SciTech Connect

Title: Terahertz metamaterials

Terahertz metamaterials In this paper we present our recent developments in terahertz (THz) metamaterials and devices. Planar THz metamaterials and their complementary structures fabricated on suitable substrates have shown electric resonant response, which causes the band-pass or band-stop property in THz transmission and reflection. The operational frequency can be further tuned up to 20% upon photoexcitation of an integrated semiconductor region in the splitring resonators as the metamaterial elements. On the other hand, the use of semiconductors as metamaterial substrates enables dynamical control of metamaterial resonances through photoexcitation, and reducing the substrate carrier lifetime further enables an ultrafast switching recovery. The metamaterial resonances can also be actively controlled by application of a voltage bias when they are fabricated on semiconductor substrates with appropriate doping concentration and thickness. Using this electrically driven approach, THz modulation depth up to 80% and modulation speed of 2 MHz at room temperature have been demonstrated, which suggests practical THz applications.
Authors: ; ; ;
Publication Date:
OSTI Identifier:OSTI ID: 956494
Report Number(s):LA-UR-09-00185; LA-UR-09-185
TRN: US201013%%193
DOE Contract Number:AC52-06NA25396
Resource Type:Journal Article
Research Org:Los Alamos National Laboratory (LANL)
Sponsoring Org:DOE
Country of Publication:United States
Language:English
Subject: 36; CARRIER LIFETIME; MODULATION; REFLECTION; RESONATORS; SUBSTRATES; THICKNESS; MATERIALS