Effect of the Contribution of the Local and Nonlocal Optical Response of an Isotropic Gyrotropic Medium on the Components of the Minkowski Energy–Momentum Tensor of the Electromagnetic Field of the Self-Focusing Beam

Abstract

Contributions of the terms related to the local and nonlocal nonlinear optical responses of a medium are determined in the expressions for the energy density, energy flux density, momentum density, and momentum flux density of the electromagnetic field at the self-focusing of elliptically polarized light in a nonabsorbing isotropic gyrotropic medium. It is shown that the contributions of the nonlinear optical response of the medium to the above quantities are maximal at the spatial points where during self-focusing of narrow elliptically polarized beams, radiation becomes linearly polarized, and they may be as large as one tenth of the contributions to the components of the Minkowski energy–momentum tensor of the electromagnetic field that are related to the linear local optical response of the medium to the external light field. Nonlocality of the optical response increases the components of the Minkowski energy–momentum tensor of the electromagnetic field in some regions of the space and decreases them in the rest of them due to the sign reversal of the degree of the self-focusing beam ellipticity.