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About

About

Luís Carlos Costa Coelho received his graduation in Physics Engineering in 2006 and MSc in Instrumentation and Microelectronics in 2007 both by University of Coimbra in Portugal. At the Physics Department of the same University he developed research in Atomic and Nuclear Instrumentation with focus on gaseous scintillation counters towards high energy radiation. In this context he was directly involved in the international experience "Xenon Direct Dark Matter Search" at the National Laboratory of Gran Sasso in Italy, aiming search dark matter through the detection of weakly interacting massive particles. In 2010 he started to working in optical fibre sensors at the Optoelectronics and Electronic Systems of INESC Porto in Portugal, mainly applied to hydrogen detection under the project MICROPHYTE-Metabolic engineering of chlamydomonas and environmental optimization for hydrogen production and release. In 2016 received his Ph.D. degree in Physics at the University of Porto, Porto, Portugal with the focus on thin films technology applied to optical fibre sensors in collaboration with the now Centre for Applied Photonics of INESC TEC, Porto, Portugal. He?s research involves the study of coating types for gases and liquids detection, in particular hydrogen, for refractometers with surface plasmon resonance and for high refractive index samples monitoring with coated long period fibre gratings. He?s current research interests includes bio and chemical sensors based on thin film coating technology of particular structures as long period fibre gratings, fibre Bragg gratings, using surface plasmon resonance phenomenon. He is currently a Post-doc Researcher working in the project MARINEYE at INESC TEC ? A prototype for multitrophic oceanic monitoring developing sensors for dissolved carbon dioxide detection using colorimetric and refractometer platforms combined with new designs of optical fibre structures. In the last few years, he has published more than 47 papers in international journals with referee and over 35 papers in national and international conferences with more than 1350 citations and an h index of 13. He has been referee in a wide range of international journals as IEEE, OSA, SPIE, Elsevier, Pier, MDPI and Springer. He was also the president of the University of Porto SPIE Student Chapter in 2014 and a member of the organization team of the 9th Advanced Study Course on Optical Chemical Sensors and Biosensors (ASCOS 2015). Luis Coelho is a member of SPIE.

Interest
Topics
Details

Details

  • Nationality

    Portugal
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    luis.c.coelho@inesctec.pt
007
Publications

2021

Femtosecond laser-written long period fibre gratings coated with titanium dioxide for improved sensitivity

Authors
Viveiros, D; de Almeida, JMMM; Coelho, L; Vasconcelos, H; Amorim, VA; Maia, JM; Jorge, PAS; Marques, PVS;

Publication
Optical Sensing and Detection VI

Abstract

2021

Preliminary assessment on the detection of putrescine using long period fiber gratings coated with titanium dioxide and poly(ethylene-co-vinyl acetate)

Authors
Vasconcelos, H; de Almeida, JMMM; Saraiva, C; Viveiros, D; Jorge, PAS; Coelho, L;

Publication
Proceedings of SPIE - The International Society for Optical Engineering

Abstract
Biogenic amines, such as putrescine are potential indicators of food storage condition and deterioration. The real time measurement of their concentration in food may become an important method of food control. It was found that putrescine diffuses through a thin layer made from a solution of Poly(ethylene-co-vinyl acetate) (PEVA) and maleic anhydride. Poly(ethylene-co-vinyl acetate) is a common non-chlorinated vinyl capable to adsorb specific analytes as putrescine which upon diffusion, reversibly binds to the maleic anhydride causing the polymer swelling resulting in spectral changes from the optical point of view. Long Period Fiber Gratings coated with 30 nm titanium dioxide, a high refractive index material used to increase the intrinsic sensitivity to the external refractive index, were overcoated with a thin layer of maleic anhydride doped Poly(ethylene-co-vinyl acetate). When exposed to solutions containing small concentrations of putrescine the resonant band corresponding to the LP1,6 cladding mode was found to move to shorter wavelengths. The observed blue shift corresponds to the increasing concentration of putrescine in the fiber sensor structure. Further work is being carried out to improve the sensitivity and the limit of detection of the sensing system as well as to increase range of operation, which is presently limited to 0.3 to 0.5 M. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

