Author Affiliations
1Institute of Applied Physics and Computational Mathematics, Beijing 100088, China2Beijing Computational Science Research Center, Beijing 100193, China3Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China4e-mail: haiqing0@csrc.ac.cn5e-mail: zhang_wei@iapcm.ac.cnshow less
Fig. 1. Scheme of the metasurface made of arrays of twisted nanorod dimers.
Fig. 2. Extinction cross sections of a dimer with twist angle π/4 and separation z0=200 nm for LCP and RCP light. Solid/dashed lines are the results calculated by CDM/FDTD.
Fig. 3. Transmittances of monolayer metasurfaces with θ=0,π/6,π/3,π/2 for LCP and RCP light.
Fig. 4. Transmittance of a bilayer metasurface with parameters z0=200 nm, Λx=600 nm, Λy=300 nm. (a), (c) θ=π/3 and ϕ=π/2; (b), (d) θ=π/6 and ϕ=5π/6. (a), (b) Results based on FDTD simulation; (c), (d) those based on the CDM.
Fig. 5. (a), (b) Transmittance of a metasurface with achiral building blocks [i.e., unit cell with nanorod dimer of twist angle π/2 (θ=π/4 and ϕ=3π/4)] based on FDTD simulation. (a) Λx=600 nm,Λy=350 nm,z0=150 nm (the condition of chirality-selective transparency is satisfied); (b) Λx=400 nm,Λy=350 nm,z0=150 nm (the condition of chirality-selective transparency is violated). (c)–(f) The electric field distribution (|E|) for nanorods A and B at wavelength of 600 nm. (c), (d) The distribution at the x–y cross-section plane with z=0 (rod A)/150 nm (rod B) for LCP light; (e), (f) the distribution at the x–y cross-section plane with z=0/150 nm for RCP light. The other parameters are the same as those in (a). (g) The g-factor corresponding to (a). (h) The transmittance versus the long-axis radius of the nanorods at a wavelength of 600 nm.
Fig. 6. Transmittance of LCP/RCP light associated with higher-order resonance based on FDTD simulation. (a) θ=π/4, ϕ=3π/4, Λx=1200 nm and Λy=300 nm, z0=150 nm. k=|L(±2,0)|. (b) θ=π/4, ϕ=3π/4, Λx=931 nm and Λy=781 nm, z0=150 nm. k=|L(±1,±1)|.
Fig. 7. Transmittance of LCP/RCP light with Λx=600 nm and Λy=350 nm calculated by the FDTD method. (a) z0=90 nm, θ=7π/20, and ϕ=13π/20. (b) z0=75 nm, θ=3π/8, and ϕ=5π/8.