Characteristics of photonic nanojets from two-layer dielectric hemisphere

Liu Yunyue¹, Liu Xianchao^{1, 2}, Li Ling¹, Chen Weidong¹, Chen Yan¹, Huang Yuerong¹, Xie Zhengwei^{1, †}

(color online) (a) The effective length L, (b) FWHM w, (c) intensity I_P, and (d) figure of merit Q as a function of the refractive indexes of the shell (n_s) and core (n_c). In each illustration, the part above on the dotted line represents the situations when n_s > n_c. The normalized intensity distributions of photonic nanojets generated from hemispheres with (e) n_s = 1.8, n_c = 1.55, and (f) n_s = 1.3, n_c = 1.55.