A one-dimensional optomechanical crystal with a complete phononic band gap

J. Gomis-Bresco (), D. Navarro-Urrios, M. Oudich, S. El-Jallal, A. Griol, D. Puerto, E. Chavez, Y. Pennec, B. Djafari-Rouhani, F. Alzina, A. Martínez and C.M. Sotomayor Torres
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J. Gomis-Bresco: ICN2—Institut Catala de Nanociencia i Nanotecnologia, Campus UAB
D. Navarro-Urrios: ICN2—Institut Catala de Nanociencia i Nanotecnologia, Campus UAB
M. Oudich: Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1
S. El-Jallal: Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1
A. Griol: Nanophotonics Technology Center, Universitat Politècnica de València
D. Puerto: Nanophotonics Technology Center, Universitat Politècnica de València
E. Chavez: ICN2—Institut Catala de Nanociencia i Nanotecnologia, Campus UAB
Y. Pennec: Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1
B. Djafari-Rouhani: Institut d'Electronique, de Microélectronique et de Nanotechnologie, UMR CNRS 8520, UFR de Physique, Université Lille1
F. Alzina: ICN2—Institut Catala de Nanociencia i Nanotecnologia, Campus UAB
A. Martínez: Nanophotonics Technology Center, Universitat Politècnica de València
C.M. Sotomayor Torres: ICN2—Institut Catala de Nanociencia i Nanotecnologia, Campus UAB

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5452

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