Electromangetic force density in electrically and magnetically polarizable media
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Fecha
2013Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
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10.1103/PhysRevA.88.053808
Resumen
The force density induced by electromagnetic fields in electrically and magnetically polarizable media is
studied analytically. Different formulations of the force density as a function of field-related quantities, including
the spatial derivatives of the fields, gradients of the field intensity, phase gradients, electromagnetic power
flow (Poynting vector field), and kinetic momentum flow, are i ...
[++]
The force density induced by electromagnetic fields in electrically and magnetically polarizable media is
studied analytically. Different formulations of the force density as a function of field-related quantities, including
the spatial derivatives of the fields, gradients of the field intensity, phase gradients, electromagnetic power
flow (Poynting vector field), and kinetic momentum flow, are introduced. These formulations retain certain
symmetries with respect to the force expressions introduced in previous works for an isolated particle but also
point out fundamental differences, such as the suppression of recoil forces, negative radiation pressure, and
far-field gradient forces. It is shown how these analytical formulations also provide the necessary means to
elucidate the sign of the force density in complex media and how they can assist the design of sources to
manipulate clouds of particles. The theory is illustrated with numerical examples of an insulated Hertzian dipole
immersed in different media, including lossy dielectrics, media with negative permittivity and permeability, and
zero-index media. [--]
Materias
Force density,
Polarizable media
Editor
American Physical Society
Publicado en
Physical Review A 88, 053808 (2013)
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila