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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

  • Nationality

    Portugal
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    paulo.v.marques@inesctec.pt
011
Publications

2021

Mach-Zehnder interferometer-based evanescent refractometer inscribed at the surface of Eagle2000 by femtosecond laser writing

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

Publication
IEEE Sensors Journal

Abstract

2021

Wine Marketing Event – The Importance of Emotions in a Wine Tasting for Inexperienced Participants

Authors
de Lima, AP; Pacheco, J; Silva, P;

Publication
Smart Innovation, Systems and Technologies

Abstract
The purpose of this article is to analyse the importance of emotions in a wine tasting experience for inexperienced participants. It is necessary to reduce elitism because customers who are not knowledgeable and inexperienced in wines can also do a wine tasting. They are also important consumers. The empirical study includes a questionnaire (n = 146) applied to inexperienced wine tasting participants. A conceptual model was built, and the results show that the composite of emotions: Comfort and Enthusiasm of participants can have a positive effect on their Satisfaction and consequent Word of Mouth. This study provides a relevant information on how wine companies can effectively promote wine tasting to inexperienced participants, and offer important implications for wine companies, especially for those offering wine tasting experiences to their visitors/customers. These types of participants are potential consumers and have significant importance for the market share. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

2021

Intensity-modulated refractometer based on mode-mismatch in surface waveguides inscribed by femtosecond laser direct writing

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

Publication
OPTICS AND LASER TECHNOLOGY

Abstract
Optical waveguides were fabricated at the surface of Eagle2000 glass substrates, using femtosecond laser direct writing and wet etching, and their potential as intensity-modulated refractometers was assessed. Through the analysis of their broadband spectral response to different refractive index oils, we observed that mode mismatch is present when the guided mode reaches the surface of the substrate and interacts with the external medium, thus enabling the use of such optical waveguides in refractive index sensing. Refractive indices equal to or greater than that of the substrate also induced a coupling mechanism that was shown not to be suitable in these devices. The device's wavelength of operation was found to be tunable by controlling the distance between the surface and the center of the optical waveguide. However, the sensitivity was seen to diminish by increasing the latter, being nonexistent for distances greater than 5.5 mu m. In this study, the maximum sensitivity values were found for a surface to core center distance between 1 and 2 mu m, in the biological range, and 2.5 to 3 mu m, for a refractive index nearing that of the substrate. Accordingly, maximum sensitivities of approximate to 25 dB/RIU and approximate to 1200 dB/RIU were found between 1.300 < n(D)(25)degrees(C) < 1.400 and 1.490 < n(D)(25)degrees(C) < 1.500, respectively.

2021

Loss mechanisms in femtosecond laser written optical waveguides

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

Publication
Proceedings of SPIE - The International Society for Optical Engineering

Abstract
Low loss optical waveguides are the key component for the fabrication of more complex integrated optics devices. In most works related to femtosecond laser written waveguides, the values presented give results at a single wavelength or in a narrow wavelength band; but some applications in optical sensing, for example, would benefit from waveguides having good propagation properties in a larger wavelength range. This paper presents results that allow one to gain insight into the major loss mechanisms present in laser written waveguides in two different types of glasses (fused silica and Eagle 2000 glass) and the dependence of those on the fabrication parameters. Finally, an example of application of broadband operating waveguides is given.

2021

Femtosecond laser micromachining of an optofluidics-based monolithic whispering-gallery mode resonator coupled to a suspended waveguide

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

Publication
SCIENTIFIC REPORTS

Abstract
A monolithic lab-on-a-chip fabricated by femtosecond laser micromachining capable of label-free biosensing is reported. The device is entirely made of fused silica, and consists of a microdisk resonator integrated inside a microfluidic channel. Whispering gallery modes are excited by the evanescent field of a circular suspended waveguide, also incorporated within the channel. Thermal annealing is performed to decrease the surface roughness of the microstructures to a nanometric scale, thereby reducing intrinsic losses and maximizing the Q-factor. Further, thermally-induced morphing is used to position, with submicrometric precision, the suspended waveguide tangent to the microresonator to enhance the spatial overlap between the evanescent field of both optical modes. With this fabrication method and geometry, the alignment between the waveguide and the resonator is robust and guaranteed at all instances. A maximum sensitivity of 121.5 nm/RIU was obtained at a refractive index of 1.363, whereas near the refractive index range of water-based solutions the sensitivity is 40 nm/RIU. A high Q-factor of 10(5) is kept throughout the entire measurement range.

Supervised
thesis

2020

Fabricação de nanoestruturas por fotopolimerização multifotão com laser femtosegundo

Author
José Miguel Trigo de Mesquita e Silva

Institution
UP-FCUP

2020

Fast prototyping of advanced sensing devices using three-dimensional direct writing with femtosecond laser

Author
Vítor Alexandre Oliveira Amorim

Institution
UP-FCUP

2020

Fabrication of opticals Ensing devices by 3D laser  micromachining

Author
Carlos Duarte Rodrigues Viveiros

Institution
UP-FCUP

2019

Fabrication of Optofluidic Systems by Femtosecond Laser Micromachining

Author
João Miguel Mendes da Silva Maia

Institution
UP-FCUP

2019

Fast prototyping of advanced sensing devices using three-dimensional direct writing with femtosecond laser

Author
Vítor Alexandre Oliveira Amorim

Institution
UP-FCUP