Fig. 3: 3D all-dielectric metasurfaces for chiral and spectrally sharp resonances. | Light: Science & Applications

Fig. 3: 3D all-dielectric metasurfaces for chiral and spectrally sharp resonances.

From: Unlocking the out-of-plane dimension for photonic bound states in the continuum to achieve maximum optical chirality

Fig. 3

a AFM images for left-handed (yellow) and right-handed (green) structures. Both metasurfaces are illuminated with RCP and LCP light and their polarized transmittance coefficients are recorded from which we deduce the chiral transmittance difference ΔT = TRR - TLL. b LCP and RCP transmittance spectra for the achiral metasurface showing almost identical responses in the upper panel. Lower panel: Corresponding ΔT spectrum showing no chiral selective response. Spectra of LCP/RCP co- and cross-polarized transmittance of the left-handed structure in (c) and right-handed structure in (d) indicate strongly selective interaction with LCP (c) or RCP (d) light. e ΔT spectra for both handednesses show the inversion of the chiral qBIC. f ΔT peak modulation for different rotation angles \(\theta\) between the adjacent resonators for left-handed (yellow) and right-handed (green) structures showing a saturation in the left panel while the extracted Q factors decrease towards higher rotation angles as indicated in the right panel

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