title: Defect-controlled hypersound propagation in hybrid superlattices.
abstract: We employ spontaneous Brillouin light scattering spectroscopy and detailed theoretical calculations to reveal and identify elastic excitations inside the band gap of hypersonic hybrid superlattices. Surface and cavity modes, their strength and anticrossing are unambiguously documented and fully controlled by layer thickness, elasticity, and sequence design. This new soft matter based superlattice platform allows facile engineering of the density of states and opens new pathways to tunable phoxonic crystals.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Schneider
authors.forename: Faroha
authors.initials: F
authors.lastname: Liaqat
authors.forename: El Houssaine
authors.initials: el H
authors.lastname: El Boudouti
authors.forename: Ossama
authors.initials: O
authors.lastname: El Abouti
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Tremel
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Butt
authors.forename: Bahram
authors.initials: B
authors.lastname: Djafari-Rouhani
authors.forename: George
authors.initials: G
authors.lastname: Fytas