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Nonlocal scattering matrix description of anisotropic polar heterostructures

Nonlocal scattering matrix description of anisotropic polar heterostructures
Nonlocal scattering matrix description of anisotropic polar heterostructures
Polar dielectrics are a promising platform for mid-infrared nanophotonics, allowing for nanoscale electromagnetic energy confinement in oscillations of the crystal lattice. We recently demonstrated that in nanoscopic polar systems a local description of the optical response fails, leading to erroneous predictions of modal frequencies and electromagnetic field enhancements. In this Paper we extend our previous work providing a scattering matrix theory of the nonlocal optical response of planar, anisotropic, layered polar dielectric heterostructures. The formalism we employ allows for the calculation of both reflection and transmission coefficients, and of the guided mode spectrum. We apply our theory to complex AlN/GaN superlattices, demonstrating the strong nonlocal tuneability of the optical response arising from hybridisation between photon and phonon modes. The numerical code underlying these calculations is provided in an online repository to serve as a tool for the design of phonon-based mid-infrared optoelectronic devices.
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) Nonlocal scattering matrix description of anisotropic polar heterostructures. Physical Review B. (Submitted)

Record type: Article

Abstract

Polar dielectrics are a promising platform for mid-infrared nanophotonics, allowing for nanoscale electromagnetic energy confinement in oscillations of the crystal lattice. We recently demonstrated that in nanoscopic polar systems a local description of the optical response fails, leading to erroneous predictions of modal frequencies and electromagnetic field enhancements. In this Paper we extend our previous work providing a scattering matrix theory of the nonlocal optical response of planar, anisotropic, layered polar dielectric heterostructures. The formalism we employ allows for the calculation of both reflection and transmission coefficients, and of the guided mode spectrum. We apply our theory to complex AlN/GaN superlattices, demonstrating the strong nonlocal tuneability of the optical response arising from hybridisation between photon and phonon modes. The numerical code underlying these calculations is provided in an online repository to serve as a tool for the design of phonon-based mid-infrared optoelectronic devices.

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Nonlocal Scattering Matrix Description of Anisotropic Polar Heterostructures
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Submitted date: 1 October 2020
Keywords: Phonon Polariton, Optical Nonlocality, Mid-infrared

Identifiers

Local EPrints ID: 445051
URI: http://eprints.soton.ac.uk/id/eprint/445051
ISSN: 1550-235X
PURE UUID: 4cd43c7d-0ccb-4c49-9d30-3406ac40f81d
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

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

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