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

作者：N. Karl, Kimberly S. Reichel, Houtong Chen, A. Taylor, I. Brener, A. Benz, J. Reno, R. Mendis, D. Mittleman · 年份：2014 · DOI：10.1063/1.4867276 · 被引用次数：91 · 研究领域：Materials Science

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.