Thermal radiation forces on planar structures with asymmetric optical response
arxiv(2024)
摘要
Light carries momentum and, upon interaction with material structures, can
exert forces on them. Here, we show that a planar structure with asymmetric
optical response is spontaneously accelerated when placed in an environment at
a different temperature. This phenomenon originates from the imbalance in the
exchange rates of photons between both sides of the structure and the
environment. Using a simple theoretical model, we calculate the force acting on
the planar structure and its terminal velocity in vacuum, and analyze their
dependence on the initial temperature and the geometrical properties of the
system for different realistic materials. Our results unravel an alternative
approach to manipulating objects in the nano and microscale that does not
require an external source of radiation.
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