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We demonstrate stable beam self-trapping in soft-matter systems with artificial saturable self-focusing nonlinearities. Our experiments reveal optical beam interactions that can vary from attractive to repulsive as well as an energy exchange.
Aqueous suspensions containing pure gold nanoparticles and silica-gold core-shells are shown to exhibit different polarizibilities, thus allowing self-trapping of long needles of light. The different nonlinear mechanisms behind these processes are investigated.
We demonstrate optical trapping and rotation of microparticles and bacteria with propelling beams. The rotation is achieved in a tweezers-like setting and fully controlled by SLM without the need of mechanical movement or phase-sensitive interference.
We show how a superposition of non-interfering plane waves can generate a transverse Poynting vector, which in turn leads to transverse optical forces on a fully isotropic dielectric scatterer, in contrast with conventional radiation-pressure forces.
Förster resonance energy transfer from a two-photon absorber to a photochromic spirooxazine are investigated by one- and two-photon absorption. Upon energy transfer, fluorescence of the donor is quenched while that of the photochromic is enhanced.
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