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Impact of phonon nonlocality on nanogap and nanolayer polar resonators

Impact of phonon nonlocality on nanogap and nanolayer polar resonators
Impact of phonon nonlocality on nanogap and nanolayer polar resonators
Polar dielectric nanoresonators can support hybrid photon-phonon modes termed surface phonon polaritons with length scales below the diffraction limit. In the deep subwavelength regime the optical response of these systems was shown to diverge from that predicted through a standard dielectric description. Recently, we developed an analytical, dielectric approach and applied it to spheres and planar heterostructures, reproducing anomalous features observed in experiment and microscopic calculations. In this Rapid Communication we develop tools to describe the nonlocal response of polar nanoresonators of arbitrary symmetry, and use them to investigate systems with nanogaps and nanolayers of practical technological relevance. We demonstrate that the available field enhancement is strongly reduced, as the electromagnetic energy leaks away from the hot spots, while phononic resonances are shifted by resonator effects.
Phonon Polariton, Optical Nonlocality, Mid-infrared
1550-235X
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
5942e45f-3115-4027-8653-a82667ed8473

Gubbin, Christopher and De Liberato, Simone (2020) Impact of phonon nonlocality on nanogap and nanolayer polar resonators. Physical Review B. (In Press)

Record type: Letter

Abstract

Polar dielectric nanoresonators can support hybrid photon-phonon modes termed surface phonon polaritons with length scales below the diffraction limit. In the deep subwavelength regime the optical response of these systems was shown to diverge from that predicted through a standard dielectric description. Recently, we developed an analytical, dielectric approach and applied it to spheres and planar heterostructures, reproducing anomalous features observed in experiment and microscopic calculations. In this Rapid Communication we develop tools to describe the nonlocal response of polar nanoresonators of arbitrary symmetry, and use them to investigate systems with nanogaps and nanolayers of practical technological relevance. We demonstrate that the available field enhancement is strongly reduced, as the electromagnetic energy leaks away from the hot spots, while phononic resonances are shifted by resonator effects.

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Impact of phonon nonlocality on nanogap and nanolayer polar resonators
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More information

Accepted/In Press date: 26 October 2020
Keywords: Phonon Polariton, Optical Nonlocality, Mid-infrared

Identifiers

Local EPrints ID: 445046
URI: http://eprints.soton.ac.uk/id/eprint/445046
ISSN: 1550-235X
PURE UUID: 4454aec5-88d0-4bfa-b420-168067fad7fd
ORCID for Christopher Gubbin: ORCID iD orcid.org/0000-0003-3988-028X
ORCID for Simone De Liberato: ORCID iD orcid.org/0000-0002-4851-2633

Catalogue record

Date deposited: 18 Nov 2020 17:31
Last modified: 18 Nov 2020 17:31

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Contributors

Author: Christopher Gubbin ORCID iD

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