Abstract
A photonic nanojet (PNJ) is a highly focused optical beam with a subwavelength waist on the shadow side of the dielectric microparticle. In this paper, we propose and numerically investigate the PNJ formed by a micro/nanofiber (MNF) array. Three-dimensional finite-difference time-domain (FDTD) simulations are conducted and demonstrate that an ultra-narrow photonic nanojet with a full-width at half maximum (FWHM) waist of 0.2λ can be obtained. Besides, key characteristic parameters of PNJ, including PNJ length, maximum intensity, and FWHM can be flexibly tuned by modifying the refractive index of the MNF, the diameter of the MNF, and the incident wavelength.
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