Hybrid longitudinal-transverse phonon polaritons

Christopher R. Gubbin, Rodrigo Berte, Michael A. Meeker, Alexander J. Giles, Chase T. Ellis, Joseph G. Tischler, Virginia D. Wheeler, Stefan A. Maier, Joshua D. Caldwell and Simone De Liberato ()
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Christopher R. Gubbin: University of Southampton
Rodrigo Berte: Ministry of Education of Brazil
Michael A. Meeker: U.S. Naval Research Laboratory
Alexander J. Giles: U.S. Naval Research Laboratory
Chase T. Ellis: U.S. Naval Research Laboratory
Joseph G. Tischler: U.S. Naval Research Laboratory
Virginia D. Wheeler: U.S. Naval Research Laboratory
Stefan A. Maier: Ludwig-Maximilians-Universität München
Joshua D. Caldwell: Vanderbilt University
Simone De Liberato: University of Southampton

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-09414-4

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