Quantum theory of longitudinal-transverse polaritons in nonlocal thin films
Quantum theory of longitudinal-transverse polaritons in nonlocal thin films
When midinfrared light interacts with nanoscale polar dielectric structures, optical phonon propagation cannot be ignored, leading to a rich nonlocal phenomenology that we have only recently started to uncover. In properly crafted nanodevices this includes the creation of polaritonic excitations with hybrid longitudinal-transverse nature, which are predicted to allow energy funneling from longitudinal electrical currents to far-field transverse radiation. In this work we study the physics of these longitudinal-transverse polaritons in a dielectric nanolayer in which the nonlocality strongly couples epsilon-near-zero modes to longitudinal phonons. After having calculated the system’s spectrum solving Maxwell’s equations, we develop an analytical polaritonic theory able to transparently quantify the nonlocality-mediated coupling as a function of the system parameters. Such a theory provides a powerful tool for the study of longitudinal-transverse polariton interactions and we use it to determine the conditions required for the hybrid modes to appear.
Gubbin, Christopher R.
09b75073-7a9a-4443-9a84-1458ec2535e9
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
27 January 2022
Gubbin, Christopher R.
09b75073-7a9a-4443-9a84-1458ec2535e9
De Liberato, Simone
5942e45f-3115-4027-8653-a82667ed8473
Gubbin, Christopher R. and De Liberato, Simone
(2022)
Quantum theory of longitudinal-transverse polaritons in nonlocal thin films.
Physical Review Applied, 17 (1), [014037].
(doi:10.1103/PhysRevApplied.17.014037).
Abstract
When midinfrared light interacts with nanoscale polar dielectric structures, optical phonon propagation cannot be ignored, leading to a rich nonlocal phenomenology that we have only recently started to uncover. In properly crafted nanodevices this includes the creation of polaritonic excitations with hybrid longitudinal-transverse nature, which are predicted to allow energy funneling from longitudinal electrical currents to far-field transverse radiation. In this work we study the physics of these longitudinal-transverse polaritons in a dielectric nanolayer in which the nonlocality strongly couples epsilon-near-zero modes to longitudinal phonons. After having calculated the system’s spectrum solving Maxwell’s equations, we develop an analytical polaritonic theory able to transparently quantify the nonlocality-mediated coupling as a function of the system parameters. Such a theory provides a powerful tool for the study of longitudinal-transverse polariton interactions and we use it to determine the conditions required for the hybrid modes to appear.
Text
2105.13219
- Accepted Manuscript
More information
Accepted/In Press date: 24 December 2021
Published date: 27 January 2022
Additional Information:
Funding Information:
The authors would like to thank Thomas G. Folland for fruitful discussions. S.D.L. is supported by a Royal Society Research fellowship and the Philip Leverhulme prize. The authors acknowledge support from the Royal Society Grant No. RGF\EA\181001 and the Leverhumlme Grant No. RPG-2019-174.
Publisher Copyright:
© 2022 American Physical Society.
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Local EPrints ID: 455148
URI: http://eprints.soton.ac.uk/id/eprint/455148
ISSN: 2331-7019
PURE UUID: 94db7f82-619b-438d-a018-2cd9c10548bc
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Date deposited: 10 Mar 2022 19:19
Last modified: 06 Jun 2024 01:51
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Author:
Christopher R. Gubbin
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