Artigo em revista científica Q2
Design of a reconfigurable THz filter based on metamaterial wire resonators with applications on sensor devices
João Pedro Pavia (Pavia, J. P.); Nuno Souto (Souto, N.); Marco Ribeiro (Ribeiro, M.);
Título Revista
Photonics
Ano (publicação definitiva)
2020
Língua
Inglês
País
Suíça
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Abstract/Resumo
A study on the design, simulation and characterization of a reconfigurable terahertz (THz) filter, composed of two frequency-selective surfaces (FSSs) with applications on sensor devices in general and highly sensitive stress sensors, is presented in this paper. Using the developed theoretical model, we found out that by careful tuning the wire parameters, it is possible to control the filter sensitivity and also the energy transmission and reflection that passes through the structure. Numerical modelling of both the mechanical and electromagnetic components (using the elasticity equation and Maxwell’s equations, respectively) has been undertaken for two types of the device assemblies based on different thermoplastic polymers transparent to the THz radiation, namely: high-density polyethylene (HDPE) and polytetrafluoroethylene (PTFE), operating in a THz window from 395 to 455 GHz. The numerical results allowed us to characterize the relation between the reflectance/transmittance and the amount of force required to obtain a specific frequency shift along that window. It was found that the device assembled with HDPE presents a more linear response and it is able to pass from a full transparency to almost full opacity using only its linear operating zone. Due to its characteristics, this THz filter might be an interesting solution not only for THz sensors based on reconfigurable filters but also for optical modulators for the THz domain.
Agradecimentos/Acknowledgements
TUBITAK/0002/2014, UIDB/EEA/50008/2020 and ISTA-BM-PDCTI-2019
Palavras-chave
Metamaterials,Frequency-selective surfaces (FSSs),Stress sensors,Terahertz (THz)
  • Ciências Físicas - Ciências Naturais
  • Engenharia Eletrotécnica, Eletrónica e Informática - Engenharia e Tecnologia
  • Engenharia dos Materiais - Engenharia e Tecnologia
Registos de financiamentos
Referência de financiamento Entidade Financiadora
TUBITAK/0002/2014 Fundação para a Ciência e a Tecnologia
ISTA-BM-PDCTI-2019 Iscte-Instituto Universitário de Lisboa
UIDB/EEA/50008/2020 Fundação para a Ciência e a Tecnologia