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Hybrid longitudinal-transverse phonon polaritons

Hybrid longitudinal-transverse phonon polaritons
Hybrid longitudinal-transverse phonon polaritons
Phonon polaritons, hybrid light-matter quasiparticles resulting from strong coupling of the electromagnetic field with the lattice vibrations of polar crystals are a promising platform for mid-infrared photonics but for the moment there has been no proposal allowing for their electrical pumping. Electrical currents in fact mainly generate longitudinal optical phonons, while only transverse ones participate in the creation of phonon polaritons. We demonstrate how to exploit long-cell polytypes of silicon carbide to achieve strong coupling between transverse phonon polaritons and zone-folded longitudinal optical phonons. We develop a microscopic theory predicting the existence of the resulting hybrid longitudinal-transverse excitations. We then provide an experimental observation by tuning the resonance of a nanopillar array through the folded longitudinal optical mode, obtaining a clear spectral anti-crossing. The hybridisation of phonon polaritons with longitudinal phonons could represent an important step toward the development of phonon polariton-based electrically pumped mid-infrared emitters.
Polariton, Surface Phonon Polariton, Mid-IR
1-6
Gubbin, Christopher
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Berte, Rodrigo
6110e8e5-7ad2-4efc-b333-fca479db8460
Meeker, Michael
47f3ceb2-da6d-464b-9f60-770ee6818039
Giles, Alexander
eb29e210-a78d-417c-8a7a-0998d7680d8e
Ellis, Chase
9f883536-c49e-4ea0-8cea-9113b78fc5ec
Tischler, Joseph
2ca9a370-ccab-47fd-b813-021bb37b48f8
Wheeler, Virginia
0d26c386-2293-4f95-a658-ddd1e0046b81
Maier, Stefan
950db919-e145-48b5-bd73-196de02e46fe
Caldwell, Joshua D.
a1eb4205-8a65-48cb-9e7b-4213d744970e
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Gubbin, Christopher
09b75073-7a9a-4443-9a84-1458ec2535e9
Berte, Rodrigo
6110e8e5-7ad2-4efc-b333-fca479db8460
Meeker, Michael
47f3ceb2-da6d-464b-9f60-770ee6818039
Giles, Alexander
eb29e210-a78d-417c-8a7a-0998d7680d8e
Ellis, Chase
9f883536-c49e-4ea0-8cea-9113b78fc5ec
Tischler, Joseph
2ca9a370-ccab-47fd-b813-021bb37b48f8
Wheeler, Virginia
0d26c386-2293-4f95-a658-ddd1e0046b81
Maier, Stefan
950db919-e145-48b5-bd73-196de02e46fe
Caldwell, Joshua D.
a1eb4205-8a65-48cb-9e7b-4213d744970e
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473

Gubbin, Christopher, Berte, Rodrigo, Meeker, Michael, Giles, Alexander, Ellis, Chase, Tischler, Joseph, Wheeler, Virginia, Maier, Stefan, Caldwell, Joshua D. and De Liberato, Simone (2019) Hybrid longitudinal-transverse phonon polaritons. Nature Communications, 10 (1), 1-6, [1682]. (doi:10.1038/s41467-019-09414-4).

Record type: Letter

Abstract

Phonon polaritons, hybrid light-matter quasiparticles resulting from strong coupling of the electromagnetic field with the lattice vibrations of polar crystals are a promising platform for mid-infrared photonics but for the moment there has been no proposal allowing for their electrical pumping. Electrical currents in fact mainly generate longitudinal optical phonons, while only transverse ones participate in the creation of phonon polaritons. We demonstrate how to exploit long-cell polytypes of silicon carbide to achieve strong coupling between transverse phonon polaritons and zone-folded longitudinal optical phonons. We develop a microscopic theory predicting the existence of the resulting hybrid longitudinal-transverse excitations. We then provide an experimental observation by tuning the resonance of a nanopillar array through the folded longitudinal optical mode, obtaining a clear spectral anti-crossing. The hybridisation of phonon polaritons with longitudinal phonons could represent an important step toward the development of phonon polariton-based electrically pumped mid-infrared emitters.

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More information

Accepted/In Press date: 24 February 2019
Published date: 11 April 2019
Keywords: Polariton, Surface Phonon Polariton, Mid-IR

Identifiers

Local EPrints ID: 430388
URI: http://eprints.soton.ac.uk/id/eprint/430388
PURE UUID: 3b3ea3f4-3632-4ec4-9d31-f2de33b70b07
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: 26 Apr 2019 16:30
Last modified: 07 Oct 2020 02:09

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Contributors

Author: Christopher Gubbin ORCID iD
Author: Rodrigo Berte
Author: Michael Meeker
Author: Alexander Giles
Author: Chase Ellis
Author: Joseph Tischler
Author: Virginia Wheeler
Author: Stefan Maier
Author: Joshua D. Caldwell

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