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About

Susana Silva is graduated in Applied Physics from the University of Porto, Portugal. She received the Ph.D. degree in Physics at the University of Porto, Portugal, on optical fiber sensors for refractive index and gas sensing. She is currently an R&D Researcher at the Center for Applied Photonics at INESC TEC. In the last few years, S. Silva has published more than 50 papers in international journals. S. Silva received the prize for best PhD Theses in Optics and Photonics of 2013. Her field of expertise is the fabrication of optical fiber sensors for monitoring of physical parameters. Her current research interests are optical sensors for biomedical applications and distributed fiber optic sensing for biodiversity applications.

Interest
Topics
Details

Details

  • Nationality

    Portugal
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    susana.o.silva@inesctec.pt
003
Publications

2021

Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

Authors
Raposo, M; Xavier, C; Monteiro, C; Silva, S; Frazao, O; Zagalo, P; Ribeiro, PA;

Publication
Photonics

Abstract
Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

2021

Acoustic Optical Fiber Sensor Based on Graphene Oxide Membrane

Authors
Monteiro, CS; Raposo, M; Ribeiro, PA; Silva, SO; Frazão, O;

Publication
Sensors

Abstract
A Fabry–Pérot acoustic sensor based on a graphene oxide membrane was developed with the aim to achieve a faster and simpler fabrication procedure when compared to similar graphene-based acoustic sensors. In addition, the proposed sensor was fabricated using methods that reduce chemical hazards and environmental impacts. The developed sensor, with an optical cavity of around 246 µm, showed a constant reflected signal amplitude of 6.8 ± 0.1 dB for 100 nm wavelength range. The sensor attained a wideband operation range between 20 and 100 kHz, with a maximum signal-to-noise ratio (SNR) of 32.7 dB at 25 kHz. The stability and sensitivity to temperatures up to 90 °C was also studied. Moreover, the proposed sensor offers the possibility to be applied as a wideband microphone or to be applied in more complex systems for structural analysis or imaging.

2020

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

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

Publication
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

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

Publication
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

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

Publication
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).

Supervised
thesis

2020

Desenvolvimento de sensores óticos para aplicações biomiméticas

Author
António José Meireles Martins

Institution
INESCTEC

2020

Raman Endoscopy Using Optical Fiber Technology

Author
João Pedro Marques

Institution
INESCTEC

2020

Estudo e desenvolvimento de novas configurações de sensores em fibra ótica para monitorização de cristalizadores na área farmacêutica

Author
Liliana Patrícia Santos Soares

Institution
INESCTEC

2018

Endoscopia de Raman em fibra ótica

Author
João Manuel Ribeiro Jordão

Institution
UP-FCUP

2018

New Optical devices based on Graphene for sensing applications

Author
Catarina da Silva Monteiro

Institution
UP-FEUP