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Fluctuating Forces Induced by Nonequilibrium and Coherent Light Flow
Ariane Soret1,2, Karyn Le Hur2, Eric Akkermans1
1Department of Physics, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
Abstract:
We show that mesoscopic coherent fluctuations of light propagating in random media induce fluctuating radiation forces. A hydrodynamic Langevin approach is used to describe the coherent light fluctuations, whose noise term accounts for mesoscopic coherent effects. This description-generalizable to other quantum or classical wave problems-allows us to understand coherent fluctuations as a nonequilibrium light flow, characterized by the diffusion coefficient D and the mobility σ, otherwise related by a Einstein relation. The strength of these fluctuating forces is determined by a single dimensionless and tunable parameter, the conductance g_{L}. Orders of magnitude of these fluctuation forces are offered that show experimental feasibility.
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