Spectral properties of intermediate to high refractive index nanocubes
Spectral properties of intermediate to high refractive index nanocubes
Plasmonic resonances in sub-wavelength cavities, created by metallic nanocubes separated from a metallic surface by a dielectric gap, lead to strong light confinement and strong Purcell effect, with many applications in spectroscopy, enhanced light emission and optomechanics. However, the limited choice of metals, and the constraints on the sizes of the nanocubes, restrict the optical wavelength range of applications. We show that dielectric nanocubes made of intermediate to high refractive index materials exhibit similar but significantly blue shifted and enriched optical responses due to the interaction between gap plasmonic modes and internal modes. This result is explained, and the efficiency of dielectric nanocubes for light absorption and spontaneous emission is quantified by comparing the optical response and induced fluorescence enhancement of nanocubes made of barium titanate, tungsten trioxide, gallium phosphide, silicon, silver and rhodium.
plasmonic nanoantennas, dielectric nanostructures, OPTICS, Purcell effect
11395-11407
Madeleine, Tristan
7a9d1327-0a94-4e8c-9003-d80f1778db54
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
27 March 2023
Madeleine, Tristan
7a9d1327-0a94-4e8c-9003-d80f1778db54
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Madeleine, Tristan, D'Alessandro, Giampaolo and Kaczmarek, Malgosia
(2023)
Spectral properties of intermediate to high refractive index nanocubes.
Optics Express, 31 (7), .
(doi:10.1364/oe.485872).
Abstract
Plasmonic resonances in sub-wavelength cavities, created by metallic nanocubes separated from a metallic surface by a dielectric gap, lead to strong light confinement and strong Purcell effect, with many applications in spectroscopy, enhanced light emission and optomechanics. However, the limited choice of metals, and the constraints on the sizes of the nanocubes, restrict the optical wavelength range of applications. We show that dielectric nanocubes made of intermediate to high refractive index materials exhibit similar but significantly blue shifted and enriched optical responses due to the interaction between gap plasmonic modes and internal modes. This result is explained, and the efficiency of dielectric nanocubes for light absorption and spontaneous emission is quantified by comparing the optical response and induced fluorescence enhancement of nanocubes made of barium titanate, tungsten trioxide, gallium phosphide, silicon, silver and rhodium.
Text
oe-31-7-11395
- Version of Record
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Accepted/In Press date: 26 February 2023
e-pub ahead of print date: 20 March 2023
Published date: 27 March 2023
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© 2023 OSA - The Optical Society. All rights reserved.
Keywords:
plasmonic nanoantennas, dielectric nanostructures, OPTICS, Purcell effect
Identifiers
Local EPrints ID: 476735
URI: http://eprints.soton.ac.uk/id/eprint/476735
ISSN: 1094-4087
PURE UUID: 7f232a0a-f77a-4e58-b852-cce49eeb1d38
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Date deposited: 12 May 2023 16:55
Last modified: 18 Jun 2024 01:57
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