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About

About

Nuno Azevedo Silva graduated in Physics in 2011 at the Faculty of Sciences of University of Porto and concluded is Msc degree in Physics at University of Porto two years later(2013). Following a brief experience under a scientific research grant, he engaged in the MAP-fis doctoral programme and is currently pursuing his PhD in Physics developing his activities at the Centre for Applied Photonics at INESC TEC.  His research interests include both Nonlinear and Quantum Optics, with particular interest in the nonlinear quantum-enhanced optical properties of atomic systems. His past research also included the study of Bose-Einstein condensates and computational Physics, with focus on high performance heterogeneous computing and GPU-accelerated solutions.

Interest
Topics
Details

Details

  • Nationality

    Portugal
  • Centre

    Applied Photonics
  • Contacts

    +351220402301
    nuno.a.silva@inesctec.pt
007
Publications

2023

Intelligent grids for faster elemental mapping with Laser-induced breakdown spectroscopy

Authors
Capela, D; Ferreira, M; Lima, A; Jorge, P; Guimarães, D; Silva, NA;

Publication
Results in Optics

Abstract

2023

Interactive three-dimensional chemical element maps with laser-induced breakdown spectroscopy and photogrammetry

Authors
Lopes, T; Rodrigues, P; Cavaco, R; Capela, D; Ferreira, FS; Guimarães, D; Jorge, AS; Silva, A;

Publication
Spectrochimica Acta - Part B Atomic Spectroscopy

Abstract

2023

Exploring the hidden dimensions of an optical extreme learning machine

Authors
Silva, D; Ferreira, T; Moreira, FC; Rosa, CC; Guerreiro, A; Silva, NA;

Publication
JOURNAL OF THE EUROPEAN OPTICAL SOCIETY-RAPID PUBLICATIONS

Abstract
Extreme Learning Machines (ELMs) are a versatile Machine Learning (ML) algorithm that features as the main advantage the possibility of a seamless implementation with physical systems. Yet, despite the success of the physical implementations of ELMs, there is still a lack of fundamental understanding in regard to their optical implementations. In this context, this work makes use of an optical complex media and wavefront shaping techniques to implement a versatile optical ELM playground to gain a deeper insight into these machines. In particular, we present experimental evidences on the correlation between the effective dimensionality of the hidden space and its generalization capability, thus bringing the inner workings of optical ELMs under a new light and opening paths toward future technological implementations of similar principles.

2022

Nematic Liquid Crystals as a Tabletop Platform for Studying Turbulence

Authors
Ferreira, TD; Silva, NA; Guerreiro, A;

Publication
U.Porto Journal of Engineering

Abstract
Light propagating in nonlinear optical materials opens the possibility to emulate quantum fluids of light with accessible tabletop experiments by taking advantage of the hydrodynamical interpretation. In this context, various optical materials have been studied in recent years, with nematic liquid crystals appearing as one of the most promising ones due to their controllable properties. Indeed, the application of an external electric field can tune their nonlocal response, and this mechanism may be useful for producing fluids of light and developing optical analogues. In this work, we extend the applicability of nematic liquid crystal to support optical analogues and study the possibility of emulating turbulent phenomena by using two fluids of light. These fluids interact with each other through the nonlinearity of the medium and generate instabilities that will lead to turbulent regimes. We also explore the possibility of exciting turbulent regimes through the decay of dark soliton stripes. The preliminary results are presented.

2022

Effects of Pulse Duration in Laser-induced Breakdown Spectroscopy

Authors
Ferreira, MFS; Silva, NA; Guimarães, D; Martins, RC; Jorge, PAS;

Publication
U.Porto Journal of Engineering

Abstract
Laser-induced breakdown spectroscopy (LIBS) is a technique that leverages atomic emission towards element identification and quantification. While the potential of the technology is vast, it still struggles with obstacles such as the variability of the technique. In recent years, several methods have exploited modifications to the standard implementation to work around this problem, mostly focused on the laser side to increase the signal-to-noise ratio of the emission. In this paper, we explore the effect of pulse duration on the detected signal intensity using a tunable LIBS system that consists of a versatile fiber laser, capable of emitting square-shaped pulses with a duration ranging from 10 to 100 ns. Our results show that, by tuning the duration of the pulse, it is possible to increase the signal-to-noise ratio of relevant elemental emission lines, an effect that we relate with the computed plasma temperature and associated density for the ion species. Despite the limitations of the work due to the low-resolution and small range of the spectrometer used, the preliminary results pave an interesting path towards the design of controllable LIBS systems that can be tailored to increase the signal-to-noise ratio and thus be useful for the deployment of more sensitive instruments both for qualitative and quantitative purposes.