Spectral singularities and asymmetric light scattering in PT-symmetric 2D nanoantenna arrays

Tapar, Jinal and Kishen, Saurabh and Emani, Naresh Kumar (2020) Spectral singularities and asymmetric light scattering in PT-symmetric 2D nanoantenna arrays. Optics Letters, 45 (18). pp. 5185-5188. ISSN 0146-9592

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The intriguing physics of non-Hermitian systems satisfying parity-time (PT) symmetry has spurred a surge of both theoretical and experimental research in interleaved gain-loss systems for novel photonic devices. In this work, we investigate vertically stacked GaInP PT-symmetric nanodisk resonators arranged in two-dimensional periodic lattice using full-wave numerical simulations and scattering matrix theory. The proposed dielectric metasurface supports lasing spectral singularities with asymmetric reflection and highly anisotropic far-field scattering patterns. It offers a much broader design parameter space to control wavelength, scattering direction, and efficiency of optical emission when compared to the predominantly one-dimentional (1D) or quasi-1D structures studied so far. The proposed system with Q-factor >105 serves as a powerful platform for enhanced light-matter interaction by enabling extensive control of asymmetric light scattering, amplification, and unprecedented localization of electromagnetic fields. © 2020 Optical Society of America

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IITH Creators:
IITH CreatorsORCiD
Emani, Naresh Kumarhttps://orcid.org/0000-0002-0488-921X
Item Type: Article
Additional Information: Science and Engineering Research Board (ECR/2018/002452, SB/S2/RJN-007/2017); Ministry of Human Resource Development (STARS/APR2019/NS/774).
Uncontrolled Keywords: Electromagnetic fields; Gallium alloys; Lattice theory; Nanoantennas; Photonic devices; Q factor measurement; Semiconductor alloys
Subjects: Others > Nanotechnology
Others > Optical design & engineering
Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 23 Nov 2022 07:07
Last Modified: 23 Nov 2022 07:07
URI: http://raiith.iith.ac.in/id/eprint/11335
Publisher URL: https://doi.org/10.1364/OL.398551
OA policy: https://v2.sherpa.ac.uk/id/publication/13362
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