What question did this study set out to answer?

The aim is to demonstrate robust chirality through the merging of accidental bound states in the continuum.

April 25, 2026Open Access

Robust chirality through merging BICs

LJLi JBeijing Institute of Fashion Technology HQHaoye QinNational University of Singapore QSQinghua SongTsinghua–Berkeley Shenzhen Institute

Key Points

The aim is to demonstrate robust chirality through the merging of accidental bound states in the continuum.
Exploitation of merged accidental bound states in the continuum.
Evaluation of quality factor Q resonances across momentum space.
Measurement of circular dichroism in a planar dielectric platform.
Achieved near-perfect circular dichroism of ~0.99.
Realized ultrahigh Q value of ~10⁴.
Demonstrated strong chiroptical responses over a wide momentum range.

Abstract

Abstract Robust chirality is demonstrated by exploiting the merging of multiple accidental bound states in the continuum (BICs). This mechanism simultaneously sustains ultrahigh-quality factor Q resonances and strong chiroptical responses across a wide region of momentum space, achieving near-perfect circular dichroism (~0.99) and an ultrahigh- Q value (~10⁴) in a planar dielectric platform.

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