Emission of terahertz pulses from vanadium dioxide films undergoing metal–insulator phase transition

Esaulkov, Mikhail N.; Solyankin, P. M.; Sidorov, Artem; Parshina, L. S.; Makarevich, A. M.; Jin, Qi; Luo, Qin; Novodvorsky, O. A.; Kaul, A.R.; Cherepetskaya, Elena B.; Shkurinov, A. P.; Makarov, Vladimir; Zhang, Xicheng

doi:10.1364/optica.2.000790

Cited by 23 publications

(16 citation statements)

References 34 publications

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“…The large E b values signify that the low‐temperature VO 2 conceives Frenkel excitons since such excitons have a typical binding energy of the order of 0.1 to 1.0 eV. Our result may be in agreement with others in that the nonlinear response is generally influenced by optically induced conductivity, and that the interaction of fundamental radiation with the low‐temperature phase of the VO 2 leads to generation of the Frenkel exciton that decays rapidly into a Wannier–Mott exciton [81–82] …”

Section: Resultssupporting

confidence: 88%

Geometrical‐, Electronic‐ and Optical Properties of Vanadium Dioxide: A Theoretical Perspective from Meta‐GGA SCAN

Varadwaj

Miyake

2022

ChemistrySelect

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Meta‐GGA (SCAN, and SCAN‐rVV10) density functionals were used to determine the lattice constants, cell‐volume and ‐density, phase‐stability, bandgaps and dielectric functions of experimentally recognized non‐magnetic VO2 in the monoclinic (M1) and rutile (R) phases. Our results suggest that these functionals can adequately predict the most important geometrical and optoelectronic properties of VO2 that are not only in excellent agreement with experiment but also better than those reported using GGA and GGA+U. In specific, we have shown that SCAN‐rVV10 correctly predicts the preferential energy stability of low‐temperature monoclinic phase over the high‐temperature rutile phase of VO2, in agreement with the experimental latent heat of phase transition between the two phases (44.45 meV). A bandgap of approximately 0.58 eV for VO2(M1) was obtained with the two meta‐GGA functionals, which is also consistent with experiment (0.6–0.7 eV). Although the meta‐GGA predicted absorption peaks of the imaginary part of the dielectric function in the near infrared region has displayed reasonable match with experiment, it overestimated the absorption peaks in the visible region. Our results suggest that the degree of exchange and electron‐electron correlation incorporated in meta‐GGA SCAN, and its van der Waals analogue, SCAN‐rVV10, is appropriate in reproducing the experimentally observed V–V chain features that are linked with the insulator‐to‐metal phase transition. The optical dielectric features computed with GGA and meta‐GGA were compared with many‐body theory (at the G0W0 (RPA) and G0W0‐BSE level(s)) and discussed.

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Section: Resultssupporting

confidence: 88%

Geometrical‐, Electronic‐ and Optical Properties of Vanadium Dioxide: A Theoretical Perspective from Meta‐GGA SCAN

Varadwaj

Miyake

2022

ChemistrySelect

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“…8 It is also different than nonlinear optical techniques for THz generation including the recently reported THz emission from VO 2 . 20 The photoconductive switching mechanism is employed in the present device as follows: a DC bias voltage charges the feed structure to an initial voltage (V o ) while the VO 2 layer is in a highly resistive, semiconductor state. The laser pulse subsequently drives the VO 2 layer into the conductive metallic state in a few hundred femtoseconds.…”

Section: Resultsmentioning

confidence: 99%

Broadband terahertz generation using the semiconductor-metal transition in VO2

et al. 2016

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We report the design, fabrication, and characterization of broadband terahertz emitters based on the semiconductor-metal transition in thin film VO2 (vanadium dioxide). With the appropriate geometry, picosecond electrical pulses are generated by illuminating 120 nm thick VO2 with 280 fs pulses from a femtosecond laser. These ultrafast electrical pulses are used to drive a simple dipole antenna, generating broadband terahertz radiation.

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“…There are highly efficient methods of terahertz generation, for example, via optical rectification in crystals, which are limited by the destruction of the material with increase in the pump energy above the damage threshold [7][8][9]. It is worth noting the new variety of materials on the basis of which the efficient sources of terahertz radiation are being created [10,11]. The most popular mechanism is terahertz generation via filamentation in gases with one or two-color optical excitation due to the possibility to control output radiation by the pump laser parameters [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Flat liquid jet as a highly efficient source of terahertz radiation

Tcypkin¹,

Ponomareva²,

Putilin³

et al. 2019

Opt. Express

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Polar liquids are strong absorbers of electromagnetic waves in the terahertz range, therefore, historically such liquids have not been considered as good candidates for terahertz sources. However, flowing liquid medium has explicit advantages, such as a higher damage threshold compared to solid-state sources and more efficient ionization process compared to gases. Here we report systematic study of efficient generation of terahertz radiation in flat liquid jets under sub-picosecond single-color optical excitation. We demonstrate how medium parameters such as molecular density, ionization energy and linear absorption contribute to the terahertz emission from the flat liquid jets. Our simulation and experimental measurements reveal that the terahertz energy has quasi-quadratic dependence on the optical excitation pulse energy. Moreover, the optimal pump pulse duration, which depends on the thickness of the jet is theoretically predicted and experimentally confirmed. The obtained optical-to-terahertz energy conversion efficiency is more than 0.05%. It is comparable to the commonly used optical rectification in most of electro-optical crystals and two-color air filamentation. These results, significantly advancing prior research, can be successfully applied to create a new alternative source of terahertz radiation.

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Emission of terahertz pulses from vanadium dioxide films undergoing metal–insulator phase transition

Cited by 23 publications

References 34 publications

Geometrical‐, Electronic‐ and Optical Properties of Vanadium Dioxide: A Theoretical Perspective from Meta‐GGA SCAN

Geometrical‐, Electronic‐ and Optical Properties of Vanadium Dioxide: A Theoretical Perspective from Meta‐GGA SCAN

Broadband terahertz generation using the semiconductor-metal transition in VO2

Flat liquid jet as a highly efficient source of terahertz radiation

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