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Addressing the limitations of current chiral metasurfaces with narrow operational bandwidths and monotonous functionality, this paper proposes a dual-frequency phase-change tunable terahertz chiral metasurface device based on vanadium dioxide (VO 2 ). This innovation achieves functions such as anomalous reflection and near-field densification. This design employs temperature-controlled regulation of VO 2 conductivity to achieve strong circular dichroism (CD) responses of 0.81 and −0.82 at 3.17 and 3.87 THz, respectively. When arrayed, the metasurface generates approximately ±20 ∘ chiral anomalous reflection at both operating frequencies and supports near-field encryption imaging based on its mirroring properties. This device holds significant application value in the fields of terahertz absorption, polarization conversion, and chiral imaging.
HONGYAN et al. (Mon,) studied this question.