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) Normalized intensity distributions of photonic nanojets generated from (a) a single dielectric hemisphere with R = 3 μm, n = 1.8 and (b) a two-layer dielectric hemisphere with R_s = 3 μm, n_s = 1.8 and R_c = 1.8 μm, n_c = 1.5. The lower panel plots the intensity profile along the z direction, and the transverse profile at the focal point is also shown in the inset.