A new nanoparticle source has been developed that uses light to generate high frequency sound waves. This new source could be used for a variety of applications, such as medical imaging, sonar and acoustic communication. The new source is based on a technology called photothermal conversion, which uses light and heat to create sound. The nanoparticle source is composed of a layer of nanoparticles, which absorb incoming light and convert the energy into heat. The heat then causes the nanoparticles to vibrate and generate sound waves. This new source is a promising development that could revolutionize the fields of medical imaging, sonar, and acoustic communication.

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source: Phys.org