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Title: Chalcogenide Phase Change Material for Active Terahertz Photonics
Authors: Pitchappa, Prakash 
Kumar, Abhishek 
Prakash, Saurav 
Jani, Hariom 
Venkatesan, Thirumalai 
Singh, Ranjan
Keywords: Germanium antimony telluride
Non-volatile photonics
Ultrafast modulators
Issue Date: 27-Jan-2019
Publisher: Wiley-VCH Verlag
Citation: Pitchappa, Prakash, Kumar, Abhishek, Prakash, Saurav, Jani, Hariom, Venkatesan, Thirumalai, Singh, Ranjan (2019-01-27). Chalcogenide Phase Change Material for Active Terahertz Photonics. ADVANCED MATERIALS 31 (12). ScholarBank@NUS Repository.
Abstract: The strikingly contrasting optical properties of various phases of chalcogenide phase change materials (PCM) has recently led to the development of novel photonic devices such as all-optical non-von Neumann memory, nanopixel displays, color rendering, and reconfigurable nanoplasmonics. However, the exploration of chalcogenide photonics is currently limited to optical and infrared frequencies. Here, a phase change material integrated terahertz metamaterial for multilevel nonvolatile resonance switching with spatial and temporal selectivity is demonstrated. By controlling the crystalline proportion of the PCM film, multilevel, non-volatile, terahertz resonance switching states with long retention time at zero hold power are realized. Spatially selective reconfiguration at sub-metamaterial scale is shown by delivering electrical stimulus locally through designer interconnect architecture. The PCM metamaterial also features ultrafast optical modulation of terahertz resonances with tunable switching speed based on the crystalline order of the PCM film. The multilevel nonvolatile, spatially selective, and temporally tunable PCM metamaterial will provide a pathway toward development of novel and disruptive terahertz technologies including spatio-temporal terahertz modulators for high speed wireless communication, neuromorphic photonics, and machine-learning metamaterials. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN: 09359648
Appears in Collections:Staff Publications

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