2021

Biosensors for Biogenic Amines: A Review

Authors
Vasconcelos, H; Coelho, LCC; Matias, A; Saraiva, C; Jorge, PAS; de Almeida, JMMM;

Publication
Biosensors

Abstract
Biogenic amines (BAs) are well-known biomolecules, mostly for their toxic and carcinogenic effects. Commonly, they are used as an indicator of quality preservation in food and beverages since their presence in higher concentrations is associated with poor quality. With respect to BA’s metabolic pathways, time plays a crucial factor in their formation. They are mainly formed by microbial decarboxylation of amino acids, which is closely related to food deterioration, therefore, making them unfit for human consumption. Pathogenic microorganisms grow in food without any noticeable change in odor, appearance, or taste, thus, they can reach toxic concentrations. The present review provides an overview of the most recent literature on BAs with special emphasis on food matrixes, including a description of the typical BA assay formats, along with its general structure, according to the biorecognition elements used (enzymes, nucleic acids, whole cells, and antibodies). The extensive and significant amount of research that has been done to the investigation of biorecognition elements, transducers, and their integration in biosensors, over the years has been reviewed.

2021

Development of a Long Period Fiber Grating Interrogation System Using A Multimode Laser Diode

Authors
Silva, LH; Santos, P; Coelho, LCC; Jorge, P; Baptista, JM;

Publication
Sensors

Abstract
Optical fiber gratings have long shown their sensing capabilities. One of the main challenges, however, is the interrogation method applied, since typical systems tend to use broadband light sources with optical spectrum analyzers, laser scanning units or CCD (Charged Coupled Device) spectrometers. The following paper presents the development of an interrogation system, which explores the temperature response of a multimode laser diode, in order to interrogate long period fiber gratings. By performing a spectral sweep along one of its rejection bands, a discrete attenuation spectrum is created. Through a curve fitting technique, the original spectrum is restored. The built unit, while presenting a substantially reduced cost compared with typical interrogation systems, is capable of interrogating along a 10 nm window with measurement errors reaching minimum values as low as 0.4 nm, regarding the grating central wavelength, and 0.4 dB for its attenuation. Given its low cost and reduced dimensions, the developed system shows potential for slow-changing field applications.

2021

Advances in plasmonic sensing at the nir—a review

Authors
Dos Santos, PSS; De Almeida, JMMM; Pastoriza Santos, I; Coelho, LCC;

Publication
Sensors

Abstract
Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) are among the most common and powerful label-free refractive index-based biosensing techniques available nowadays. Focusing on LSPR sensors, their performance is highly dependent on the size, shape, and nature of the nanomaterial employed. Indeed, the tailoring of those parameters allows the development of LSPR sensors with a tunable wavelength range between the ultra-violet (UV) and near infra-red (NIR). Furthermore, dealing with LSPR along optical fiber technology, with their low attenuation coefficients at NIR, allow for the possibility to create ultra-sensitive and long-range sensing networks to be deployed in a variety of both biological and chemical sensors. This work provides a detailed review of the key science underpinning such systems as well as recent progress in the development of several LSPR-based biosensors in the NIR wavelengths, including an overview of the LSPR phenomena along recent developments in the field of nanomaterials and nanostructure development towards NIR sensing. The review ends with a consideration of key advances in terms of nanostructure characteristics for LSPR sensing and prospects for future research and advances in this field. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Supervised
thesis

2020

Development of cost-effective monitoring systems for chemical water contamination using nanoparticle coated optical fibre sensors

Author
Paulo Sérgio Soares dos Santos

Institution
INESCTEC

2020

Development of optical sensors for public health

Author
Ana Beatriz Matias Teixeira

Institution
INESCTEC

2020

Development of a hybrid CO2 monitoring system using spectral characteristics of a sensitive chemical membrane

Author
Nuno Alexandre Pereira Mendes

Institution
INESCTEC

2018

Development of a low-cost interrogation system platform for corrosion sensors in offshore metallic structures

Author
Paulo Sérgio Soares dos Santos

Institution
UP-FCUP