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

作者：Karl N^*; Reichel K; Chen H T; Taylor A J; Brener I; Benz A; Reno J L; Mendis R; Mittleman D M

来源：Applied Physics Letters, 2014, 104(9): 091115.

DOI：10.1063/1.4867276

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.

• 出版日期2014-3-3