Complex extraordinary dielectric function of Mg-doped lithium niobate crystals at terahertz frequencies

Кузнецов, К. А.; Китаева, Г. Х.; Kovalev, Sergey; Germansky, S. A.; Buryakov, A. M.; Tuchak, A. N.; Penin, A. N.

doi:10.1007/s00340-016-6498-5

Cited by 20 publications

(10 citation statements)

References 26 publications

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“…is neglected in the expression for the biphoton amplitude (9), and the sinc function is approximated by a Gaussian function, then the decomposition of the function in (10) into Schmidt modes can be performed analytically [22,23]. This approximation is acceptable if the frequencies of the signal and idler radiation are comparable and the angular width of the phase matching is sufficiently small.…”

Section:  mentioning

confidence: 99%

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Azimuthal eigenmodes at strongly non-degenerate parametric down-conversion

Dvernik

Prudkovskii

2021

Appl. Phys. B

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Quantum-optical technologies based on the effect of parametric light downconversion are not yet applied in the terahertz frequency range. This is owing to the absence of terahertz single-photon detectors and the strong entanglement of modes of optical-terahertz biphotons. This study investigates the angular structure of scattered radiation generated by strongly non-degenerate parametric down-conversion. It demonstrates that under certain approximations, it is possible to obtain azimuthal eigenmodes for the nonlinear-interaction operator. The solution of the evolution equations for the field operators in these eigenmodes has the form of the Bogolyubov transformation, which allows a scattering matrix to be obtained for arbitrary values of the parametric gain. This scattering matrix can describe both the production of biphoton pairs and the generation of intense fluxes of correlated optical-terahertz fields that form a macroscopic quantum state of radiation in two spectral ranges.

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Section:  mentioning

confidence: 99%

“…Over the past 10 years, the possibilities of generating and detecting terahertz radiation using strongly non-degenerate PDC have been actively studied [7]. This has already enabled the development of both methods for terahertz spectroscopy [8][9][10][11][12] and methods for measuring the brightness of terahertz radiation [13][14][15].…”

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confidence: 99%

Azimuthal eigenmodes at strongly non-degenerate parametric down-conversion

Dvernik

Prudkovskii

2021

Appl. Phys. B

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“…However, up to now all the experimental progress within this direction is concerned with detection of optical signal radiation which is correlated with its THz idler counterpart. It takes place in sensing/spectroscopy applications of quantum-correlated optical-terahertz biphotons generated under spontaneous parametric down-conversion (PDC) [ 6 , 8 , 9 , 11 , 21 ], and in studying the vacuum fluctuations at THz frequencies by means of electro-optic sampling [ 2 , 7 ]. One of the limiting reasons is the great difficulty in creating THz receivers that can operate in the single-photon detection mode [ 22 , 23 , 24 , 25 ] and potentially allow the use of high-speed coincidence schemes.…”

Section: Introductionmentioning

confidence: 99%

Towards Measuring Terahertz Photon Statistics by a Superconducting Bolometer

Prudkovskii

Leontyev

Кузнецов

et al. 2021

Sensors

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Statistical distributions of the analog readings of an antenna-coupled THz superconducting bolometer were measured and analyzed under a special type of irradiation by low-energy fluxes of THz photons with Poisson photon statistics and controllable mean photon numbers. The photons were generated via low-gain parametric down-conversion in pulse-pumped Mg:LiNbO3 crystal placed to a cooled cryostat together with the bolometer NbN film. Results of theoretical approximation of experimental histograms reveal the discrete nature of THz detection by superconducting bolometers and open a way for studying their quantum characteristics. It is shown that bolometer readings per pulse consist of discrete counts (“single charges”), with the mean number linearly dependent on the number of input photons. Contributions of single counts to a total analog reading are statistically distributed according to the normal law, with average values slightly depending on the number of counts in each reading. A general formula is proposed to describe the relationship between continuous statistical distribution of the bolometer readings and discrete quantum statistics of the incident photons.

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“…Earlier a special approach was applied for measuring of the dielectric function imaginary part at THz frequencies, based on the analysis of visibility of three-wave interference under spontaneous parametric down-conversion (SPDC) in the Young scheme [6]. The experiments were performed using SPDC-based three-wave interferometric technique in geometry of near-forward Raman scattering by phonon polaritons.…”

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confidence: 99%