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A University of Nottingham research team has developed a phonon probe device that can simultaneously access 3D spatial information and mechanical properties from microscopic objects. The probe operates at the GHz range of the acoustic spectrum. At such frequencies, the wavelength of sound becomes comparable to ultraviolet optical wavelengths and therefore provides an opportunity for high-resolution imaging.
The phonon probe, which supports applications in biological metrology, health care, and precision manufacturing, uses time-resolved Brillouin scattering to pump GHz frequency ultrasound from the tip of a 125-μm-diameter optical fiber into a specimen. It uses a pulsed laser to detect a high-frequency ultrasound wave as the wave…READ MORE