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Sobre
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Sobre

Susana Silva é licenciada em Física Aplicada pela Universidade do Porto, Portugal. S. Silva recebeu o Doutoramento em Física pela Universidade do Porto, Portugal, na área dos sensores em fibra ótica para índice de refração e deteção de gás. Atualmente, S. Silva é Investigadora Contratada I&D no Centro de Fotónica Aplicada do INESC TEC. Nos últimos anos, S. Silva publicou mais de 50 artigos em revistas internacionais. S. Silva recebeu o prémio de melhor Tese de Doutoramento em Ótica e Fotónica em 2013. S. Silva é especializada na fabricação de sensores em fibra ótica para monitorização de parâmetros físicos. Os seus atuais interesses de investigação são os sensores óticos para aplicações biomédicas e sensorização distribuída em fibra ótica para aplicações em biodiversidade.

Tópicos
de interesse
Detalhes

Detalhes

003
Publicações

2020

Tuning of Fiber Optic Surface Reflectivity through Graphene Oxide-Based Layer-by-Layer Film Coatings

Autores
Monteiro, CS; Raposo, M; Ribeiro, PA; Silva, SO; Frazao, O;

Publicação
Photonics

Abstract
The use of graphene oxide-based coatings on optical fibers are investigated, aiming to tune the reflectivity of optical fiber surfaces for use in precision sensing devices. Graphene oxide (GO) layers are successfully deposited onto optical fiber ends, either in cleaved or hollow microspheres, by mounting combined bilayers of polyethylenimine (PEI) and GO layers using the Layer-by-Layer (LbL) technique. The reflectivity of optical fibers coated with graphene oxide layers is investigated for the telecom region allowing to both monitor layer growth kinetics and cavity characterization. Tunable reflective surfaces are successfully attained in both cleaved optical fibers and hollow microsphere fiber-based sensors by simply coating them with PEI/GO layers through the LbL film technique.

2020

Curvature detection in a medical needle using a Fabry-Perot cavity as an intensity sensor

Autores
Novais, S; Silva, SO; Frazao, O;

Publicação
Measurement: Journal of the International Measurement Confederation

Abstract
The use of optical sensors inside the needle can improve targeting precision and can bring real-time information about the location of the needle tip if necessary, since a needle bends through insertion into the tissue. Therefore, the precise location of the needle tip is so important in percutaneous treatments. In the current experiment, a fiber sensor based on a Fabry-Perot (FP) cavity is described to measure the needle curvature. The sensor is fabricated by producing an air bubble between two sections of multimode fiber. The needle with the sensor therein was attached at one end and deformed by the application of movements. The sensor presents a sensitivity of -0.152 dB/m-1 to the curvature measurements, with a resolution of 0.089 m-1. The sensory structure revealed to be stable, obtaining a cross-sensitivity to be 0.03 m-1/°C. © 2019 Elsevier Ltd

2020

Curvature Sensor Based on a Long-Period Grating in a Fiber Ring Resonator Interrogated by an OTDR

Autores
Magalhaes, R; Silva, S; Frazao, O;

Publicação
Photonic Sensors

Abstract
The proposed technique demonstrates a fiber ring resonator interrogated by an optical time domain reflectometer (OTDR), for intensity sensing. By using this methodology, a cavity round trip time of 2.85 µs was obtained. For a proof of concept, a long-period grating was inserted in the resonant cavity operating as a curvature sensing device. A novel signal processing approach was outlined, regarding to the logarithmic behavior of the OTDR. Through analyzing the experimental results, an increase in the measured sensitivities was obtained by increasing applied bending. With curvatures performed from 1.8 m-1 to 4.5 m-1, the sensitivity values ranged from 2.94 dB·km-1 to 5.15 dB·km-1. In its turn, the sensitivities obtained presented a linear behavior when studied as a function of the applied curvature, following a slope of 0.86×10-3 dB. The advantages of applying this technique were also discussed, demonstrating two similar fiber rings multiplexed in a series of configurations. © 2019, The Author(s).

2020

Detection of the Crystallization Process of Paracetamol with a Multi-Mode Optical Fiber in a Reflective Configuration

Autores
Soares, L; Novais, S; Ferreira, A; Frazao, O; Silva, S;

Publicação
SENSORS

Abstract
A configuration of a refractometer sensor is described with the aim of optically detecting the crystallization process of paracetamol. The developed sensing head is based on a conventional cleaved multi-mode fiber. The fiber tip sensor structure was submitted to contact with the liquid of interest (paracetamol fully dissolved in 40% v/v of ethanol/water) and the crystallization process of paracetamol, induced with continued exposure to air, was monitored in real time.

2020

Femtosecond laser direct written off-axis fiber Bragg gratings for sensing applications

Autores
Viveiros, D; Amorim, VA; Maia, JM; Silva, S; Frazao, O; Jorge, PAS; Fernandes, LA; Marques, PVS;

Publicação
Optics and Laser Technology

Abstract
First order off-axis fiber Bragg gratings (FBGs) were fabricated in a standard single mode fiber (SMF-28e) through femtosecond laser direct writing. A minimum offset distance between the grating and core center of 2.5 µm was found to create a multimode section, which supports two separate fiber modes (LP0,1 and LP1,1), each split into two degenerate polarization modes. The resulting structure breaks the cylindrical symmetry of the fiber, introducing birefringence (˜10-4) resulting in a polarization dependent Bragg wavelength for each mode. Based on the modal and birefringence behavior, three off-axis FBGs were fabricated with 3.0, 4.5 and 6.0 µm offsets from the core center, and then characterized in strain, temperature, and curvature. The tested off-axis FBGs exhibited a similar strain sensitivity of ~1.14 pm/µ? and a temperature sensitivity of ~12 pm/C. The curvature and orientation angle were simultaneously monitored by analyzing the intensity fluctuation and the wavelength shift of the LP1,1 Bragg resonance. A maximum curvature sensitivity of 0.53 dB/m-1 was obtained for the off-axis FBG with a 3.0 µm offset. © 2020 Elsevier Ltd

Teses
supervisionadas

2018

Estudo e desenvolvimento de sensores refratométricos em fibra ótica para deteção de paracetamol

Autor
Liliana Patrícia Santos Soares

Instituição
UCP

2018

Conceptualização e fabricação de sensores em fibra ótica usando impressora 3D para medição de pressões fisiológicas

Autor
Maria Silva Miguel

Instituição
UCP

2018

Espetroscopia de Raman para aplicações biomédicas

Autor
Diana Filipa Amorim Dantas

Instituição
UCP

2018

New Optical devices based on Graphene for sensing applications

Autor
Catarina da Silva Monteiro

Instituição
UP-FEUP

2018

Endoscopia de Raman em fibra ótica

Autor
João Manuel Ribeiro Jordão

Instituição
UP-FCUP