Argelia Balbuena Balbuena Ortega
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Felix E. Torres-González
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Valentin López López Gayou
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Raul Delgado Delgado Macuil
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Gaetano Assanto
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We carry out an experimental campaign to investigate the nonlinear self-defocusing propagation of singular light beams with various complex structures of phase and intensity in a colloidal suspension of gold nanoparticles with a plasmonic resonance near the laser wavelength (532nm). Studying optical vortices embedded in Gaussian beams, Bessel vortices and Bessel-cosine (necklace) beams, we gather evidence that while intense vortices turn into two-dimensional dark solitons, all structured wavepackets are able to guide a weak Gaussian probe of different wavelength (632.8 nm) along the dark core. The probe confinement also depends on the topological charge of the singular pump.
Propagation of optical vortices in loop resonators on the basis of multimode optical fibers
