Publications by authors named "Jerzy Lusakowski"
Spectroscopy of shallow donors is a tool to test theoretical models and to reveal properties of semiconductors. In this work we consider intra-shallow impurity transitions by studying a CdTe/(Cd, Mg)Te structure grown by a molecular beam epitaxy in which both a CdTe quantum well and (Cd, Mg)Te barries are uniformly doped with iodine donors. Measurements of a photocurrent (PC) at the far-infrared were carried out at 4.
View Article and Find Full Text PDFModulation-doped CdTe quantum wells (QWs) with CdMgTe barriers were studied by photoluminescence (PL) and far-infrared Fourier spectroscopy under a magnetic field at 4.2 K and by Raman spectroscopy at room temperature. Two samples were tested: a sample which contained ten QWs (MQW) and a sample with one QW (SQW).
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- Grating metamaterials were created using electron beam lithography on specific semiconductor structures, focusing on two sample types: etched gratings and Au stripe gratings.* -
- Testing at THz frequencies revealed that Au gratings acted as a linear polarizer, while etched gratings did not affect the polarization of THz radiation.* -
- Findings indicated that magnetoplasmons in metamaterials with etched gratings are primarily linearly polarized, suggesting the potential for in-depth research on magnetoplasmon polarization in future studies.*
We report on unidirectional and asymmetric transmission of radially polarized THz radiation through a dual circular metallic grating with sub-wavelength slits. Unidirectional transmission is shown theoretically for a super-Gaussian incident beam, and an asymmetric transmission is demonstrated experimentally, when the radially polarized beam of 0.1 THz is obtained by converting a linearly polarized beam with a discontinuous phase retarder and a tapered waveguide.
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- The study presents experimental findings on the one-way transmission of terahertz waves using two metallic gratings with varying periods.
- These gratings are designed for efficient transmission in one direction while blocking waves in the opposite direction, but achieving zero-order nonreciprocity is not possible.
- Despite this limitation, the research confirms that the setup can effectively function as an asymmetric filter.