Terahertz Photoconductive Antenna Based on a Topological Insulator Nanofilm

Кузнецов, К. А.; Safronenkov, D. A.; Кузнецов, П. И.; Китаева, Г. Х.

doi:10.3390/app11125580

Cited by 10 publications

(5 citation statements)

References 42 publications

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“…THz spectral range 0.1 − 30 THz (3 mm -10 𝜇m in wavelength) has fundamental importance for material science due to characteristic lattice vibrations of phonon modes. Among established semiconductor-based THz emitters/receivers working on photo-activated optically gated currents (Auston switch), a new emerging direction is using nano-thin topological insulators [8]. Another emerging direction is the use of dielectric breakdown as a tool to create short-lived (∼ 1 ps) and micro-localised (sub-wavelength at THz frequencies) currents for THz emission [9].…”

Section: Fine 3d Control Of Thz Emission In Air With Dual Femtosecond...mentioning

confidence: 99%

Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime

Huang,

Nagashima,

Kumagai

et al. 2024

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Emission of THz radiation from air breakdown at focused ultra-short fs-laser pulses (800 nm/35 fs) was investigated for the 3D spatio-temporal control where two pre-pulses are used before the main-pulse. The laser pulse induced air breakdown forms a ∼ 120 𝜇m-long focal volume generate shockwaves which deliver a denser air into the focal region of the main pulse for enhanced generation of THz radiation at 0.1-2.5 THz spectral window. The intensity of pre-and main-pulses was at the tunnelling ionisation intensities (1 − 3) × 10 16 W/cm 2 and corresponded to sub-critical (transparent) plasma formation in air. Polarisation analysis of THz radiation revealed that orientation of the air density gradients generated by pre-pulses and their time-position locations defined the ellipticity of the generated THz electrical field. The rotational component of electric current is the origin of THz radiation.

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Section: Fine 3d Control Of Thz Emission In Air With Dual Femtosecond...mentioning

confidence: 99%

Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime

Huang,

Nagashima,

Kumagai

et al. 2024

gxjzz

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“…Furthermore, 2D-TIs alloys: binary, ternary, and quaternary with a specific composition have been investigated in many studies [65,66]. For example, Kuznetsov et al studied the THz emission proprieties of the Bi 2-x Sb x Te 3-y Se y (BSTS) topological insulators films grown by the MOCVD method on a sapphire substrate, with different thicknesses and chemical compositions [65].…”

Section: Topological Insulatormentioning

confidence: 99%

Two-Dimensional Materials for Terahertz Emission

Alharbi¹,

Alshamrani²,

Hussain³

et al. 2023

Trends in Terahertz Technology

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The demand for ultrahigh-speed, lightweight, low-cost, and defect-tolerant electronic devices drives the industry to switch to terahertz (THz) technologies. The use of two-dimensional (2D) materials has massively increased in THz applications due to their appealing electronic and optoelectronic properties, including tunable bandgap, high carrier mobility, wideband optical absorption, and relatively short carrier lifetime. Several 2D-material-based emitters, modulators, and detectors have been fabricated and examined. In this context, considerable research has been going on for 2D-material-based THz emitting sources, including materials and device structure to understand the electronics and optoelectronics mechanisms occurring in the THz region. This chapter focuses on the 2D-material-based emitters with insights into the background, the physical principle of photoconductive THz emitters, the 2D materials’ properties, and the research trends in the fabrication and characterization of the THz sources based upon 2D materials.

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“…THz spectral range 0.1 − 30 THz (3 mm -10 µm in wavelength) has fundamental importance for material science due to characteristic lattice vibrations of phonon modes. Among established semiconductor-based THz emitters/receivers working on photo-activated optically gated currents (Auston switch), a new emerging direction is using nano-thin topological insulators [8]. Another emerging direction is the use of dielectric breakdown as a tool to create short-lived (∼ 1 ps) and micro-localized (sub-wavelength at THz frequencies) currents for THz emission [9].…”

Section: Of 23mentioning

confidence: 99%

Fine 3D Control of THz Emission in Air with Dual Femtosecond Laser Pre-pulses at Tunnelling Ionisation Regime

Huang,

Nagashima,

Kumagai

et al. 2023

Preprint

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Two pre-pulses focused at different positions and at different time moments were used to enhance THz emission generated by the main pulse. The emission of THz radiation from air breakdown regions of focused ultrashort fs-laser pulses (800 nm/35 fs) at shockwave front prepared by pre-pulses was investigated, and a 3D spatio-temporal control was established for the most intense emission. The laser pulse-induced air breakdown forms a ~120 micrometers-long focal volume and generates a shockwave that delivers denser air into the focal region of the main pulse for enhanced generation of THz radiation at 0.1-2.5 THz spectral window. The intensity of pre- and main-pulses was at the tunneling ionisation intensities (1-3)x1016 W/cm2 and corresponded to sub-critical (transparent) plasma in air. Polarisation analysis revealed that the orientation of the air density gradients generated by pre-pulses and their time-space placement defined the ellipticity of the generated THz electrical field. The rotational electric current is the origin of THz radiation. The current is created by non-parallel gradients of electron density and temperature. Scaling dependencies of THz emission control are established.

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Terahertz Photoconductive Antenna Based on a Topological Insulator Nanofilm

Cited by 10 publications

References 42 publications

Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime

Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime

Two-Dimensional Materials for Terahertz Emission

Fine 3D Control of THz Emission in Air with Dual Femtosecond Laser Pre-pulses at Tunnelling Ionisation Regime

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