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We form sub-micrometer-sized vapor bubbles around a single laser heating goldnanoparticle in a liquid and monitor them through optical scattering of a probelaser. The fast, inertia-governed expansion is followed by a slower contractionand disappearance after some tens of nanoseconds. In a narrow range ofillumination powers, bubble time traces show a clear echo signature. Weattribute it to sound waves released upon the initial explosion and reflectedby flat interfaces, hundreds of microns away from the particle. Echoes cantrigger new explosions. A steady state of nanobubble with a vapor shellsurrounding the heated nanoparticle can be reached by a proper time profile ofthe heating intensity. Stable nanobubbles could have original applications forlight modulation and for enhanced optical-acoustic coupling in photoacousticmicroscopy.

Explosive Formation and Dynamics of Vapor Nanobubbles around a Continuously Heated Gold Nanosphere