Gain-induced large optical torque in optical twist settings
Li Genyan1, 2, 3, Li Xiao4, Zhang Lei2, 3, 5, Chen Jun1, 2, 3, †
Structures are the same as Figs. 3(a) and 3(b), and the refractive index of gain spheres is ngain = 2 – 0.005i. (a) Optical torques exerted on the gain–gain double-layer cluster (red and black lines) and on a single gain structure (green line). The inserts show the same rotation direction of the two layers in gain–gain double-layer cluster at resonances. The partial view of torques in panel (a) is shown in panel (b).
