Fig. 1. Model structure schematic diagram

Fig. 2. Comparison of scattering cross sections with and without silver cladding outside chiral sphere (chiral parameter κ=0.5, thickness of silver shell is 5 nm, the numbers near the peaks indicate the radial numbers ν, the inset shows the charge distributions at the corresponding wavelengths; the following row shows the distributions of electric field components Ez at chiral parameters κ=0.5 and ν=2,3,4,5 in the z=0 plane)

Fig. 3. Optical force and optical torque with or without a silver shell outside the chiral sphere with a silver shell thickness of 5 nm and κ=0.5. (a) Optical force F_z; (b) optical torque T_z

Fig. 4. Optical response of core-shell structures and variation of optical force with shell thickness t for κ=0.5. (a) Scattering spectra; (b) optical force; (c) optical torque

Fig. 5. Distributions of electric field components Ez in the z=0 plane corresponding to different silver shell thicknesses

Fig. 6. Optical response of core-shell structures and variation of optical force with shell thickness t for κ=0.2. (a) Scattering spectra; (b) optical force; (c) optical torque

Fig. 7. Optical response of core-shell structures and variation of optical force with shell thickness t for κ=0.8. (a) Scattering spectra; (b) optical force; (c) optical torque