Please use this identifier to cite or link to this item: https://doi.org/10.1002/adfm.202100200
Title: Volatile Ultrafast Switching at Multilevel Nonvolatile States of Phase Change Material for Active Flexible Terahertz Metadevices
Authors: Prakash Pitchappa 
Abhishek Kumar
Saurav Prakash 
Hariom Jani 
Rohit Medwal
Mayank Mishra
Rajdeep Singh Rawat
Thirumalai Venkatesan:rp04303 
Nan Wang
Ranjan Singh
Keywords: multifunctional metamaterials
optical control
phase change materials
reconfigurable metadevices
terahertz
Issue Date: 22-Feb-2021
Publisher: WILEY
Citation: Prakash Pitchappa, Abhishek Kumar, Saurav Prakash, Hariom Jani, Rohit Medwal, Mayank Mishra, Rajdeep Singh Rawat, Thirumalai Venkatesan:rp04303, Nan Wang, Ranjan Singh (2021-02-22). Volatile Ultrafast Switching at Multilevel Nonvolatile States of Phase Change Material for Active Flexible Terahertz Metadevices. Advanced Functional Materials. ScholarBank@NUS Repository. https://doi.org/10.1002/adfm.202100200
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.
Source Title: Advanced Functional Materials
URI: https://scholarbank.nus.edu.sg/handle/10635/189229
ISSN: 16163028
DOI: 10.1002/adfm.202100200
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