Effect of Epitaxial Stresses on the Time Dynamics of Photoexcited Charge Carriers in InGaAs–Based Superlattices

Buryakov, A. M.; Khusyainov, D. I.; Мишина, Е. Д.; Yachmenev, A. E.; Хабибуллин, Р. А.; Пономарев, Д. С.

doi:10.1557/adv.2019.163

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Мы применили этот подход в настоящей работе, ожидая, что за время ТГц импульса большее число " легких" фотовозбужденных носителей заряда успеет достигнуть электродов антенны. Помимо этого, гетероинтерфейсы между слоями с напряженной кристаллической решеткой также обладают повышенной шероховатостью по сравнению с гладкими гетероинтерфейсами у решеточносогласованных структур [31]. В многопериодной структуре большое количество таких гетероинтерфейсов увеличивает скорость рассеяния фотовозбужденных электронов на границах слоев, при этом подвижность в плоскости слоя остается высокой.…”

Section: образцы и методы исследованияunclassified

Фотопроводящий ТГц Детектор На Основе Новых Функциональных Слоев В Многослойных Гетероструктурах

Ячменев¹,

Лаврухин²,

Хабибуллин³

et al. 2021

Оптика И Спектроскопия

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We report on the experimental study of the photoconductive antennas (PCAs) - detectors based on superlattice heterostructures (SLS) InGaAs/InAs/InAlAs with different types of elastic stresses in their functional layers. By using our laboratory time-domain THz spectrometer we measured and compared the detected THz signals, noise characteristics, and signal-to-noise ratios of the developed bow-tie PCA-detectors at different average probe power. We showed that the SLS-based PCA-detector with elastic stresses of both compression and tension in the layers demonstrates increased THz detection bandwidth compared to that for the SLS-based PCA-detector with only compression stresses in the SLS layers in the whole range of the optical probe power. We thus demonstrate that modification of the SLS via introduction of the elastic strain in the crystalline lattice of its layers could become an efficient approach to enhance the PCA-detectors performance leading to implementation of these PCAs to the spectroscopic THz setups.

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Section: образцы и методы исследованияunclassified

Фотопроводящий ТГц Детектор На Основе Новых Функциональных Слоев В Многослойных Гетероструктурах

Ячменев¹,

Лаврухин²,

Хабибуллин³

et al. 2021

Оптика И Спектроскопия

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“…It is worth pointing out here that processes τ 1 and τ 2 in the structure with epitaxial strains are not observed. In [38], this effect is associated with a decrease of contribution of free carrier absorption and two-photon absorption to charge carriers dynamics. Here, as is evident from the relaxation curves, introduction of the epitaxial strain decreases time τ 3 .…”

Section: Formation Of Superlattice Heterostructures On the Basis Of Ingaasmentioning

confidence: 99%

“…Here, as is evident from the relaxation curves, introduction of the epitaxial strain decreases time τ 3 . First of all, it can be determined by concentration of the trapping states, resulting from epitaxial strains [38]. Finally, time τ 4 , characteristic of the carrier recombination time for the structure with epitaxial strain, demonstrates low values.…”

Section: Formation Of Superlattice Heterostructures On the Basis Of Ingaasmentioning

confidence: 99%

New Materials and Structures for Efficient Terahertz (THz) Spectroscopy

Мишина

Buryakov

Пономарев

2021

J. Commun. Technol. Electron.

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The results of developments of materials and structures used for generation and detection of terahertz radiation having applied photoconductive antennas are presented. The developments were carried out in three directions: optimization of parameters of nanoplasmonic antennas, formation of superlattice heterostructures based on InGaAs, and use of layered and two-dimensional semiconductors. The necessity and ways for further improvement in characteristics of the terahertz antennas for expanding the field of application of this radiation in spectroscopy of materials, biomedical diagnostics, metrology, spintronics, wireless communications, etc., are shown.

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“…A significant improvement in the lifetime/mobility of photoexcited charge carriers has been reported for GaAs‐based heterostructures modified by elastic stresses. [ 9–11 ] Within the framework of in‐used technologies, the improvement of spectral characteristic and signal‐to‐noise ratio (SNR) can be achieved by changing either the material characteristics (by doping with beryllium, [ 12 ] constructing metamaterials, [ 13 ] superlattice structures, [ 14 ] and nanowires, [ 15 ] changing the crystallographic orientation of the substrate [ 16 ] ) or improving the electrode design using the metasurfaces. [ 13,17,18 ]…”

Section: Introductionmentioning

confidence: 99%

Effects of Crystallographic Orientation of GaAs Substrate and the Period of Plasmon Grid on THz Antenna Performance

et al. 2021

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An alternative approach is proposed to improve the conventional (based on the low‐temperature grown GaAs and Si‐doped GaAs superlattice) photoconductive antenna (PCA) performance by modification of the planar electrodes design and crystallographic orientations of the GaAs substrate ((100) and (111)‐A). The electrode scheme design includes a combination of logarithmic spiral, bow‐tie, and plasmonic antennas and results in appearance of sharp resonant peaks, high spectral bandwidth and high signal‐to‐noise ratio, and significant enhancement of the output terahertz (THz) power. The material design leads to significant increase in the THz output power (by 6.4 in GaAs (100), by 5.6 in GaAs (111)‐A PCAs) regarding to a conventional antenna. The substrate crystallographic cut direction influences the relaxation time constant of photoexcited charge carriers being an order of magnitude smaller in the sample grown on the GaAs (111)‐A than in the one on the GaAs (100). The simulation model supports experimental results demonstrating that the optimal period of the plasmonic antenna grid providing the highest efficiency of THz radiation generation, is about 200 nm. Comparison of the THz spectra in manufactured antennas against the conventional stripline PCA shows a broadening band toward the low‐frequency region down to 0.1 THz with a resonance at 0.2 THz.

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Effect of Epitaxial Stresses on the Time Dynamics of Photoexcited Charge Carriers in InGaAs–Based Superlattices

Cited by 5 publications

References 13 publications

Фотопроводящий ТГц Детектор На Основе Новых Функциональных Слоев В Многослойных Гетероструктурах

Фотопроводящий ТГц Детектор На Основе Новых Функциональных Слоев В Многослойных Гетероструктурах

New Materials and Structures for Efficient Terahertz (THz) Spectroscopy

Effects of Crystallographic Orientation of GaAs Substrate and the Period of Plasmon Grid on THz Antenna Performance

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