Soliton Formation and Superluminality Effect due to Nonlinear Absorption of Femtosecond Laser Pulse Energy by the Medium Containing Nanorods

We investigate a femtosecond pulse propagation in a medium, containing nanorods, with taking into account the dependence of multi-photon absorption from the aspect ratio of nanorods. Nanorods melting due to the laser energy absorption leads to the non-stationary interaction of laser pulse with the m...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-02, Vol.691 (1), p.12012
Main Authors: Trofimov, Vyacheslav A., Lysak, Tatiana M.
Format: Article
Language:English
Subjects:
Aspect ratio
Energy absorption
Evolution
Femtosecond pulses
Lasers
Multiphoton absorption
Nanorods
Optical radiation
Physics
Propagation
Pulse propagation
Solitary waves
Thermal blooming
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Summary:We investigate a femtosecond pulse propagation in a medium, containing nanorods, with taking into account the dependence of multi-photon absorption from the aspect ratio of nanorods. Nanorods melting due to the laser energy absorption leads to the non-stationary interaction of laser pulse with the medium and time-dependent nanorod aspect ratio changing. Under certain conditions, we found out the soliton-like mode of a laser pulse propagation and the superluminality effect: acceleration of light (fast light) in comparison with light propagation in a linear medium. We discuss a physical mechanism of superluminality effect for considering laser pulse propagation. Using spatio-temporal analogy, one can see the similarity between the pulse centre evolution along longitudinal coordinate and the beam centre evolution under the infrared optical radiation propagation in a cloud, or fog, which moves across the beam, with taking into account its thermal blooming.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/691/1/012012