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SU-8 based planar metamaterials with fourfold symmetry as selective terahertz absorbers

B. Grześkiewicz A. Sierakowski J. Marczewski N. Pałka E. Wolarz
Opto-Electronics Review | 2018 | vol. 26 | No 4 | 329-337
Keywords Terahertz metamaterial absorber Terahertz spectroscopy Transmittance Reflectance
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Abstract

We report on the absorption properties of polarization-insensitive transmissive and reflective metamaterial absorbers based on two planar aluminium periodic structures and SU-8 epoxy resist. These absorbers were investigated using numerical simulation and experimental methods in the terahertz range (below 2 THz). SU-8 is a very promising organic material for dielectric layers in planar metamaterials, because its application simplifies the process of fabricating these structures and significantly reduces the fabrication time. The experimental absorption of the metamaterial absorbers has narrowband characteristics that were consistent with the numerical simulations. Power flow analysis in the transmissive metamaterial unit cell shows that the absorption in the terahertz range occurs primarily in the SU-8 layer of the absorber.

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Authors and Affiliations

B. Grześkiewicz
A. Sierakowski
J. Marczewski
N. Pałka
E. Wolarz

Terahertz dielectric characterisation of fibres in a time-domain spectrometer

Adam Pacewicz Paweł Kopyt Jerzy Cuper Mateusz Krysicki Bartłomiej Salski
Opto-Electronics Review | 2023 | 31 | 2 | e144596 | DOI: 10.24425/opelre.2023.144596
Keywords terahertz spectroscopy fibre characterisation dielectric materials
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Abstract

An innovative measurement setup for the dielectric characterisation of fibres in a terahertz time-domain spectrometer using an HDPE elliptical lens for coupling into the fibres has been built and validated by measurements of several different types of samples. The setup is based on a commercial all fibre-coupled terahertz time-domain spectrometer. Measurements of the effective refractive index have been conducted on polypropylene-based three-dimensional printing filaments, silica glass rods, and a polytetrafluoroethylene cord of lowered density, covering the frequency range of approximately 100 GHz to 1 THz. The theoretical part of the work includes numerical calculations performed via the finite difference eigenmode method and the characteristic equations of a uniform circular dielectric waveguide for a few guided modes, from which it is clear that primarily the fundamental mode propagates along the fibre. Details on model-based phase corrections, crucial to the accurate determination of the effective refractive index of dispersive fibres, have been presented as well.
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Authors and Affiliations

Adam Pacewicz
1
ORCID: ORCID
Paweł Kopyt
1
ORCID: ORCID
Jerzy Cuper
1
ORCID: ORCID
Mateusz Krysicki
1
ORCID: ORCID
Bartłomiej Salski
1
ORCID: ORCID
  1. Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland

Magnetospectroscopy of CdTe/Cd 1-xMg xTe modulation-doped quantum wells in THz and visible range

Jerzy Łusakowski Maciej Zaremba Adam Siemaszko Krzysztof Karpierz Zbigniew Adamus Tomasz Wojtowicz
Opto-Electronics Review | 2023 | 31 | 2 | e144597 | DOI: 10.24425/opelre.2023.144597
Keywords terahertz spectroscopy optically detected cyclotron resonance modulation-doped CdTe quantum wells
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Abstract

Transport, photoluminescence, THz transmission, and optically detected cyclotron resonance studies were carried out on samples with a single modulation-doped CdTe/Cd 1-xMg xTe quantum well. THz experiments were performed at liquid helium temperatures for photon energies between about 0.5 meV and 3.5 meV. An effective mass of electron was determined to be (0.1020±0.0003)m 0. Observed photoluminescence and optically detected cyclotron resonance spectra cannot be explained within the simple model of Landau quantization of parabolic bands.
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Authors and Affiliations

Jerzy Łusakowski
1
ORCID: ORCID
Maciej Zaremba
1
Adam Siemaszko
1
Krzysztof Karpierz
1
Zbigniew Adamus
2 3
ORCID: ORCID
Tomasz Wojtowicz
4
ORCID: ORCID
  1. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  2. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  3. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  4. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland

Terahertz response of CdTe/Cd 1-xMg xTe modulation-doped multiple quantum wells

Jerzy Łusakowski Andrzej Frączak Mikołaj Grymuza Eryk Imos Adam Siemaszko Wiktoria Solarska Aniela Woyciechowska Maciej Zaremba Rafał Zdunek Krzysztof Karpierz Zbigniew Adamus Tomasz Słupiński Tomasz Wojtowicz
Opto-Electronics Review | 2023 | 31 | 2 | e144600 | DOI: 10.24425/opelre.2023.144600
Keywords terahertz spectroscopy Shubnikov-de Haas oscillations modulation-doped multiple CdTe-based quantum wells
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Abstract

Terahertz (THz) transmission, photoresistance, and electrical conductivity experiments were carried out at 4.2 K on a sample with modulation-doped CdTe/Cd 1-xMg xTe multiple quantum wells. The measurements were carried out as a function of a magnetic field B up to 9 T and a radiation frequency between 0.1 and 0.66 THz. A broad minimum in the transmission curve was observed at magnetic fields corresponding to the cyclotron resonance at given THz frequency which was followed at larger fields by an oscillatory signal, periodic in B −1. Shubnikov-de Haas oscillations were observed in magnetoconductivity and in photoresistance. Each of these experimental signals revealed the same electron concentration equal to (1.01 ± 0.03) ∙1012 cm −2. THz spectroscopy results are compared with data obtained on a single quantum well and are discussed from the point of view of using such multiple quantum wells as THz optical elements.
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Authors and Affiliations

Jerzy Łusakowski
1 2
ORCID: ORCID
Andrzej Frączak
1
Mikołaj Grymuza
1
Eryk Imos
1
Adam Siemaszko
1
Wiktoria Solarska
1
Aniela Woyciechowska
1
Maciej Zaremba
1
Rafał Zdunek
1
Krzysztof Karpierz
1
Zbigniew Adamus
3 4
ORCID: ORCID
Tomasz Słupiński
3 4
ORCID: ORCID
Tomasz Wojtowicz
3
ORCID: ORCID
  1. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
  2. CENTERA Laboratories, Institute of High-Pressure Physics, Polish Academy of Sciences, Sokołowska 29, 01-142 Warsaw, Poland
  3. International Research Centre Mag Top, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  4. Institute of Physics,Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland

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