Design of a Reconfigurable THz Filter Based on Metamaterial Wire Resonators with Applications on Sensor Devices
1
Department of Information Science and Technology, ISCTE—Instituto Universitário de Lisboa, Av. das Forças Armadas, 1649-026 Lisbon, Portugal
2
Radio Systems Group, Instituto de Telecomunicações, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Photonics 2020, 7(3), 48; https://doi.org/10.3390/photonics7030048
Received: 31 May 2020 / Revised: 1 July 2020 / Accepted: 7 July 2020 / Published: 10 July 2020
(This article belongs to the Special Issue Metamaterials for Advanced Photonic and Plasmonic Applications – Selected Papers from Metamaterials’2019)
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.
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Keywords:
filters; metamaterials; frequency-selective surfaces (FSSs); stress sensors; terahertz (THz)
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MDPI and ACS Style
Pavia, J.P.; Souto, N.; Ribeiro, M.A. Design of a Reconfigurable THz Filter Based on Metamaterial Wire Resonators with Applications on Sensor Devices. Photonics 2020, 7, 48. https://doi.org/10.3390/photonics7030048
AMA Style
Pavia JP, Souto N, Ribeiro MA. Design of a Reconfigurable THz Filter Based on Metamaterial Wire Resonators with Applications on Sensor Devices. Photonics. 2020; 7(3):48. https://doi.org/10.3390/photonics7030048
Chicago/Turabian StylePavia, João P.; Souto, Nuno; Ribeiro, Marco A. 2020. "Design of a Reconfigurable THz Filter Based on Metamaterial Wire Resonators with Applications on Sensor Devices" Photonics 7, no. 3: 48. https://doi.org/10.3390/photonics7030048
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