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pro vyhledávání: '"Da Silva, B"'
Autor:
de Oliveira, M. Gil, Junior, A. L. S. Santos, Lima, P. M. R., Barbosa, A. C., da Silva, B. Pinheiro, Padua, S., Khoury, A. Z.
In this work we study, both theoretically and experimentally, the tomography of the spatial structure of light. We consider a a spatially structured light mode that is specified by coefficients with respect to some basis, such as the Laguerre-Gaussia
Externí odkaz:
http://arxiv.org/abs/2404.05616
Autor:
de Oliveira, M. Gil, Junior, A. L. S. Santos, Barbosa, A. C., da Silva, B. Pinheiro, Santos, G. H. dos, Cañas, G., Ribeiro, P. H. Souto, Walborn, S. P., Khoury, A. Z.
We investigate theoretically and experimentally the optical second harmonic generation (SHG) with a twisted Gaussian Schell model (TGSM) beam as the fundamental field. We use Type-II phase matching and analyze the cross spectral density (CSD) of the
Externí odkaz:
http://arxiv.org/abs/2403.04040
Autor:
Almeida, F., Sousa, I., Kremer, O., da Silva, B. Pinheiro, Tasca, D. S., Khoury, A. Z., Temporão, G., Guerreiro, T.
Publikováno v:
Phys. Rev. Lett. 131, 163601 (2023)
We experimentally demonstrate stable trapping and controlled manipulation of silica microspheres in a structured optical beam consisting of a dark focus surrounded by light in all directions - the so-called Dark Focus Tweezer. Results from power spec
Externí odkaz:
http://arxiv.org/abs/2302.01953
Autor:
da Silva, B. Pinheiro, Santos, G. H. dos, de Oliveira, A. G., da Silva, N. Rubiano, Buono, W. T., Gomes, R. M., Soares, W. C., Jesus-Silva, A. J., Fonseca, E. J. S., Ribeiro, P. H. Souto, Khoury, A. Z.
A triangular-lattice pattern is observed in light beams resulting from the spatial cross modulation between an optical vortex and a triangular shaped beam undergoing parametric interaction. Both up- and down-conversion processes are investigated, and
Externí odkaz:
http://arxiv.org/abs/2206.06153
Autor:
da Silva, B. Pinheiro, Buono, W. T., Pereira, L. J., Tasca, D. S., Dechoum, K., Khoury, A. Z.
We demonstrate the spin to orbital angular momentum transfer in the nonlinear mixing of structured light beams. A vector vortex is coupled to a circularly polarized Gaussian beam in noncollinear second harmonic generation under type-II phase match. T
Externí odkaz:
http://arxiv.org/abs/2108.13190
Autor:
da Silva, B. Pinheiro, Marques, B. A. D., Rodrigues, R. B., Ribeiro, P. H. Souto, Khoury, A. Z.
Publikováno v:
Phys. Rev. A 103, 063704 (2021)
We developed a method to characterize arbitrary superpositions of light orbital angular momentum (OAM) with high fidelity by using astigmatic tomography and machine learning processing. In order to define each superposition unequivocally, we combine
Externí odkaz:
http://arxiv.org/abs/2012.00167
Autor:
Melo, Bruno, Brandão, Igor, da Silva, B. Pinheiro, Rodrigues, R. B., Khoury, A. Z., Guerreiro, Thiago
Publikováno v:
Phys. Rev. Applied 14, 034069 (2020)
The superposition of a Gaussian mode and a Laguerre-Gauss mode with $\ell=0,p\neq0$ generates the so-called bottle beam: a dark focus surrounded by a bright region. In this paper, we theoretically explore the use of bottle beams as an optical trap fo
Externí odkaz:
http://arxiv.org/abs/2006.15455
Publikováno v:
Phys. Rev. Lett. 124, 033902 (2020)
We investigate pattern revivals in specially designed optical structures that combine different transverse modes. In general, the resulting pattern is not preserved under free propagation and gets transformed due to non synchronized Gouy phases. Howe
Externí odkaz:
http://arxiv.org/abs/1908.01740
Akademický článek
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Publikováno v:
Phys. Rev. A 99, 043820 (2019)
We use astigmatic transformations to characterize two-dimensional superpositions of Orbital Angular Momentum (OAM) states in laser beams. We propose two methods for doing this, both relying only on astigmatic transformations, viewed as rotations on t
Externí odkaz:
http://arxiv.org/abs/1811.02939