Abstract
Utilizing the diffractive effect of the output light fields from photonic nanojets, a newscheme for a microsphere array is designed to focus an incident wave to achievesubwavelength resolution in the far field. The three-dimensional finite-differencetime-domain (FDTD) method has been introduced to investigate the beam focusingphenomenon along the propagation direction. According to the numerical calculationresults, we find that a focal spot with a full width at half maximum (FWHM) of0.63λ can be achievedat a distance of 20.4λ away from the exit plane of the microsphere array with a refractive indexn = 1.45. We show that the properties of the focal spot will be diverse with the changes of therefractive index, the incident wavelength, and the arrangement of the array. This potentialrelationship is explicitly analyzed.
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