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187. Optical forces and optical force categorizations on small magnetodielectric particles in the framework of generalized Lorenz-Mie theory.

Author

Gouesbet, Gérard, Angelis, V.S. De, and André Ambrosio, Leonardo

Subjects
*MIE scattering, *PLANE wavefronts
Abstract

• Optical forces for magnetodielectric particles are studied in the frame- work of generalized Lorenz-Mie theory. • The categorization of forces distinguishes gradient, scattering and non- standard forces. • The physical meaning of non-standard forces is discussed. A previous study has been devoted to the case of optical forces exerted on Rayleigh particles in the framework of generalized Lorenz-Mie theory (GLMT). This study is here extended to the case of small magnetodielectric particles which are characterized by their electric and magnetic Mie coefficients a 1 and b 1 respectively. A partition of optical forces between incident-scattered mixed terms and recoil terms has been established in GLMT since more than three decades. This partition is here complemented by another partition between gradient, scattering and non-standard forces. The relationship between these non-standard forces and curl forces exhibited in the framework of a dipole theory is emphasized. The case of Rayleigh particles (more generally of electric dipolar particles) previously published in the GLMT-framework is recovered as a special case of the case of small magnetodielectric particles discussed in the present paper. The case of illumination by plane waves furthermore provides complementary insights on the behavior of non-standard forces. [ABSTRACT FROM AUTHOR]

Published
2022
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