title: A one-dimensional optomechanical crystal with a complete phononic band gap.
abstract: Recent years have witnessed the boom of cavity optomechanics, which exploits the confinement and coupling of optical and mechanical waves at the nanoscale. Among their physical implementations, optomechanical (OM) crystals built on semiconductor slabs enable the integration and manipulation of multiple OM elements in a single chip and provide gigahertz phonons suitable for coherent phonon manipulation. Different demonstrations of coupling of infrared photons and gigahertz phonons in cavities created by inserting defects on OM crystals have been performed. However, the considered structures do not show a complete phononic bandgap, which should enable longer lifetimes, as acoustic leakage is minimized. Here we demonstrate the excitation of acoustic modes in a one-dimensional OM crystal properly designed to display a full phononic bandgap for acoustic modes at 4 GHz. The modes inside the complete bandgap are designed to have high-mechanical Q-factors, limit clamping losses and be invariant to fabrication imperfections.
authors.affiliation: 1] ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, 08193 Barcelona, Spain [2].
authors.forename: J
authors.initials: J
authors.lastname: Gomis-Bresco
authors.affiliation: 1] ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, 08193 Barcelona, Spain [2] [3].
authors.forename: D
authors.initials: D
authors.lastname: Navarro-Urrios
authors.affiliation: 1] Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1, 59652 Villeneuve d'Ascq, France [2].
authors.forename: M
authors.initials: M
authors.lastname: Oudich
authors.affiliation: 1] Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1, 59652 Villeneuve d'Ascq, France [2] PRILM, Université Moulay Ismail, Faculté des sciences, B.P 11201 Zitoun Meknès, Maroc.
authors.forename: S
authors.initials: S
authors.lastname: El-Jallal
authors.affiliation: Nanophotonics Technology Center, Universitat Politècnica de València, Valencia 46022, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Griol
authors.affiliation: 1] Nanophotonics Technology Center, Universitat Politècnica de València, Valencia 46022, Spain [2].
authors.forename: D
authors.initials: D
authors.lastname: Puerto
authors.affiliation: 1] ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, 08193 Barcelona, Spain [2] Department of Physics, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Chavez
authors.affiliation: Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1, 59652 Villeneuve d'Ascq, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Pennec
authors.affiliation: Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1, 59652 Villeneuve d'Ascq, France.
authors.forename: B
authors.initials: B
authors.lastname: Djafari-Rouhani
authors.affiliation: ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, 08193 Barcelona, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Alzina
authors.affiliation: Nanophotonics Technology Center, Universitat Politècnica de València, Valencia 46022, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Martínez
authors.affiliation: 1] ICN2-Institut Catala de Nanociencia i Nanotecnologia, Campus UAB, 08193 Barcelona, Spain [2] ICREA-Institucio Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain.
authors.forename: C M Sotomayor
authors.initials: CM
authors.lastname: Torres