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Manifestation of Extremely High-Q Pseudo-Modes in Scattering of a Bessel Light Beam by a Sphere

The exact analytical solution of Maxwell equations for a Bessel light beam scattered by a sphere is found. Scattered power, stored energy and a generalized Q factor as a function of frequency, the sphere radius, permittivity, and the Bessel beam angle are found. On the base of this solution, modes and pseudo-modes of a dielectric sphere are extracted by calculation of the generalized Q factor. It is shown that an appropriate choice of Bessel beam parameters can provide excitation of a single given mode and an unlimited value of the radiative Q factor of pseudo-modes.

preprint2020arXivOpen access
Vasily Klimov
physics.opticsquant-ph
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Vasily Klimov

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