Inducing dynamical bistability by reversible compression of an optical piston

Area of Science:

• Statistical mechanics
• Thermodynamics
• Optical physics

Background:

• Brownian motion describes the random movement of particles suspended in a fluid.
• Optical tweezers use focused laser beams to trap and manipulate microscopic objects.
• Phase transitions involve changes in the physical state of a system.

Purpose of the Study:

• To investigate the reversible phase crossover between stable and bistable states of a Brownian bead in an optical piston.
• To precisely evaluate the energy balance during this crossover.
• To establish a connection between optical potential deformation and thermodynamic processes.

Main Methods:

• Utilizing Kramers's theory to solve interaction potentials.
• Analyzing the statistical properties of the Brownian bead's stochastic motion.
• Calculating the energy balance, including potential energy changes and work done by the piston.

Main Results:

• A method based on Kramers's theory was developed to precisely solve interaction potentials.
• The energy balance of the reversible crossover was accurately evaluated.
• Deformation of optical potentials was linked to heat production, balancing potential energy and work.

Conclusions:

• The study demonstrates a precise method for analyzing thermodynamic processes in optical systems.
• Tailoring optical landscapes allows for controlled design and manipulation of thermodynamic processes.
• Findings offer insights into controlling heat production and energy balance in Brownian systems.