A Photoconductive THz Detector Based on a Superlattice Heterostructure with Plasmonic Amplification

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

doi:10.1134/s1063785020110218

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…In recent years, nanoplasmonic structures [15] implemented into the gap of PCAs, give the opportunity to redistribute the energy of the laser pumping pulse so that most photocarriers are placed near plasmonic electrodes of the antenna, were brought to active use. A similar structure gives the opportunity to significantly increase effectiveness of conversion in PCAs and increase the power of generation of THz radiation [18]. Note that PCAs are not unique generators and detectors of THz pulses.…”

Section: Microwave Electronicsmentioning

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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Section: Microwave Electronicsmentioning

confidence: 99%

New Materials and Structures for Efficient Terahertz (THz) Spectroscopy

Мишина

Buryakov

Пономарев

2021

J. Commun. Technol. Electron.

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“…[ 25 ] In recent studies, the significant improvement in PCA performance has been achieved through nanoplasmonic technologies via the application of nanoscale grid, which was shown to increase the effective optical field in the photoabsorbing layer drastically. [ 17,26 ] However, a sharp look to insight the explicit effect of plasmon grid and especially the period of a nanoscale grid on the THz radiation efficiency, spectral width, sensitivity, and SNR remains undiscovered properly. In the current work, we aim to cover this gap in relation to the crystallographic orientation of the GaAs substrate and the period of the plasmon grid, thereby paving the way for significant improvements in PCAs performance.…”

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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“…Despite the technology evolution and advantages of narrow−band materials [5,6], the PCA emitter based on them exhibits the efficiency of laser pump pulse conversion into THz electromagnetic oscillations [7,8] of no more than ∼ 1%; this makes it necessary to continue searching for new design solutions.…”

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Laser pulse energy localization in a photoconductive THz emitter via sapphire fibers

Пономарев

Lavrukhin

Zenchenko

et al. 2022

Technical Physics Letters

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We report a seminal approach for localization of photocarriers in a photoconductive antenna (PCA)-emitter via a focusing element comprising the sapphire fiber. Using numerical simulation, we showed that at a certain ratio between the fiber diameter and antenna gap size (d/g~ 22.5), one can attain a ~ 35-fold enhancement of laser irradiation in the vicinity of the PCA electrodes. This provides the formation of subwavelength electromagnetic wave caustics located at the edges of the PCA electrodes, which potentially promotes an increase in the optical-to-terahertz conversion efficiency. Keywords: terahertz frequency, terahertz emitters, semiconductors, photoconductive antenna, IR radiation.

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A Photoconductive THz Detector Based on a Superlattice Heterostructure with Plasmonic Amplification

Cited by 9 publications

References 18 publications

New Materials and Structures for Efficient Terahertz (THz) Spectroscopy

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

Laser pulse energy localization in a photoconductive THz emitter via sapphire fibers

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