Abstract
Reflective photonic nanojets (r-PNJs) produced by cylindrical concave micro-mirrors are numerically investigated. Simulation shows that the full-width at half-maximum (FWHM) of the r-PNJ is associated with the angle of the cylindrical concave mirror. It is found that the FWHM of the r-PNJ can achieve 0.37 of the wavelength, when the mirror with the angle θ = 130° is put in air. For the concave mirror immersed in water with θ = 100°, the FWHM of the r-PNJ can reach about 0.3λ. Two symmetric vortexes of Poynting vectors are close to the r-PNJ, which leads to the narrowed r-PNJ. Through combining a dielectric micro-cylinder with the concave mirror immersed in water, the waist of the r-PNJ can achieve 0.27 of the incident wavelength.
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This work was supported by the open fund HGAMTL-1803 from Jiangsu Key Laboratory of Advanced Manufacturing Technology.
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Yang, W., Gao, R., Wang, Y. et al. Reflective photonic nanojets generated from cylindrical concave micro-mirrors. Appl. Phys. A 126, 717 (2020). https://doi.org/10.1007/s00339-020-03918-3
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DOI: https://doi.org/10.1007/s00339-020-03918-3