Electrically Tunable All-PCM Visible Plasmonics

Kandammathe Valiyaveedu Sreekanth; Rohit Medwal; Chandreyee M Das; Manoj Gupta; Mayank Mishra; Ken-Tye Yong; Rajdeep Singh Rawat; Ranjan Singh

doi:10.1021/acs.nanolett.1c00941

Electrically Tunable All-PCM Visible Plasmonics

Nano Lett. 2021 May 12;21(9):4044-4050. doi: 10.1021/acs.nanolett.1c00941. Epub 2021 Apr 26.

Authors

Kandammathe Valiyaveedu Sreekanth^{1

2}, Rohit Medwal³, Chandreyee M Das^{4

5}, Manoj Gupta^{1

2}, Mayank Mishra³, Ken-Tye Yong^{6

7}, Rajdeep Singh Rawat³, Ranjan Singh^{1

2}

Affiliations

¹ Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.
² Centre for Disruptive Photonic Technologies, The Photonic Institute, 50 Nanyang Avenue, Singapore 639798, Singapore.
³ Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore.
⁴ School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.
⁵ CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, 50 Nanyang Drive, Nanyang Technological University, Singapore, 637553, Singapore.
⁶ School of Biomedical Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia.
⁷ The University of Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, Australia.

PMID: 33900781
DOI: 10.1021/acs.nanolett.1c00941

Abstract

The realization of electrically tunable plasmonic resonances in the ultraviolet (UV) to visible spectral band is particularly important for active nanophotonic device applications. However, the plasmonic resonances in the UV to visible wavelength range cannot be tuned due to the lack of tunable plasmonic materials. Here, we experimentally demonstrate tunable plasmonic resonances at visible wavelengths using a chalcogenide semiconductor alloy such as antimony telluride (Sb₂Te₃), by switching the structural phase of Sb₂Te₃ from amorphous to crystalline. We demonstrate the excitation of a propagating surface plasmon with a high plasmonic figure of merit in both amorphous and crystalline phases of Sb₂Te₃ thin films. We show polarization-dependent and -independent plasmonic resonances by fabricating one and two-dimensional periodic nanostructures in Sb₂Te₃ thin films, respectively. Moreover, we demonstrate electrically tunable plasmonic resonances using a microheater integrated with the Sb₂Te₃/Si device. The developed electrically tunable Sb₂Te₃-based plasmonic devices could find applications in the development of active color filters.

Keywords: Chalcogenide phase change material; Electrical control of visible plasmonics; Metasurfaces; Microheaters; Plasmonics.