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Optical nonlocality in polar dielectrics

Optical nonlocality in polar dielectrics
Optical nonlocality in polar dielectrics
Phonon polaritons localised in polar nanoresonators and superlattices are being actively investigated as promising platforms for mid-infrared nanophotonics. Here we show that the nonlocal nature of the phonon response can strongly modify their nanoscale physics. Using a nonlocal dielectric approach we study dielectric nanospheres and thin dielectric films taking into account optical phonons dispersion. We discover a rich nonlocal phenomenology, qualitatively different from the one of plasmonic systems. Our theory allows us to explain the recently reported discrepancy between theory and experiments in atomic-scale superlattices, and it provides a practical tool for the design of phonon-polariton nanodevices.
2160-3308
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Gubbin, Christopher
09b75073-7a9a-4443-9a84-1458ec2535e9
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Gubbin, Christopher
09b75073-7a9a-4443-9a84-1458ec2535e9

De Liberato, Simone and Gubbin, Christopher (2020) Optical nonlocality in polar dielectrics. Physical Review X. (In Press)

Record type: Article

Abstract

Phonon polaritons localised in polar nanoresonators and superlattices are being actively investigated as promising platforms for mid-infrared nanophotonics. Here we show that the nonlocal nature of the phonon response can strongly modify their nanoscale physics. Using a nonlocal dielectric approach we study dielectric nanospheres and thin dielectric films taking into account optical phonons dispersion. We discover a rich nonlocal phenomenology, qualitatively different from the one of plasmonic systems. Our theory allows us to explain the recently reported discrepancy between theory and experiments in atomic-scale superlattices, and it provides a practical tool for the design of phonon-polariton nanodevices.

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Accepted/In Press date: 26 March 2020

Identifiers

Local EPrints ID: 439707
URI: http://eprints.soton.ac.uk/id/eprint/439707
ISSN: 2160-3308
PURE UUID: d25f8450-8728-4578-b984-a06773f6be38
ORCID for Simone De Liberato: ORCID iD orcid.org/0000-0002-4851-2633
ORCID for Christopher Gubbin: ORCID iD orcid.org/0000-0003-3988-028X

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Date deposited: 30 Apr 2020 16:30
Last modified: 07 Oct 2020 02:09

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