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We introduce a pump-probe laser setup to explore the interaction of light momentum and fluid mechanics in a two-layer liquid system. Creating a nanometric bulge in the upper layer reveals a transient bulge on the liquid-liquid interface propelled by viscous stress towards the higher refractive index liquid. Noninvasive measurements and numerical simulations validate our findings, unraveling the intricate interplay between light momentum theories (Minkowski and Abraham) and fluid mechanics. The transient deformation height serves as a precise indicator of surface tension and viscosity, enabling nanoscale manipulation with potential applications in sensors, actuators, and optical devices.
Verma et al. (Fri,) studied this question.
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