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Sobre

Sobre

Paulo Marques nasceu em Coruche, Portugal, em 1968. Licenciou-se em Física em 1991, concluiu o mestrado em Optoelectrónica e Lasers em 1995 e doutorou-se em Física em 2000 (todos os graus pela Universidade do Porto); é Professor Auxiliar no Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto desde 2002.

Desde Julho de 2000 que desenvolve a sua actividade de investigação no INESC Porto, onde tem sido responsável por diversos projetos nacionais e internacionais. Os seus interesses situam-se nos domínios da óptica guiada e microfabricação (guias de onda , sensores ópticos, fotosensibilidade, processos de escrita direta a laser com impulsos ultracurtos, etc). Publicou 33 patentes das quais 32 são internacionais, mais de 100 artigos em revistas e conferências internacionais e dois capítulos de livros. Desde Outubro de 2009 é o Coordenador do Centro de Fotónica Aplicada do INESCTEC e desde Maio de 2013 é também o Coordenador da Unidade de Micro e Nanofabricação (MNTEC) do Centro de Materiais da Univerisdade do Porto (CEMUP).

Tópicos
de interesse
Detalhes

Detalhes

009
Publicações

2019

Loss Mechanisms of Optical Waveguides Inscribed in Fused Silica by Femtosecond Laser Direct Writing

Autores
Amorim, VA; Maia, JM; Viveiros, D; Marques, PVS;

Publicação
Journal of Lightwave Technology

Abstract

2019

High Performance Titanium oxide coated D-shaped Optical Fiber Plasmonic Sensor

Autores
Gangwar, RK; Amorim, VA; Marques, PVS;

Publicação
IEEE Sensors Journal

Abstract

2019

Spectral characteristics of optical waveguides fabricated in glass by femtosecond laser direct writing

Autores
Amorim, VA; Viveiros, D; Maia, JM; Marques, PVS;

Publicação
Proceedings of SPIE - The International Society for Optical Engineering

Abstract
The fabrication of optical waveguides with femtosecond laser direct writing is reported in two materials, Suprasil1 and Eagle2000. The influence of typical fabrication parameters, such as pulse energy and scan velocity, on the waveguide's spectral characteristics is explored from 500 to 1700 nm. Tests conducted in Suprasil1 evidence a strong presence of Rayleigh scattering, hindering the production of low-loss waveguides at short wavelengths. On the other hand, optical waveguides fabricated in Eagle2000 exhibited lower insertion losses at short wavelengths, enabling the fabrication of low-loss broadband optical waveguides with a two order of magnitude higher scan velocity when compared with Suprasil1. © 2019 SPIE.

2019

Femtosecond laser micromachining of Fabry-Pérot interferometers in fused silica for refractive index sensing

Autores
Maia, JM; Amorim, VA; Viveiros, D; Marques, PVS;

Publicação
Proceedings of SPIE - The International Society for Optical Engineering

Abstract
A Fabry-Pérot interferometer was fabricated inside a fused silica substrate through femtosecond laser micromachining. The influence of the waveguide's writing parameters on the measured signal's quality was studied for an interferometer with a 27-µm wide cavity. Optimal signal-to-noise ratio and fringe visibility were obtained for waveguides written at 75 nJ and 50 µm/s. The same device was characterized with different refractive index liquids, and a maximum sensitivity of 1181.4±23.6 nm/RIU was obtained in the index range of 1.2962 to 1.3828 (at 1550 nm) for the spectral order o?'š = 46. © 2019 SPIE.

2019

Mass Producible Low-Loss Broadband Optical Waveguides in Eagle2000 by Femtosecond Laser Writing

Autores
Amorim, VA; Viveiros, D; Maia, JM; Marques, PVS;

Publicação
IEEE PHOTONICS TECHNOLOGY LETTERS

Abstract
Optical waveguides were fabricated in alkaline earth boro-aluminosilicate glass, by femtosecond laser direct writing, with varying pulse energy and scan velocity. A spectral characterization, from 500 nm to 1700 nm, was made in order to determine their losses and understand its dependence on the processing parameters. Three major loss mechanisms were identified. At longer wavelengths, loss is mainly due to weak coupling. On the other hand, the behavior at shorter wavelengths is governed by propagation loss due to Rayleigh scattering, which was shown to be practically eliminated (& x003C; 0.05 dB $\cdot$ cm $<^>{-1} {\cdot }\,\,\mu \text{m}<^>{4}$ ) at higher scan velocities. Bulk absorption was also found to have an influence in the propagation losses at higher wavelengths. The combination of intermediate pulse energies (between 125-250 nJ) and high scan velocities (above 6 cm/s) allowed the fabrication of optical waveguides offering low losses across the entire range of wavelengths tested, facilitating applications that require larger wavelength working bands. Furthermore, since optimal fabrication conditions are achieved at higher scanning velocities, mass production with reduced fabrication times can be achieved.

Teses
supervisionadas

2017

Fabrication of opticals Ensing devices by 3D laser  micromachining

Autor
Carlos Duarte Rodrigues Viveiros

Instituição
UP-FCUP

2017

High Power Fiber Lasers and Amplifiems -Power Scaling and Performance limitations

Autor
Miguel Alexandre Ramos de Melo

Instituição
UP-FCUP

2016

FemtoEtch – Femtosecond Laser Micromachining and Applications in Microfluidics and Optofluidics

Autor
João Miguel Mendes da Silva Maia

Instituição
UP-FCUP

2016

Determinação das condições ótimas de fabricação de componentes óticos revestidos fabricados a partir de vidros fluoro-fosfatados

Autor
Tomás Freire Barbas de Albuquerque

Instituição
UP-FCUP

2016

Fabrication of Integrated Optical Devices in Fused Silica by Femtosecond Laser Direct Writing

Autor
Vítor Alexandre Oliveira Amorim

Instituição
UP-FCUP