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Irradiation with UV-C band ultraviolet light is one of the most commonly usedways of disinfecting water contaminated by pathogens such as bacteria andviruses. Sonoluminescence, the emission of light from acoustically-inducedcollapse of air bubbles in water, is an efficient means of generating UV-Clight. However, because a spherical bubble collapsing in the bulk of watercreates isotropic radiation, the generated UV-C light fluence is insufficientfor disinfection. Here, we show that we can create a UV light beam fromaspherical air bubble collapse near a gallium-based liquid-metal microparticle.The beam is perpendicular to the metal surface and is caused by the interactionof sonoluminescence light with UV plasmon modes of the metal. We calculate thatsuch beams can generate fluences exceeding $10$ mJ/cm$^2$, which is sufficientto irreversibly inactivate most common pathogens in water with the turbidity ofmore than $5$ Nephelometric Turbidity Units.

Beamed UV sonoluminescence by aspherical air bubble collapse near liquid-metal microparticles