Magnetic Surface Plasmons on a Subwavelength Negative-Permeability Magnetized Vapor Sphere

Abstract

Localized surface plasmons sustained on a nanoscale metal sphere have been extensively investigated in various research fields. Such modes of surface plasmons are electric field bound eigenstates on a subwavelength negative-permittivity sphere, and can be referred to as “electric surface plasmons”. We will suggest the other surface plasmons, i.e., the magnetic surface plasmons, which can also be confined on a subwavelength negative-permeability magnetized vapor sphere. It will be shown that a negative permeability of atomic vapor can be realized if we take full advantage of fine- and hyper-fine magnetic-dipole allowed transition. It can be found that a spherically symmetric atomic vapor cell filled with an alkali metallic atomic vapor would exhibit a negative permeability under certain conditions. The spatial profiles of magnetic-type surface plasmon eigenstates will be studied by using the formalisms of both magnetic scalar potential and magnetic vector potential.
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