Zobrazeno 1 - 10
of 920
pro vyhledávání: '"B Pinheiro"'
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
Publikováno v:
Frontiers in Molecular Biosciences, Vol 11 (2024)
Directed evolution is a powerful tool that can bypass gaps in our understanding of the sequence-function relationship of proteins and still isolate variants with desired activities, properties, and substrate specificities. The rise of directed evolut
Externí odkaz:
https://doaj.org/article/c1bc1e805d0a446b9d89e7f53b9ac9c8
Publikováno v:
Frontiers in Bioengineering and Biotechnology, Vol 12 (2024)
Cancer is a leading cause of mortality globally, often diagnosed at advanced stages with metastases already present, complicating treatment efficacy. Traditional treatments like chemotherapy and radiotherapy face challenges such as lack of specificit
Externí odkaz:
https://doaj.org/article/cc13b65a926a4caa85e972e1454ebcb1
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:
Acta Médica Portuguesa, Vol 6, Iss 11 (1993)
Clinical manifestations of the antiphospholipid syndrome result from thromboembolic phenomena that occur in all vascular territories. Cardiac manifestations frequently associated with this syndrome include valvular and myocardial lesions. We present
Externí odkaz:
https://doaj.org/article/e322d685be2d469c81e6d1afd439ac7b