Frequency-Agile Temporal Terahertz Metamaterials

Frequency-Agile Temporal Terahertz Metamaterials
Frequency-Agile Temporal Terahertz Metamaterials
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Advanced Optical Materials
Publication Date:
08 April 2020
Spatiotemporal manipulation of electromagnetic waves has recently enabled a new world of exotic optical functionalities, such as non-reciprocity, dynamic wavefront control, unidirectional transmission, linear frequency conversion and electromagnetic Doppler cloak. We introduce an additional dimension for advanced manipulation of terahertz waves in the space-time, and frequency domains through integration of spatially reconfigurable microelectromechanical systems with photoresponsive material platform. A large and continuous frequency agility is achieved through movable microcantilevers. The ultrafast resonance modulation occurs upon photoexcitation of ion-irradiated silicon substrate that hosts the microcantilever metamaterial. The fabricated metamaterial switches in 400 ps and provides large spectral tunability of 250 GHz with 100% resonance modulation at each frequency. The integration of perfectly complementing technologies of microelectromechanical systems, femtosecond optical control and ion-irradiation offer unprecedented concurrent control over space, time and frequency response of metamaterial for designing frequency-agile spatiotemporal modulators, active beamforming and low-power frequency converters for the next generation terahertz wireless communications.
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Funding Info:
The authors acknowledge the research funding support from National Research Foundation (NRF) Singapore and Agence Nationale de la Recherche (ANR), France- NRF2016- ANR004 (M4197003), NRF CRP on Oxide Electronics on silicon Beyond Moore (NRF-CRP15-2015- 01) and Advanced Manufacturing and Engineering (AME) Programmatic grant (A18A5b0056) from Agency for Science, Technology and Research (A*STAR).
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