title: Strong and Coherent Coupling between Localized and Propagating Phonon Polaritons.
abstract: Following the recent observation of localized phonon polaritons in user-defined silicon carbide nanoresonators, here we demonstrate strong and coherent coupling between those localized modes and propagating phonon polaritons bound to the surface of the nanoresonator's substrate. In order to obtain phase matching, the nanoresonators have been fabricated to serve the double function of hosting the localized modes, while also acting as a grating for the propagating ones. The coherent coupling between long lived, optically accessible localized modes, and low-loss propagative ones, opens the way to the design and realization of phonon-polariton based coherent circuits.
authors.affiliation: Department of Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.|School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Gubbin
authors.affiliation: School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
authors.forename: Francesco
authors.initials: F
authors.lastname: Martini
authors.affiliation: School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
authors.forename: Alberto
authors.initials: A
authors.lastname: Politi
authors.affiliation: Department of Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Maier
authors.affiliation: School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom.
authors.forename: Simone
authors.initials: S
authors.lastname: De Liberato