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Nanoparticles in oxide and chalcogenide glasses: optical nonlinearities and waveguide fabrication by femtosecond laser pulses

Grant number: 11/21434-3
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2012
Effective date (End): October 31, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Cleber Renato Mendonça
Grantee:Juliana Mara Pinto de Almeida
Home Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:11/12399-0 - Femtosecond pulses applied to nonlinear optics: spectroscopy, pulse shaping and microfabrication, AP.TEM
Associated scholarship(s):13/05350-0 - Fabrication of waveguide in chalcogenide glass using laser direct-write processing, BE.EP.DR


The study of nonlinear optical processes, although it is still an area in development, it has been received much attention due to the interest in both generation of new technologies and the basic aspects of the interaction between light and matter. In this context, this PhD project has the objective to study the nonlinear optical properties and the production of waveguides in glassy materials using femtosecond pulses. In the first stage of the project, we intend to study the refractive nonlinear optical response and multi-photon absorption process, spectrally broad (450 nm - 1700 nm) in germanate and tellurite glasses. These glassy systems (XO2-Bi2O3 - PbO with X = Te and Ge), should present high optical nonlinearities due to the presence of highly polarizable ions and, also because their lattice with high refractive index. We will investigate the correlation between the structure and the nonlinear responses of the samples, and we will identify the composition and the range of frequencies in which the material exhibits better performance for photonic applications.At the second stage of the project, we intend to use femtosecond pulses to study the micromachining processes induced by nonlinear interactions in glassy lattice. In this context, we will determine the optimum conditions for micromachining to produce 3D waveguides. This study will be done both germanate and tellurite glasses, which the nonlinear properties will be previously determined, and also in glasses doped with Tb ((CaO-B2O3-Li2O) Tb4O7), which must present magneto-optical properties. From these studies, we intend to produce three-dimensional waveguides inside the bulk of the glasses, as a first step to improve the development of the integrated photonic devices.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MANZANI, DANILO; GUALBERTO, TIAGO; ALMEIDA, JULIANA M. P.; MONTESSO, MURILO; MENDONCA, CLEBER R.; RIVERA, VICTOR A. G.; DE BONI, LEONARDO; NALIN, MARCELO; RIBEIRO, SIDNEY J. L. Highly nonlinear Pb2P2O7-Nb2O5 glasses for optical fiber production. Journal of Non-Crystalline Solids, v. 443, p. 82-90, JUL 1 2016. Web of Science Citations: 9.
ALMEIDA, J. M. P.; ALMEIDA, G. F. B.; HERNANDES, A. C.; MENDONCA, C. R. Architecture of lead oxide microcrystals in glass: a laser and etching based method. CrystEngComm, v. 18, n. 31, p. 5959-5964, 2016. Web of Science Citations: 2.
ALMEIDA, JULIANA M. P.; FONSECA, RUBEN D.; DE BONI, LEONARDO; DINIZ, ANDRE ROSA S.; HERNANDES, ANTONIO C.; FERREIRA, PAULO H. D.; MENDONCA, CLEBER R. Waveguides and nonlinear index of refraction of borate glass doped with transition metals. Optical Materials, v. 42, p. 522-525, APR 2015. Web of Science Citations: 8.

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