Comparative Analysis of Key Parameters of Photonic Nanojets from Axisymmetric Nonspherical Microparticles

The effect of "photonic nanojet" (PNJ) arising in the near-field scattering region at the surface of dielectric axisymmetric microparticles (hemisphere, axicon, combined particles) under optical illumination is considered theoretically. Numerical calculations of PNJ key parameters (length, width, peak intensity) were performed using the method of discrete-dipole approximation; the dependence of jet’s key parameters on the geometric shape of the microparticles is analyzed. We show that using a special type of combined transparent particles consisting of an axicon and two attached hemispheres, ultra-localized light fluxes with a peak intensity considerably exceeding the corresponding values for particles of simple shapes (hemisphere, axicon) can be realized.

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