Light absorption by interacting atomic gas in quantum optical regime

Sizhuk, Andrii S. and Dorfman, Konstantin and Ooi, Chong Heng Raymond (2021) Light absorption by interacting atomic gas in quantum optical regime. The Journal of Chemical Physics, 155 (4). ISSN 0021-9606, DOI

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Quantum optical theory of absorption properties of interacting atoms is developed. The concept of local absorptance is introduced as a derivative of the logarithm of intensity with respect to the distance in the vicinity of a given spatial point and a moment of time. The intensity is represented by the quantum and statistically averaged normal product of creation and annihilation operators of the electromagnetic field. The development of an analytical method of the estimation for the kinetic and optical parameters for the system is proposed here. The calculation method of the absorption coefficient includes thermal atomic motion, Doppler effect, and the short-range interaction between atoms. The absorption coefficient explicitly takes into account the quantum nature of the optical field. The ability of the system to absorb or emit quanta is quantitatively expressed through the special form of interaction integrals. The specific form of integrals results from the structure of the quantum brackets. The interplay between the collective (virtual photon exchange) and binary (optically induced inter-particle bonding) processes determines the system behavior. The spectral profile of the local absorption coefficient for different atomic densities and time intervals is simulated for realistic parameters.

Item Type: Article
Uncontrolled Keywords: Light absorption; Interacting atomic gas; Quantum optical regime
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms Zaharah Ramly
Date Deposited: 26 May 2022 02:48
Last Modified: 26 May 2022 02:48

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