Banca de DEFESA: JONATHAS MATIAS DE OLIVEIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JONATHAS MATIAS DE OLIVEIRA
DATE: 03/03/2023
TIME: 14:00
LOCAL: CETEC - Materiais
TITLE:

DIRECT LASER WRITIG MICROFABRICATION OF INTEGRATED OPTICAL DEVICES

KEY WORDS:

microfabrication, ultrafast lasers, direct laser writing, photopolymerization, microoptics, photonics, orbital angular momentum.

PAGES: 88
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUBÁREA: Física da Matéria Condensada
SPECIALTY: Prop. Óticas e Espectrosc. da Mat. Condens; Outras Inter. da Mat. com Rad. e Part.
SUMMARY:

The three-dimensional microfabrication via direct laser writing techniques has opened a
window of opportunities for research and technological applications in several areas such
as optical communication, microfluidics, synthesis of new materials, 3D scaffolding for
cell culture, construction of optical microdevices, and others. The possibility of building
a 3D optical device directly on a substrate or inside a transparent bulk has driven research
groups and engineers around the world to design and develop integrated micro-optical
systems capable of manipulating light signals and making them interact with mechanical,
electronic, fluid, chemical and biological elements. The works developed during this Phd
represents a small but substantial contribution for this line of research. Initially, the twophoton
polymerization technique was used to write a helical axicon, a light micromodulator
able to convert Gaussian beams into structured beams possessing orbital
angular momentum, whose profile is described by a superposition of high-order Bessel
beams. By means of a modifying laser process, we have written channel waveguides
inside silver-doped tellurite glassy blades. The waveguide’s optical properties and the
writing parameters were analyzed as a function of the matrix composition and of the silver
nanoparticles concentration. Finally, we have built annular waveguides, capable for
guiding light beams carrying orbital angular momentum, inside boroaluminosilicate
glassy blades. In addition, we have proposed a coupling method that permits tuning the
guided modes for the same waveguide and no need to modify the input beam. Our findings
expand the available degrees of freedom for optical beams in photonic circuits, simplify
the design of integrated optical chips and broaden the spectrum of possible applications
for these systems.

BANKING MEMBERS:
Externo(a) à Instituição - JOSÉ FERRAZ DE MOURA NUNES FILHO - UFRPE
Externo(a) ao Programa - 1695829 - ANDRE DE LIMA MOURA
Externo(a) à Instituição - CLEBER RENATO MENDONCA - USP
Presidente - 2181152 - EDUARDO JORGE DA SILVA FONSECA
Interno(a) - 2121376 - MARCOS VINICIUS DIAS VERMELHO