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Proceedings Paper

Longitudinal optical force of laser pulses in continuous media
Author(s): L. Kovachev
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Paper Abstract

From long time transverse and longitudinal optical forces are used for non-contact and noninvasive manipulation of small particle. The following question arises: What is the impact of these forces on the continuous media as air and silica. In this work we obtain analytical expressions for radiation force and radiation potential in dipole approximation of laser pulses propagating in dielectric media. The longitudinal force is proportional to the second time derivative of the intensity profile. At fixed initial energy of a laser pulse, as shorter is the pulse as bigger is the force. It is possible the neutral particles in gases and solids to be confined in the pulse envelope and to move with group velocity. In silica the longitudinal force of a femtosecond pulse is of few order of magnitude greater than molecular forces. Thus, the ablation in silica can be realized through broken molecular connections.

Paper Details

Date Published: 30 December 2019
PDF: 7 pages
Proc. SPIE 11332, International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019), 113320I (30 December 2019);
Show Author Affiliations
L. Kovachev, Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 11332:
International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019)
Alexander A. Dreischuh; Tony Spassov; Isabelle Staude; Dragomir N. Neshev, Editor(s)

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