1. Guiding light with singular beams in nanoplasmonic colloids.
- Author
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Balbuena Ortega, A., Torres-González, F. E., López Gayou, V., Delgado Macuil, R., Cardoso Sakamoto, J. E. H., Arzola, A. V., Assanto, G., and Volke-Sepulveda, K.
- Subjects
COLLOIDS ,LIGHT propagation ,GOLD nanoparticles ,COLLOIDAL suspensions ,WAVELENGTHS - Abstract
We investigate the nonlinear propagation of light beams with complex phase and intensity structures, including a Gaussian-embedded vortex, a Bessel vortex, and a Bessel-cosine necklace. We employ a colloidal suspension of bio-synthesized plasmonic gold nanoparticles, where a self-defocusing response is mediated by absorption at the laser wavelength (532 nm). We show that, by means of nonlocal nonlinearity, these structured two-dimensional beams with on-axis singularity can counteract the diffraction of the dark core and guide therein a coaxial Gaussian probe of different wavelengths (633 nm) and lower intensities. Angular steering of the confined probe is also demonstrated by tilting the propagation direction of the pump. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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