Plasmonic terahertz detectors based on a high-electron mobility GaAs/AlGaAs heterostructure

Białek, M.; Witowski, A. M.; Орлита, М.; Potemski, M.; Czapkiewicz, M.; Wróbel, J.; Umansky, V.; Grynberg, M.; Łusakowski, J.

doi:10.1063/1.4881777

Cited by 13 publications

(15 citation statements)

References 32 publications

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“…1 which shows a PV as a function of the magnetic field in the frequency range of 200-700 GHz. At fields higher than the cyclotron resonance field B CR = 2πf m * /e (where m * = 0.070m e is the GaAs/AlGaAs heterostructure cyclotron mass, as determined from current experiment) 15…”

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confidence: 99%

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Photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance

et al. 2015

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Terahertz spectroscopy experiments at magnetic fields and low temperatures were carried out on samples of different gate shapes processed on a high electron mobility GaAs/AlGaAs heterostructure. For a given radiation frequency, multiple magnetoplasmon resonances were observed with a dispersion relation described within a local approximation of the magnetoconductivity tensor. The second harmonic of the cyclotron resonance was observed and its appearance was interpreted as resulting from a high frequency, inhomogeneous electromagnetic field on the border of a two-dimensional electron gas with a metallic gate and/or an ohmic contact. In a two-dimensional electron gas (2DEG) subject to a perpendicular magnetic field (B), electrical dipole transitions between Landau levels (LL) are restricted by the selection rule: N → N ± 1, where N = 0, 1, ... is the LL number. However, this strict selection rule was shown to be relaxed in some cases. Observations of harmonics of the cyclotron resonance (CR) were reported in a Si metal-oxide-semiconductor field-effect transistor at a sufficiently high gate polarization.1 They were explained as a result of a simultaneous action of a short-range scattering by charged traps at the Si/SiO 2 interface and the electron-electron scattering.2 Recently, Dai et al. reported on a strong response of a 2DEG at the second harmonic of the cyclotron resonance (2CR).3 The experiments were carried out at temperature (T ) between 0.3 K and 1.4 K on a GaAs/AlGaAs sample with a 2DEG mobility of 3 × 10 7 cm 2 /Vs and at radiation frequency (f ) from 60 GHz to 120 GHz. The 2CR peak was shown to be distinct from microwave-induced resistance oscillations (MIRO) 4 and disappeared at about 1.4 K. A similar observation was reported by Hatke et al. on a 2DEG in a few GaAs/AlGaAs wafers with the electron mobility of the order of 10 7 cm 2 /Vs in experiments carried out at T = 0.5 K or 1.5 K. In a series of papers 5-7 properties of a peak appearing in the photoresponse in a proximity to the 2CR were analyzed in a great detail. It was shown that the peak did not result from the MIRO and that its properties could not be explained within existing theoretical models.In the present paper we report on the observation of a photoresponse of a 2DEG at magnetic fields corresponding to the excitation of the 2CR. There are essential differences between our experiments and the experiments described in Refs. 3, 5-7. First, we investigated a 2DEG which resides in a single GaAs/AlGaAs heterostructure in comparison to modulation doped AlGaAs/GaAs/AlGaAs single quantum wells. Second, our experiments were carried out at 4.2 K and not in a mK regime. For this reason, the electron mobility in our samples was of the order of 6 × 10 5 cm 2 /Vs and not 10 7 cm 2 /Vs. This clearly indicates that the conditions of our measurements did not correspond to that of the well developed MIRO. Third, we explored both the low (120-660 GHz) and high (1.5-2.5 THz) frequency bands, which essentially enlarges the frequency range used previously, and...

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“…In the meander-gated sample, plasmons excited due to the periodicity of the gate (8 µm) are also excited, but their frequencies are much higher than these of plasmons excited due to the width. 15 Calculations based on Eqs. 1 and 2 show that only two grid-related magnetoplasmon modes could be observed in the spectral range used in the current experiment.…”

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Photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance

et al. 2015

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“…A more detailed account on magnetospectroscopy studies carried out on samples processed on this heterostructure is given in. 4,5 The measurements were carried out at 4 K by placing the sample in a center of a superconducting coil. The sample was cooled by an exchange He gas.…”

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Visible-light controlled plasma excitations in high electron mobility GaAs/AlGaAs heterostructure

et al. 2014

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Terahertz detectors based on GaAs/AlGaAs heterostructure were investigated at low temperatures and high magnetic fields. A response of detectors showed a line caused by a cyclotron resonance transition which was accompanied by several peaks originated form excitation of magnetopasmons. Illumination with a visible light caused an increase of the plasma concentration and resulted in a change of the magnetoplasmon spectrum. An analysis of spectra allowed to determine changes in the plasmon dispersion relation with a visible light which gives a tool to tune a THz response of a plasmonic detector.

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“…This makes interpretation of measured spectrum very difficult. A high quality GaAs, typically required to fabricate a CR photocurrent detector, shows a complicated response as a function of magnetic field which is caused by Shubnikov-de Haas oscillations [12]. To decrease the amplitude of these oscillations one has to increase the temperature of the detector which decreases its response at the CR.…”

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

et al. 2020

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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.

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Plasmonic terahertz detectors based on a high-electron mobility GaAs/AlGaAs heterostructure

Cited by 13 publications

References 32 publications

Photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance

Photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance

Visible-light controlled plasma excitations in high electron mobility GaAs/AlGaAs heterostructure

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

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