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We report on the calculations of optical radiation scattering at micrometer-sized conical-shape dielectric particles (microaxicons) with special attention given to the specific spatially localized near-field area constituting a photonic nanojet (PNJ). By virtue of finite-difference time-domain simulations we show for the first time, to the best our knowledge, that the PNJ produced by a microaxicon of specific spatial orientation can exhibit extreme axial elongation up to ∼25λ (at defined intensity level) while retaining high peak intensity and subwavelength transverse width.
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Geints et al. (2015) studied this question.
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