What question did this study set out to answer?

The aim is to explore the potential of a planar metasurface in achieving significant circular dichroism (CD) via toroidal quasi-bound states.

March 10, 2026Advanced Optical Materials0 citations

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Giant and Rapidly Switching Intrinsic Chirality Enabled by Toroidal Quasi‐Bound States in the Continuum (Advanced Optical Materials 8/2026)

SKShijie KangHong Kong University of Science and Technology JYJiusi YuGuangzhou Institute of Advanced Technology BGBoyuan GeGuangzhou Institute of Advanced Technology

Key Points

The aim is to explore the potential of a planar metasurface in achieving significant circular dichroism (CD) via toroidal quasi-bound states.
Developed a planar metasurface designed to enhance circular dichroism.
Utilized toroidal-dipole-dominated quasi-bound states in the continuum (Q-BIC).
Conducted experiments to measure CD and switching capabilities.
Achieved near-unity circular dichroism.
Demonstrated rapid, angle-sensitive switching of the CD.
Showed potential for applications in polarization- and angle-selective photonic devices.

Abstract

Toroidal Quasi-BIC Circular dichroism (CD) is vital for chiral light-matter interactions but weak in natural materials. In the Research Article (DOI: 10.1002/adom.202501368), Haitao Li, Xiaoxiao Wu, and co-workers demonstrate a truly planar metasurface enabling giant CD via a toroidal-dipole-dominated chiral Q-BIC. It achieves near-unity CD and fast, angle-sensitive switching, promising for polarization- and angle-selective photonic devices.

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Giant and Rapidly Switching Intrinsic Chirality Enabled by Toroidal Quasi‐Bound States in the Continuum (Advanced Optical Materials 8/2026)

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