Measuring bulk and surface acoustic modes in diamond by angle-resolved Brillouin spectroscopy

TL;DR

This study uses angle-resolved Brillouin spectroscopy to measure bulk and surface acoustic modes in diamond, revealing high-velocity waves and their relation to optical properties, aiding future diamond acoustic research and device development.

Contribution

First to identify high-velocity surface skimming bulk waves in diamond using angle-resolved Brillouin spectroscopy and analyze their relation to optical parameters.

Findings

Identified two high-velocity surface skimming bulk waves in diamond.

Established the relationship among refractive index, incident angle, and wave velocities.

Provided data useful for diamond-based acoustic device engineering.

Abstract

The acoustic modes of diamond not only are of profound significance for studying its thermal conductivity, mechanical properties and optical properties, but also play a determined role in the performance of high-frequency and high-power acoustic wave devices. Here we report the bulk acoustic waves (BAWs) and surface acoustic waves (SAWs) of single crystal diamond by using the angle-resolved Brillouin light scattering (BLS) spectroscopy. We identify two high-velocity surface skimming bulk waves, with sound velocities of 1.277x10^6 and 1.727x10^6 cm/s, respectively. Furthermore, we conduct the relationship among the refractive index, incident angle and the velocities of BAWs propagating along an arbitrary direction. Our results may provide a valuable reference for fundamental researches and devices engineering in the community of diamond-based acoustic study.