Synthetic plasmonic nanocircuits and the evolution of their correlated spatial arrangement and resonance spectrum

Zhan, Y, Zhang, L, Rahmani, M ORCID: https://orcid.org/0000-0001-9268-4793, Giannini, V, Miroshnichenko, AE, Hong, M, Li, X, Maier, SA and Lei, D, 2021. Synthetic plasmonic nanocircuits and the evolution of their correlated spatial arrangement and resonance spectrum. ACS Photonics, 8 (1), pp. 166-174. ISSN 2330-4022

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Abstract

Optical nanocircuits, inspired by electrical nanocircuits, provide a versatile platform for tailoring and manipulating optical fields at the subwavelength scale, which is vital for developing various innovative optical nanodevices and integrated nanosystems. Plasmonic nanoparticles can be employed as promising building blocks for optical nanocircuits with unprecedentedly high integration capacity. Among various plasmonic systems, aggregated metallic nanoparticle, known as oligomers, possess great potential in constructing functional metatronic circuits. Here, the optical nanocircuits comprising special plasmonic oligomers, such as trimers with D3h symmetry, quadrumers with D2h symmetry, and their variants with reduced symmetry, are systematically investigated in the metatronic paradigm, both theoretically and experimentally. Our proposed circuit models, based on the displacement current in the oligomers, not only reproduce the resonance spectral details, but also retrieve many hidden physical quantities associated with their optical responses. Guided by the metatronic circuits, the spectral engineering of the oligomers with reduced geometric symmetry is predicted, and subgroup decomposition of several plasmonic quadrumers is examined. Our investigation has revealed a close correlation between the metatronic circuitry and strongly coupled plasmonic oligomers. The observed correlation of spatial arrangement and frequency response in oligomers provides a metatronic guide to modulate plasmonic responses via geometric variation.

Item Type:	Journal article
Publication Title:	ACS Photonics
Creators:	Zhan, Y., Zhang, L., Rahmani, M., Giannini, V., Miroshnichenko, A.E., Hong, M., Li, X., Maier, S.A. and Lei, D.
Publisher:	American Chemical Society
Date:	20 January 2021
Volume:	8
Number:	1
ISSN:	2330-4022
Identifiers:	Number Type 10.1021/acsphotonics.0c01756 DOI 1405664 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	18 Mar 2021 00:09
Last Modified:	23 Dec 2021 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/42528

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