Antenna resonances in low aspect ratio semiconductor nanowires
Antenna resonances in low aspect ratio semiconductor nanowires
We present numerical simulations of low aspect ratio gallium phosphide nanowires under plane wave illumination, which reveal the interplay between transverse and longitudinal antenna-like resonances. A comparison to the limiting case of the semiconducting sphere shows a gradual, continuous transition of resonant electric and magnetic spherical Mie modes into Fabry-Pérot cavity modes with mixed electric and magnetic characteristics. As the length of the nanowires further increases, these finite-wire modes converge towards the leaky-mode resonances of an infinite cylindrical wire. Furthermore, we report a large and selective enhancement or suppression of electric and magnetic field in structures comprising two semiconducting nanowires. For an interparticle separation of 20 nm, we observe up to 300-fold enhancement in the electric field intensity and an almost complete quenching of the magnetic field in specific mode configurations. Angle-dependent extinction spectra highlight the importance of symmetry and phase matching in the excitation of cavity modes and show the limited validity of the infinite wire approximation for describing the response of finite length nanowires toward glancing angles.
22771-22787
Traviss, Daniel J.
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Schmidt, Mikolaj K.
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Aizpurua, Javier
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Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
24 August 2015
Traviss, Daniel J.
eb9f6403-d646-42a6-8653-44f4147fd47b
Schmidt, Mikolaj K.
0bf400a3-59ee-419a-80dd-d63b8c0fdfe4
Aizpurua, Javier
17705349-38e3-4089-adba-547d02449095
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Traviss, Daniel J., Schmidt, Mikolaj K., Aizpurua, Javier and Muskens, Otto L.
(2015)
Antenna resonances in low aspect ratio semiconductor nanowires.
Optics Express, 23 (17), .
(doi:10.1364/OE.23.022771).
Abstract
We present numerical simulations of low aspect ratio gallium phosphide nanowires under plane wave illumination, which reveal the interplay between transverse and longitudinal antenna-like resonances. A comparison to the limiting case of the semiconducting sphere shows a gradual, continuous transition of resonant electric and magnetic spherical Mie modes into Fabry-Pérot cavity modes with mixed electric and magnetic characteristics. As the length of the nanowires further increases, these finite-wire modes converge towards the leaky-mode resonances of an infinite cylindrical wire. Furthermore, we report a large and selective enhancement or suppression of electric and magnetic field in structures comprising two semiconducting nanowires. For an interparticle separation of 20 nm, we observe up to 300-fold enhancement in the electric field intensity and an almost complete quenching of the magnetic field in specific mode configurations. Angle-dependent extinction spectra highlight the importance of symmetry and phase matching in the excitation of cavity modes and show the limited validity of the infinite wire approximation for describing the response of finite length nanowires toward glancing angles.
Text
TravissOptExpr150731.pdf
- Accepted Manuscript
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Accepted/In Press date: 13 August 2015
Published date: 24 August 2015
Organisations:
Quantum, Light & Matter Group
Identifiers
Local EPrints ID: 393295
URI: http://eprints.soton.ac.uk/id/eprint/393295
ISSN: 1094-4087
PURE UUID: 82b48842-f75f-456f-a66d-3de1db29855d
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Date deposited: 25 Apr 2016 11:37
Last modified: 15 Mar 2024 03:34
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Contributors
Author:
Daniel J. Traviss
Author:
Mikolaj K. Schmidt
Author:
Javier Aizpurua
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