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Gaspar Mendes do Rego

Resumo biográfico

Licenciado em Física (Optoelectrónica) pela Faculdade de Ciências da Universidade do Porto (FCUP-1992). MSc in The Physics of Laser Communications pela Universidade de Essex, Inglaterra (1994), com equivalência ao grau de Mestre em Optoelectrónica e Lasers pela FCUP (1996). Doutor em Ciências de Engenharia pela Faculdade de Engenharia da Universidade do Porto (FEUP-2006) e Agregação em Física pela FCUP (2013). Atualmente é Professor Coordenador Principal do Instituto Politécnico de Viana do Castelo, Investigador Integrado na Unidade de Investigação em Materiais, Energia e Ambiente para a Sustentabilidade (proMetheus) e Investigador Colaborador no Centro de Fotónica Aplicada (CAP-Center of Applied Photonics) do INESC Tecnologia e Ciência (INESC TEC). Anteriormente, foi Presidente/Vice-Presidente do Conselho Técnico-Científico do IPVC (4+4 anos), Coordenador do Curso de Engenharia Electrónica e Redes de Computadores (EERC, 5 anos), Coordenador/Vice-Coordenador do Grupo Disciplinar de Física e Química (GD F&Q, 2+2 anos), Responsável pelo Subgrupo de Física (11 anos), Membro do Conselho Científico da ESTG/Comissão Técnico-Científica da ESTG (20 anos), Membro do Conselho Geral do IPVC (4 anos), Membro da Comissão de Avaliação Institucional do IPVC (Coordenador da ESTG, 3 anos) e Secretário do Conselho Científico (1,5 anos). Foi ainda membro do Conselho Pedagógico (3 anos), membro da Assembleia de Representantes da ESTG (4 anos), membro das comissões de curso de EERC e de Engenharia de Sistemas de Energias Renováveis (4 anos), Coordenador Adjunto do Departamento de Ciências Básicas e da Computação (6 meses) e Responsável do Laboratório de Física (6 anos). É autor de mais de uma centena de artigos científicos na área dos componentes em fibra ótica e é revisor em 31 revistas da especialidade. Os tópicos de interesse centram-se nas áreas das comunicações óticas e dos sensores de fibra ótica e também na sustentabilidade ambiental, energias renováveis e eficiência energética.

Contacto(s)

ORCID

0000-0001-8807-4108

Ciência ID

Área Cientifica / Grupo Disciplinar

Ciências Exactas

Cargo

Professor Coordenador Principal

Publicações

Temperature Dependence of the Thermo-Optic Coefficient of SiO₂ Glass

Rego G. (2023) Temperature Dependence of the Thermo-Optic Coefficient of SiO₂ Glass. Sensors

This paper presents a thorough analysis on the temperature dependence of the thermo-optic coefficient, dn/dT, of four bulk annealed pure-silica glass samples (type I—natural quartz: Infrasil 301; type II—quartz crystal powder: Heraeus Homosil; type III—synthetic vitreous silica: Corning 7980 and Suprasil 3001) from room temperature down to 0 K. The three/four term temperature dependent Sellmeier equations and respective coefficients were considered, which results from fitting to the raw data obtained by Leviton et al. The thermo-optic coefficient was extrapolated down to zero Kelvin. We have obtained dn/dT values ranging from 8.16 × 10−6 up to 8.53 × 10−6 for the four samples at 293 K and for a wavelength of 1.55 μm. For the Corning 7980 SiO2 glass, the thermo-optic coefficient decreases monotonically, from 8.74 × 10−6 down to 8.16 × 10−6, from the visible range up to the third telecommunication window, being almost constant above 1.3 μm. The Ghosh’s model was revisited, and it was concluded that the thermal expansion coefficient only accounts for about 2% of the thermo-optic coefficient, and we have obtained an expression for the temperature behavior of the silica excitonic bandgap. Wemple’s model was also analyzed where we have also considered the material dispersion in order to determine the coefficients and respective temperature dependences. The limitations of this model were also discussed.

High Sensitivity Cryogenic Temperature Sensors Based on Arc-Induced Long-Period Fiber Gratings

Oleg Ivanov., P. Caldas., Gaspar Rego. (2022) High Sensitivity Cryogenic Temperature Sensors Based on Arc-Induced Long-Period Fiber Gratings. Sensors

Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front

Oleg V. Ivanov, Paulo Caldas., Gaspar Rego. (2021) Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front. Sensors

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

Gaspar Rego., Paulo Caldas., Oleg V. Ivanov (2021) Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing. Sensors

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part I: Fabrication, Characterization and Mechanisms of Formation

Gaspar Rego., Paulo Caldas., Oleg V. Ivanov (2021) Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part I: Fabrication, Characterization and Mechanisms of Formation. Sensors

Optical Fiber Interferometers Based on Arc-Induced Long Period Gratings at INESC TEC

Paulo Caldas., Gaspar Rego. (2021) Optical Fiber Interferometers Based on Arc-Induced Long Period Gratings at INESC TEC. Sensors

In this work, we review the most important achievements of an INESC TEC long-period-grating-based fiber optic Michelson and Mach–Zehnder configuration modal interferometer with coherence addressing and heterodyne interrogation as a sensing structure for measuring environmental refractive index and temperature. The theory for Long Period Grating (LPG) interferometers and coherence addressing and heterodyne interrogation is presented. To increase the sensitivity to external refractive index and temperature, several LPG interferometers parameters are studied, including order of cladding mode, a reduction of the fiber diameter, different type of fiber, cavity length and the antisymmetric nature of cladding modes.

Etched LPFGs in Reflective Configuration for Sensitivity and Attenuation Band Depth Increase

Del Villar I., Socorro A.B., Corres J.M., Matias I.R., Cruz J.L., Rego G. (2016) Etched LPFGs in Reflective Configuration for Sensitivity and Attenuation Band Depth Increase. IEEE Photonics Technology Letters

Arc-induced long-period fiber gratings in the dispersion turning points

Colaço C., Caldas P., Del Villar I., Chibante R., Rego G. (2016) Arc-induced long-period fiber gratings in the dispersion turning points. Journal of Lightwave Technology

Arc-Induced Long Period Fiber Gratings

Rego G. (2016) Arc-Induced Long Period Fiber Gratings. Journal of Sensors

Long period fiber gratings produced by the electric arc technique have found an increasing interest by the scientific community due to their ease to fabricate, virtually enabling the inscription in any kind of fiber, low cost, and flexibility. In 2005 we have presented the first review on this subject. Since then, important achievements have been reached such as the identification of the mechanisms responsible for gratings formation, the type of symmetry, the conditions to increase fabrication reproducibility, and their inscription in the turning points with grating periods below 200 μm. Several interesting applications in the sensing area, including those sensors working in reflection, have been demonstrated and others are expected, namely, related to the monitoring of extreme temperatures, cryogenic and high temperatures, and high sensitivity refractometric sensors resulting from combining arc-induced gratings in the turning points and the deposition of thin films in the transition region. Therefore, due to its pertinence, in this paper we review the main achievements obtained concerning arc-induced long period fiber gratings, with special focus on the past ten years.

Arc-Induced Gratings in the Turning Points

Colaço C., Caldas P., Chibante R., Rego G. (2015) Arc-Induced Gratings in the Turning Points. SPIE Proceedings

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Gaspar Mendes do Rego

Professor Coordenador Principal

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