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Engineering the spectral and spatial dispersion of thermal emission via polariton-phonon strong coupling

Engineering the spectral and spatial dispersion of thermal emission via polariton-phonon strong coupling
Engineering the spectral and spatial dispersion of thermal emission via polariton-phonon strong coupling
Strong coupling between optical modes can be implemented into nanophotonic design to modify the energy–momentum dispersion relation. This approach offers potential avenues for tuning the thermal emission frequency, line width, polarization, and spatial coherence. Here, we employ three-mode strong coupling between propagating and localized surface phonon polaritons, with zone-folded longitudinal optic phonons within periodic arrays of 4H-SiC nanopillars. Energy exchange, mode evolution, and coupling strength between the three polariton branches are explored experimentally and theoretically. The influence of strong coupling upon the angle-dependent thermal emission was directly measured, providing excellent agreement with theory. We demonstrate a 5-fold improvement in the spatial coherence and 3-fold enhancement of the quality factor of the polaritonic modes, with these hybrid modes also exhibiting a mixed character that could enable opportunities to realize electrically driven emission. Our results show that polariton–phonon strong coupling enables thermal emitters, which meet the requirements for a host of IR applications in a simple, lightweight, narrow-band, and yet bright emitter.
Long-wave infrared, Strong coupling, Surface phonon polaritons, Thermal emitters, Zone-folded longitudinal optic phonons
1530-6984
1831-1838
Lu, Guanyu
c14b34b7-7e94-4a2d-903a-25112b2007f8
Gubbin, Christopher
09b75073-7a9a-4443-9a84-1458ec2535e9
Nolen, J. Ryan
be8809ea-4046-4523-8099-be2083f87ad1
Folland, Thomas Graeme
c76f06dc-e9c4-4fb0-9344-ec54e320b7b1
Tadjer, Marko J.
1d88a27e-1e42-4276-b6c3-cbfb95b06439
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Caldwell, Joshua D.
a1eb4205-8a65-48cb-9e7b-4213d744970e
Lu, Guanyu
c14b34b7-7e94-4a2d-903a-25112b2007f8
Gubbin, Christopher
09b75073-7a9a-4443-9a84-1458ec2535e9
Nolen, J. Ryan
be8809ea-4046-4523-8099-be2083f87ad1
Folland, Thomas Graeme
c76f06dc-e9c4-4fb0-9344-ec54e320b7b1
Tadjer, Marko J.
1d88a27e-1e42-4276-b6c3-cbfb95b06439
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Caldwell, Joshua D.
a1eb4205-8a65-48cb-9e7b-4213d744970e

Lu, Guanyu, Gubbin, Christopher, Nolen, J. Ryan, Folland, Thomas Graeme, Tadjer, Marko J., De Liberato, Simone and Caldwell, Joshua D. (2021) Engineering the spectral and spatial dispersion of thermal emission via polariton-phonon strong coupling. Nano Letters, 21 (4), 1831-1838. (doi:10.1021/acs.nanolett.0c04767).

Record type: Article

Abstract

Strong coupling between optical modes can be implemented into nanophotonic design to modify the energy–momentum dispersion relation. This approach offers potential avenues for tuning the thermal emission frequency, line width, polarization, and spatial coherence. Here, we employ three-mode strong coupling between propagating and localized surface phonon polaritons, with zone-folded longitudinal optic phonons within periodic arrays of 4H-SiC nanopillars. Energy exchange, mode evolution, and coupling strength between the three polariton branches are explored experimentally and theoretically. The influence of strong coupling upon the angle-dependent thermal emission was directly measured, providing excellent agreement with theory. We demonstrate a 5-fold improvement in the spatial coherence and 3-fold enhancement of the quality factor of the polaritonic modes, with these hybrid modes also exhibiting a mixed character that could enable opportunities to realize electrically driven emission. Our results show that polariton–phonon strong coupling enables thermal emitters, which meet the requirements for a host of IR applications in a simple, lightweight, narrow-band, and yet bright emitter.

Text
Engineering the Spectral and Spatial Dispersion of Thermal Emission via Polariton-Phonon Strong Coupling - Accepted Manuscript
Restricted to Repository staff only until 15 March 2022.
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More information

Accepted/In Press date: 15 February 2021
e-pub ahead of print date: 15 February 2021
Published date: 24 February 2021
Keywords: Long-wave infrared, Strong coupling, Surface phonon polaritons, Thermal emitters, Zone-folded longitudinal optic phonons

Identifiers

Local EPrints ID: 448398
URI: http://eprints.soton.ac.uk/id/eprint/448398
ISSN: 1530-6984
PURE UUID: b40ef195-407c-44b2-8aec-36fc3bd4b18a
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: 21 Apr 2021 16:33
Last modified: 27 Apr 2021 01:48

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Contributors

Author: Guanyu Lu
Author: Christopher Gubbin ORCID iD
Author: J. Ryan Nolen
Author: Thomas Graeme Folland
Author: Marko J. Tadjer
Author: Joshua D. Caldwell

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