Fig. 1. Schematic diagrams of a chiral unit cell composed of four helices with different radii as subunits.

Fig. 2. CD and transmittances of the structure for the RCP and LCP incident waves.

Fig. 3. Distributions of electric field intensities at different cross sections vertical to the incident direction under the RCP and LCP waves at the wavelength of 6.44 µm. (a) z = −1.2 µm; (b) z = −1.0 µm; (c) z = −0.8 µm; (d) z = −0.6 µm; (e) z =−0.4 µm; (f) z = −0.2 µm.

Fig. 4. CD curves of the original structure and single helix structures with radii of 0.30 µm, 0.35 µm, 0.40 µm, and 0.45 µm, respectively.

Fig. 5. CD properties of the structure with the different number of turns of subunits.

Fig. 6. CD properties of the original structure and structures with different components consisting of Ag and Au.

Fig. 7. Optical activity distributions of the structures with different components consisting of ITO, Ag, and Au, respectively.