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Title: Tunable nanostructured composite with built-in metallic wire-grid electrode

In this paper, the authors report an experimental demonstration of microwave reflection tuning in carbon nanostructure-based composites by means of an external voltage supplied to the material. DC bias voltages are imparted through a metal wire-grid. The magnitude of the reflection coefficient is measured upon oblique plane-wave incidence. Increasing the bias from 13 to 700 V results in a lowering of ∼20 dB, and a “blueshift” of ∼600 MHz of the material absorption resonance. Observed phenomena are ascribed to a change of the dielectric response of the carbon material. Inherently, the physical role of tunneling between nanofillers (carbon nanotubes) is discussed. Achievements aim at the realization of a tunable absorber. There are similar studies in literature that focus on tunable metamaterials operating at either optical or THz wavelengths.
Authors:
; ;  [1] ;  [2]
  1. Department of Astronautics, Electrical and Energy Engineering, University of Rome Sapienza Via Eudossiana, 18, 00184 – Rome (Italy)
  2. Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Paint Branch Drive, MD-20740 (United States)
Publication Date:
OSTI Identifier:
22251788
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 3; Journal Issue: 11; Other Information: (c) 2013 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; CARBON NANOTUBES; ELECTRIC POTENTIAL; TUNNEL EFFECT; WAVELENGTHS