Tunable twin photonic hooks generated by a double-layer fan-shaped microcylinder

A double-layer fan-shaped configuration for generating twin photonic hooks (t-PHs) is investigated. The t-PHs properties from this configuration are investigated and optimized using Finite-Difference Time-Domain (FDTD) method. The results show that t-PHs properties can be flexibly tuned by adjusting the opening angles, sizes of double-layer fan-shaped microcylinder and background refractive index. Especially, under 632 nm illumination, t-PHs with a maximum of 20.6λ and a maximum bending angle of 50.3° are obtained. The high-performance t-PHs from our simple scheme offers innovative applications for fields of nanolithography, as well as integrated optics.