Engineering nanoscale hypersonic phonon transport

Abstract

Controlling the vibrations in solids is crucial to tailor their mechanical properties and their interaction with light. Thermal vibrations represent a source of noise and dephasing for many physical processes at the quantum level. One strategy to avoid these vibrations is to structure a solid such that it possesses a phononic stop band, i.e., a frequency range over which there are no available mechanical modes. Here, we demonstrate the complete absence of mechanical vibrations at room temperature over a broad spectral window, with a 5.3 GHz wide band gap centered at 8.4 GHz in a patterned silicon nanostructure membrane measured using Brillouin light scattering spectroscopy. By constructing a line-defect waveguide, we directly measure GHz localized modes at room temperature. Our experimental results of thermally excited guided mechanical modes at GHz frequencies provides an eficient platform for photon-phonon integration with applications in optomechanics and signal processing transduction.

References in corpus (6)

• Sideband Cooling Micromechanical Motion to the Quantum Ground State
• A Mechanical Mass Sensor with Yoctogram Resolution
• Interaction between light and highly confined hypersound in a silicon photonic nanowire
• Design of Optomechanical Cavities and Waveguides on a Simultaneous Bandgap Phononic-Photonic Crystal Slab
• Control of coherent information via on chip photonic-phononic emitter-receivers
• Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes

Cited by in corpus (9)

• Observation of strong backscattering in valley-Hall photonic topological interface modes
• Perspectives on high-frequency nanomechanics, nanoacoustics, and nanophononics
• Engineering Phonon-Qubit Interactions using Phononic Crystals
• Optomechanical generation of coherent GHz vibrations in a phononic waveguide
• Multimode optomechanics with a two-dimensional optomechanical crystal
• High-resolution acoustic field mapping of GHz phononic crystals with atomic force microscopy
• Silicon anisotropy in a bi-dimensional optomechanical cavity
• Phonon dispersion of nanoscale honeycomb phononic crystal: gigahertz and terahertz spectroscopy comparison
• A perspective on inelastic light scattering spectroscopy for probing transport of collective acoustic excitations