Optomechanical deformation and strain in elastic dielectrics

Abstract

Light forces induced by scattering and absorption in elastic dielectrics lead to local density modulations and deformations. These perturbations in turn modify light propagation in the medium and generate an intricate nonlinear response. We generalise an analytic approach where light propagation in one-dimensional media of inhomogeneous density is modelled as a result of multiple scattering between polarizable slices. Using the Maxwell stress tensor formalism we compute the local optical forces and iteratively approach self-consistent density distributions where the elastic back-action balances gradient- and scattering forces. For an optically trapped dielectric we derive the nonlinear dependence of trap position, stiffness and total deformation on the object's size and field configuration. Generally trapping is enhanced by deformation, which exhibits a periodic change between stretching and compression. This strongly deviates from qualitative expectations based on the change of photon momentum of light crossing the surface of a dielectric. We conclude that optical forces have to be treated as volumetric forces and that a description using the change of photon momentum at the surface of a medium is inappropriate.

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Cited by in corpus (7)

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• Self-ordering and collective dynamics of transversely illuminated point-scatterers in a 1D trap
• Scattering approach to two-colour light forces and self-ordering of polarizable particles
• Optical forces, torques and force densities calculated at a microscopic level using a self-consistent hydrodynamics method
• Tailored long range forces on polarizable particles by collective scattering of broadband radiation
• Collective scattering and oscillation modes of optically bound point particles trapped in a single mode waveguide field
• Microwave induced elastic deformation of a metallic thin film