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We study the reversible crossover between stable and bistable phases of anover-damped Brownian bead inside an optical piston. The interaction potentialsare solved developing a method based on Kramers' theory that exploits thestatistical properties of the stochastic motion of the bead. We evaluateprecisely the energy balance of the crossover. We show that the deformation ofthe optical potentials induced by the compression of the piston is related to aproduction of heat which measures the non-adiabatic character of the crossover.This reveals how specific thermodynamic processes can be designed andcontrolled with a high level of precision by tailoring the optical landscapesof the piston.

Reversible compression of an optical piston through Kramers dynamics