external voltage bias. The diffraction grating is formed by grouping the active split-ring resonators into an array of independent columns with alternate columns biased. We observe off-axis diffraction over a wide frequency band in contrast to the narrow-band resonances, which permits operation of the device as a relatively high-speed, wide-bandwidth, high-contrast modulator, with more than 20 dB of dynamic range.
Authors:
; ; ;  [1] ; ;  [2] ; ; ;  [3]
  1. Department of Electrical and Computer Engineering, Rice University, MS 378, Houston, Texas 77251-1892 (United States)
  2. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, P. O. Box 1663, MS K771, Los Alamos, New Mexico 87545 (United States)
  3. Center for Integrated Nanotechnologies, Sandia National Laboratories, P. O. Box 5800, MS 1082, Albuquerque, New Mexico 87185 (United States)
Publication Date:
OSTI Identifier:
22283062
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; DESIGN; DIFFRACTION; DIFFRACTION GRATINGS; ELECTRIC POTENTIAL; MODULATION; NANOSTRUCTURES; RESONATORS; THZ RANGE