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 gr...

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Bibliographic Details
Published in:Applied physics letters 2014-03, Vol.104 (9)
Main Authors: Karl, N., Reichel, K., Chen, H.-T., Taylor, A. J., Brener, I., Benz, A., Reno, J. L., Mendis, R., Mittleman, D. M.
Format: Article
Language:English
Subjects:
Applied physics
Columns (structural)
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DESIGN
DIFFRACTION
DIFFRACTION GRATINGS
Dynamic range
ELECTRIC POTENTIAL
Gratings (spectra)
Metamaterials
MODULATION
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
RESONATORS
THZ RANGE
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4867276