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Near-field spectroscopy of cylindrical phonon-polariton antennas

Near-field spectroscopy of cylindrical phonon-polariton antennas
Near-field spectroscopy of cylindrical phonon-polariton antennas
Surface phonon polaritons (SPhPs) are hybrid light–matter states in which light strongly couples to lattice vibrations inside the Reststrahlen band of polar dielectrics at mid-infrared frequencies. Antennas supporting localized surface phonon polaritons (LSPhPs) easily outperform their plasmonic counterparts operating in the visible or near-infrared in terms of field enhancement and confinement thanks to the inherently slower phonon–phonon scattering processes governing SPhP decay. In particular, LSPhP antennas have attracted considerable interest for thermal management at the nanoscale, where the emission strongly diverts from the usual far-field blackbody radiation due to the presence of evanescent waves at the surface. However, far-field measurements cannot shed light on the behavior of antennas in the near-field region. To overcome this limitation, we employ scattering-scanning near-field optical microscopy (sSNOM) to unveil the spectral near-field response of 3C-SiC antenna arrays. We present a detailed description of the behavior of the antenna resonances by comparing far-field and near-field spectra and demonstrate the existence of a mode with no net dipole moment, absent in the far-field spectra, but of importance for applications that exploit the heightened electromagnetic near fields. Furthermore, we investigate the perturbation in the antenna response induced by the presence of the AFM tip, which can be further extended toward situations where for example strong IR emitters couple to LSPhP modes.
1936-0851
Mancini, Andrea
17b367f1-e0e8-49f1-9298-9540725e182f
Gubbin, Christopher
09b75073-7a9a-4443-9a84-1458ec2535e9
Berté, Rodrigo
6110e8e5-7ad2-4efc-b333-fca479db8460
Martini, Francesco
394af6a7-dbcf-4d7b-9add-f7ed80bfe020
Politi, Alberto
cf75c0a8-d34d-4cbe-b9d5-e408c0edeeec
Cortés, Emiliano
403fa2c4-dd8e-44a3-bc87-6330f9895921
Li, Yi
76dfac3c-5e81-4b4e-8887-98e9d91dd119
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Maier, Stefan A.
950db919-e145-48b5-bd73-196de02e46fe
Mancini, Andrea
17b367f1-e0e8-49f1-9298-9540725e182f
Gubbin, Christopher
09b75073-7a9a-4443-9a84-1458ec2535e9
Berté, Rodrigo
6110e8e5-7ad2-4efc-b333-fca479db8460
Martini, Francesco
394af6a7-dbcf-4d7b-9add-f7ed80bfe020
Politi, Alberto
cf75c0a8-d34d-4cbe-b9d5-e408c0edeeec
Cortés, Emiliano
403fa2c4-dd8e-44a3-bc87-6330f9895921
Li, Yi
76dfac3c-5e81-4b4e-8887-98e9d91dd119
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Maier, Stefan A.
950db919-e145-48b5-bd73-196de02e46fe

Mancini, Andrea, Gubbin, Christopher, Berté, Rodrigo, Martini, Francesco, Politi, Alberto, Cortés, Emiliano, Li, Yi, De Liberato, Simone and Maier, Stefan A. (2020) Near-field spectroscopy of cylindrical phonon-polariton antennas. ACS Nano. (doi:10.1021/acsnano.0c02784).

Record type: Article

Abstract

Surface phonon polaritons (SPhPs) are hybrid light–matter states in which light strongly couples to lattice vibrations inside the Reststrahlen band of polar dielectrics at mid-infrared frequencies. Antennas supporting localized surface phonon polaritons (LSPhPs) easily outperform their plasmonic counterparts operating in the visible or near-infrared in terms of field enhancement and confinement thanks to the inherently slower phonon–phonon scattering processes governing SPhP decay. In particular, LSPhP antennas have attracted considerable interest for thermal management at the nanoscale, where the emission strongly diverts from the usual far-field blackbody radiation due to the presence of evanescent waves at the surface. However, far-field measurements cannot shed light on the behavior of antennas in the near-field region. To overcome this limitation, we employ scattering-scanning near-field optical microscopy (sSNOM) to unveil the spectral near-field response of 3C-SiC antenna arrays. We present a detailed description of the behavior of the antenna resonances by comparing far-field and near-field spectra and demonstrate the existence of a mode with no net dipole moment, absent in the far-field spectra, but of importance for applications that exploit the heightened electromagnetic near fields. Furthermore, we investigate the perturbation in the antenna response induced by the presence of the AFM tip, which can be further extended toward situations where for example strong IR emitters couple to LSPhP modes.

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SiC_Pillars_near_field_draft - Accepted Manuscript
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Accepted/In Press date: 12 June 2020
e-pub ahead of print date: 17 June 2020

Identifiers

Local EPrints ID: 441778
URI: http://eprints.soton.ac.uk/id/eprint/441778
ISSN: 1936-0851
PURE UUID: 1cd317dd-e45d-4212-9095-bcf7bf602e9c
ORCID for Christopher Gubbin: ORCID iD orcid.org/0000-0003-3988-028X
ORCID for Alberto Politi: ORCID iD orcid.org/0000-0002-3668-9474
ORCID for Simone De Liberato: ORCID iD orcid.org/0000-0002-4851-2633

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Date deposited: 26 Jun 2020 16:45
Last modified: 27 Jun 2020 00:35

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Contributors

Author: Andrea Mancini
Author: Christopher Gubbin ORCID iD
Author: Rodrigo Berté
Author: Francesco Martini
Author: Alberto Politi ORCID iD
Author: Emiliano Cortés
Author: Yi Li
Author: Stefan A. Maier

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