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Title: Volatile ultrafast switching at multilevel nonvolatile states of phase change material for active flexible terahertz metadevices
Authors: Pitchappa, Prakash
Kumar, Abhishek
Prakash, Saurav
Jani, Hariom
Medwal, Rohit
Mishra, Mayank
Rawat, Rajdeep Singh
Venkatesan, Thirumalai
Wang, Nan
Singh, Ranjan
Keywords: Science::Physics
Issue Date: 2021
Source: Pitchappa, P., Kumar, A., Prakash, S., Jani, H., Medwal, R., Mishra, M., Rawat, R. S., Venkatesan, T., Wang, N. & Singh, R. (2021). Volatile ultrafast switching at multilevel nonvolatile states of phase change material for active flexible terahertz metadevices. Advanced Functional Materials, 31(17), 2100200-.
Project: RG191/17
Journal: Advanced Functional Materials
Abstract: Phase change materials provide unique reconfigurable properties for photonic applications that mainly arise from their exotic characteristic to reversibly switch between the amorphous and crystalline nonvolatile phases. Optical pulse based reversible switching of nonvolatile phases is exploited in various nanophotonic devices. However, large area reversible switching is extremely challenging and has hindered its translation into a technologically significant terahertz spectral domain. Here, this limitation is circumvented by exploiting the semiconducting nature of germanium antimony telluride (GST) to achieve dynamic terahertz control at picosecond timescales. It is also shown that the ultrafast response can be actively altered by changing the crystallographic phase of GST. The ease of fabrication of phase change materials allows for the realization of a variable ultrafast terahertz modulator on a flexible platform. The rich properties of phase change materials combined with the diverse functionalities of metamaterials and all-optical ultrafast control enables an ideal platform for design of efficient terahertz communication devices, terahertz neuromorphic photonics, and smart sensor systems.
ISSN: 1616-301X
DOI: 10.1002/adfm.202100200
Schools: School of Physical and Mathematical Sciences 
National Institute of Education 
Organisations: Institute of Microelectronics, A*STAR
Research Centres: The Photonics Institute 
Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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