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About

About

Paulo Marques was born in Portugal in 1968. He received a degree in Physics (1991), a MSc in Optoelectronics and Lasers (1995) and a PhD in Physics (2000), all from the University of Porto, Portugal. From Nov. 1999 he was appointed as Teaching Assistant in University of Trás-os-Montes e Alto Douro. In 2001, he joined the Faculty of Science from University of Porto as an Assistant Professor.

Since July 2000 he develops research activity in the Optoelectronics and Electronics Systems Unit (UOSE) of INESC PORTO, being responsible for several National and European research contracts. His current research interests include integrated optical sensors, laser direct writing techniques for integrated optics and microfabrication in general, microfluidics, Bragg gratings, optical photosensitivity. More recently has been involved in laser processing with ultrafast lase sources. Has published 4 world patents (patent family of 32) and published more than 100 scientific papers in international magazines and conferences and three book chapters.

Since October 2009 is the coordinator of the Center of Applied Photonics of INESCTEC (former Optoelectronics and Electronics Systems Unit). From May 2013 is also the director of the Micro and Nanofabrication Center of Porto University (CEMUP MNTEC).

Interest
Topics
Details

Details

005
Publications

2017

Optimization of Broadband Y-Junction Splitters in Fused Silica by Femtosecond Laser Writing

Authors
Amorim, VA; Maia, JM; Alexandre, D; Marques, PVS;

Publication
IEEE PHOTONICS TECHNOLOGY LETTERS

Abstract
Optical Y-junction power splitters owe their inherent broadband spectral behavior to their design. However, depending on the fabrication technique employed, asymmetries in the junction might arise, perturbing its performance; this is the case in femtosecond laser written Y-junctions where one arm is typically written over the top of the other. In this letter, the spectral behavior of Y-junctions fabricated in fused silica by the femtosecond laser direct writing technique was analyzed and optimized for the first time, to the best of our knowledge. The junction arms output power balance as well as the corresponding spectral flatness between 1300 and 1600 nm is substantially increased by the implementation of an initial separation between the arms at the junction diverging point, enabling the manufacturing of balanced broadband Y-junctions.

2017

Real-Time Optical Monitoring of Etching Reaction of Microfluidic Channel Fabricated by Femtosecond Laser Direct Writing

Authors
Maia, JM; Amorim, VA; Alexandre, D; Marques, PVS;

Publication
JOURNAL OF LIGHTWAVE TECHNOLOGY

Abstract
Femtosecond laser direct writing is a three dimensional fabrication technique that can be applied to produce integrated optical components with high spatial resolution or microfluidic channels when combined with HF etching. The same fabrication technique can thus be employed to produce monolithic optofluidic devices for sensing applications. One of the most common sensing schemes involves evanescent optical interaction; therefore, the channel must meet some requirements regarding surface roughness, which will depend on the laser writing conditions, as described in this paper. However, of more significance is the distance between waveguiding medium and microfluidic channel that must be accurately defined. This control can be achieved by monitoring the etching reaction of a waveguide grating written a few microns from the channel, as introduced in this paper. In addition to its function as an etching monitor, the grating can also be used as a coarse refractive index sensor device.

2017

Fabrication of Microfluidic Channels by Femtosecond Laser Micromachining and Application in Optofluidics

Authors
Maia, JM; Amorim, VA; Alexandre, D; Marques, PVS;

Publication
PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON PHOTONICS, OPTICS AND LASER TECHNOLOGY (PHOTOPTICS)

Abstract
Micromachining with femtosecond laser can be exploited to fabricate optical components and microfluidic channels in fused silica, due to internal modification of the glass properties that is induced by the laser beam. In this paper, we refer to the formation of microfluidic channels, where an optimization of the fabrication procedure was conducted by examining etch rate and surface roughness as a function of the irradiation conditions. Microfluidic channels with high and uniform aspect ratio and with smooth sidewalls were obtained, and such structures were successfully integrated with optical components. The obtained results set the foundations towards the development of new optofluidic devices.

2017

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

Authors
Amorim, VA; Maia, JM; Alexandre, D; Marques, PVS;

Publication
PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON PHOTONICS, OPTICS AND LASER TECHNOLOGY (PHOTOPTICS)

Abstract
1xN (N=2, 3, 4) MMI power splitters were fabricated in a fused silica substrate by laser direct writing, using a focused 515 nm amplified femtosecond laser beam, and characterized at 1550 nm. To accomplish this, several low loss waveguides were fabricated side by side to form a multimode waveguide with the output in a polished facet of the substrate, while a single low loss waveguide was fabricated to inject light in the centre of the multimode waveguide. The performance of the fabricated devices was optimized by testing three different designs.

2017

Monolithic Add–Drop Multiplexers in Fused Silica Fabricated by Femtosecond Laser Direct Writing

Authors
Amorim, VA; Maia, JM; Alexandre, D; Marques, PVS;

Publication
Journal of Lightwave Technology

Abstract

Supervised
thesis

2017

Fabrication of opticals Ensing devices by 3D laser  micromachining

Author
Carlos Duarte Rodrigues Viveiros

Institution
UP-FCUP

2017

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

Author
Miguel Alexandre Ramos de Melo

Institution
UP-FCUP

2016

FemtoEtch – Femtosecond Laser Micromachining and Applications in Microfluidics and Optofluidics

Author
João Miguel Mendes da Silva Maia

Institution
UP-FCUP

2016

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

Author
Tomás Freire Barbas de Albuquerque

Institution
UP-FCUP

2016

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

Author
Vítor Alexandre Oliveira Amorim

Institution
UP-FCUP