scholarly journals Внутридопплеровские резонансы затухания свободной поляризации в ультратонких газовых ячейках

2021 ◽  
Vol 129 (1) ◽  
pp. 27
Author(s):  
А.Ч. Измайлов
Keyword(s):  
Molecular Spectroscopy ◽  
High Contrast ◽  
Optical Effect ◽  
Gas Cell ◽  
Ultrahigh Resolution ◽  
Frequency Standards ◽  
Stationary Radiation ◽  
Quantum Transitions ◽  
Linear Optical ◽  
Free Polarization

The linear-optical effect of the free polarization decay (FPD) in an ultrathin gas cell, the internal thickness of which is less than or of the order of the wavelength of the exciting monochromatic laser radiation, transmitted orthogonally to the plane-parallel walls of this cell, is theoretically investigated. The considered coherent FPD signal is emitted immediately after an abrupt interruption of such a relatively weak stationary radiation. Sub-Doppler resonances arising at the central frequencies of the studied quantum transitions in the spectra of the intensity and energy of the FPD as a result of the transit-time relaxation of atoms in the gas cell are established and analyzed. A significant dependence of these resonances and the dynamics of the FPD on the ratio of the inner thickness of the ultrathin cell to the wavelength of the exciting monochromatic radiation is shown. The narrow, high-contrast sub-Doppler resonances of the FPD detected and investigated in the linear-optical regime can be used in ultrahigh-resolution atomic (molecular) spectroscopy, as well as references for compact frequency standards.

scholarly journals Особенности затухания свободной поляризации в ультратонких газовых ячейках

2020 ◽  
Vol 128 (8) ◽  
pp. 1070
Author(s):  
А.Ч. Измайлов
Keyword(s):  
Laser Pulse ◽  
Transit Time ◽  
Dipole Moments ◽  
Phase Mismatch ◽  
Radiation Wavelength ◽  
Optical Effect ◽  
Gas Cell ◽  
A Cell ◽  
Atomic Dipole ◽  
Free Polarization

Optical effect of the free polarization decay is studied theoretically in the ultrathin gas cell whose inner thickness is less or order of the wavelength of exciting monochromatic laser pulse transmitted orthogonally to plane-parallel walls of the cell. New mechanism of the investigated effect is established which is caused by specifics of phase mismatch of light induced atomic dipole moments because of transit-time relaxation in such a cell. As a result, dynamics of the free polarization decay in the considered situation radically different from the known case in a usual (macroscopic) gas cell. Nontrivial oscillatory dependences of signals of the free polarization decay on the ratio of thickness of such a cell to the radiation wavelength of the exciting pulse have been discovered and analyzed.

Non-Linear Optical Effect

2016 ◽  
Author(s):  
S. E. Braslavsky ◽  
K. N. Houk
Keyword(s):  
Optical Effect ◽  
Non Linear ◽  
Linear Optical

scholarly journals High-contrast and reversible scattering switching via hybrid metal-dielectric metasurfaces

2018 ◽  
Vol 9 ◽  
pp. 460-467 ◽  
Author(s):  
Jonathan Ward ◽  
Khosro Zangeneh Kamali ◽  
Lei Xu ◽  
Guoquan Zhang ◽  
Andrey E Miroshnichenko ◽  
...  
Keyword(s):  
Chemical Sensing ◽  
Slow Light ◽  
Direct Influence ◽  
High Contrast ◽  
Optical Effect ◽  
Third Harmonic ◽  
Nonlinear Properties ◽  
Wide Range ◽  
Intermediate Distance ◽  
Versatile Tool

Novel types of optical hybrid metasurfaces consist of metallic and dielectric elements are designed and proposed for controlling the interference between magnetic and electric modes of the system, in a reversible manner. By employing the thermo-optical effect of silicon and gold nanoantennas we demonstrate an active control on the excitation and interference between electric and magnetic modes, and subsequently, the Kerker condition, as a directive radiation pattern with zero backscattering, via temperature control as a versatile tool. This control allows precise tuning optical properties of the system and stimulating switchable sharp spectral Fano-like resonance. Furthermore, it is shown that by adjusting the intermediate distance between metallic and dielectric elements, opposite scattering directionalities are achievable in an arbitrary wavelength. Interestingly, this effect is shown to have a direct influence on nonlinear properties, too, where 10-fold enhancement in the intensity of third harmonic light can be obtained for this system, via heating. This hybrid metasurface can find a wide range of applications in slow light, nonlinear optics and bio-chemical sensing.

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