Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4867276
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Funding
- National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1101171] Funding Source: National Science Foundation
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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. (C) 2014 AIP Publishing LLC.
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