Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells as Terahertz Detectors for High Magnetic Field Applications

The cyclotron and magnetoplasmon resonances were studied at 2 K in grating metamaterials fabricated on wafers with one or two modulation doped CdTe/CdMgTe quantum wells. The gratings (with the period varied between 2 μ m and 8 μ m) were prepared with an electron beam lithography either by etching or...

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Bibliographic Details
Published in:Applied sciences 2020-04, Vol.10 (8), p.2807
Main Authors: Yavorskiy, Dmitriy, Szoła, Maria, Karpierz, Krzysztof, Bożek, Rafał, Rudniewski, Rafał, Karczewski, Grzegorz, Wojtowicz, Tomasz, Wróbel, Jerzy, Łusakowski, Jerzy
Format: Article
Language:English
Subjects:
Atomic force microscopes
Atomic force microscopy
Cadmium telluride
CdTe/CdMgTe quantum wells
Cyclotron resonance
Electron beam lithography
Etching
Evaporation
Gamma rays
Grooves
Magnetic fields
magnetoplasmons
Metamaterials
Physics
Quantum dots
Quantum wells
Sensors
Spectrum analysis
THz spectroscopy
White light
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Summary:The cyclotron and magnetoplasmon resonances were studied at 2 K in grating metamaterials fabricated on wafers with one or two modulation doped CdTe/CdMgTe quantum wells. The gratings (with the period varied between 2 μ m and 8 μ m) were prepared with an electron beam lithography either by etching or by evaporation of Au. The gratings were studied with an atomic force microscope which revealed a correlation between the depth and width of etched grooves at a constant time of etching. The sharpest resonances observed are due to excitation of magnetoplasmon in the case of Au gratings on a wafer with one quantum well. Etched samples with two quantum wells showed the strongest tuneability of magnetoplasmon resonances with the period of the grating and illumination with white light. We showed that the samples studied can be used as resonant or quasi-resonant terahertz detectors tuneable with magnetic field and white light.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10082807