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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 Metamaterials Non-volatile photonics Photonics Terahertz 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 | Source Title: | ADVANCED MATERIALS | URI: | https://scholarbank.nus.edu.sg/handle/10635/168497 | ISSN: | 09359648 |
Appears in Collections: | Staff Publications Elements |
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Chalcogenide Phase Change Material for Active Terahertz Photonics.pdf | 3.1 MB | Adobe PDF | OPEN | None | View/Download |
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