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1
Content available Terahertz response of CdTe/Cd1-xMgxTe modulation-doped multiple quantum wells
Łusakowski Jerzy, Frączak Andrzej, Grymuza Mikołaj, Imos Eryk, Siemaszko Adam, Solarska Wiktoria, Woyciechowska Aniela, Zaremba Maciej, Zdunek Rafał, Karpierz Krzysztof, Adamus Zbigniew, Słupiński Tomasz, Wojtowicz Tomasz
Opto-Electronics Review
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2023
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Vol. 31, No. 2
art. no. e144600
EN
Terahertz (THz) transmission, photoresistance, and electrical conductivity experiments were carried out at 4.2 K on a sample with modulation-doped CdTe/Cd₁₋ₓMgₓTe 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 𝐵ˉ¹. 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 cmˉ². 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.
2
Content available Terahertz dielectric characterisation of fibres in a time-domain spectrometer
Pacewicz Adam, Kopyt Paweł, Cuper Jerzy, Krysicki Mateusz, Salski Bartłomiej
Opto-Electronics Review
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2023
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Vol. 31, No. 2
art. no. e144596
EN
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.
3
Content available Magnetospectroscopy of CdTe/Cd₁-xMgxTe modulation-doped quantum wells in THz and visible range
Łusakowski Jerzy, Zaremba Maciej, Siemaszko Adam, Karpierz Krzysztof, Adamus Zbigniew, Wojtowicz Tomasz
Opto-Electronics Review
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2023
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Vol. 31, No. 2
art. no. e144597
EN
Transport, photoluminescence, THz transmission, and optically detected cyclotron resonance studies were carried out on samples with a single modulation-doped CdTe/Cd₁₋ₓMgₓTe 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)m₀. Observed photoluminescence and optically detected cyclotron resonance spectra cannot be explained within the simple model of Landau quantization of parabolic bands.
4
Content available remote SU-8 based planar metamaterials with fourfold symmetry as selective terahertz absorbers
Grześkiewicz B., Sierakowski A., Marczewski J., Pałka N., Wolarz E.
Opto-Electronics Review
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2018
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Vol. 26, No. 4
329--337
EN
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 fabri-cation time. The experimental absorption of the metamaterial absorbers has narrowband characteristics that were consistent with the numerical simulations. Power flow analysis in the transmissive metama-terial unit cell shows that the absorption in the terahertz range occurs primarily in the SU-8 layer of the absorber.
5
Content available Design of multichannel readout system for spectral identification of materials
Kołaciński C., Obrębski D., Zbieć M., Zagrajek P.
International Journal of Microelectronics and Computer Science
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2015
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Vol. 6, nr 2
35--42
EN
This paper addresses the work performed on development of the readout circuits for FET-based THz detectors. Ultimately, designed readout system is intended to work within the material identification equipment, which targeted to perform the spectral recognition of samples. At the beginning, the short introduction of the THz detection basics and main applications of the THz spectroscopy are presented. Next, the preceding work on single-channel readout circuit is shortly recalled, with a special emphasis on the last design version featuring selective chopper amplifier. This IC became the basis of the complete readout system addressed in next few sections of this paper. Finally, design of novel integrated circuit is presented, incorporating the multichannel readout circuit dedicated for pixel line.
6
Content available Selected nonapeptides in terahertz light
Fuglewicz B., Pliński E. F., Jarząb P. P., Plińska S., Cebrat M., Nowak K., Augustyn L., Walczakowski M. J., Mikulics M., Pałka N., Szustakowski M.
Optica Applicata
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2014
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Vol. 44, nr 1
159--171
EN
Eight synthetic histidine analogues of oxytocin and vasopressin are subject of investigations. The spectra of the peptides have been investigated in the terahertz band. The results are obtained in the terahertz time-domain spectroscopy arrangement.
7
Content available remote Selected polymers on CW and pulsed THz investigations
Jarzab P. P., Nowak K., Walczakowski M. J., Augustyn L., Mikulics M., Wilk R., Witkowski J. S., Plinski E. F.
Opto-Electronics Review
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2012
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Vol. 20, No. 4
335-339
EN
The paper gives the results of refractive indexes for three plastic materials: polyethylene, polymethyl methacrylate and polyvinyl chloride, which are measured and compared in two arrangements - a CW THz photomixer and a pulsed THz spectrometer.
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