Exploiting virtual three-dimensional asymmetry for planar intrinsic chirality

초록

Intrinsic chirality at optical wavelengths often relies on 3D nanofabrication or loss engineering. Here, we realize strong intrinsic chirality in a simple planar, single-height metasurface by exploiting substrate-induced virtual 3D asymmetry. Hybridized electric-and magnetic-dipole resonances yield optical chirality, and an in-plane perturbation guided by a nonlocal mode that reveals its critical role in intrinsic chirality tunes cross-polarized transmission phases to maximize circular dichroism (CD). Simulations predict CD = 0.97 near 935 nm, and fabricated devices exhibit a pronounced CD resonance, with peaks of 0.57 and 0.62 under frontside and backside illuminations, validating intrinsic chirality and the planar metasurface strategy. (c) 2026 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

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