Engineering nanoscale hypersonic phonon transport

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 t...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2022-02
Main Authors: Florez, O, Arregui, G, Albrechtsen, M, Ng, R C, Gomis-Bresco, J, Stobbe, S, Sotomayor-Torres, C M, García, P D
Format: Article
Language:English
Subjects:
Frequency ranges
Mechanical properties
Opto-mechanics
Phonons
Room temperature
Signal processing
Waveguides
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2202.02166