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Robust chirality through merging BICs
Jue Li1, Haoye Qin2, Qinghua Song3
1Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
Light, Science & Applications
|April 23, 2026
Summary
Researchers demonstrate robust chirality using bound states in the continuum (BICs). This method achieves ultrahigh-Q resonances and strong chiroptical responses for advanced optical applications.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
Background:
- Bound states in the continuum (BICs) are known for supporting high-quality factor (Q) resonances.
- Chirality in optical systems is crucial for applications like polarization control and sensing.
- Achieving strong chirality simultaneously with high-Q factors has been a significant challenge.
Purpose of the Study:
- To demonstrate a novel mechanism for achieving robust chirality.
- To explore the merging of multiple accidental bound states in the continuum (BICs) for enhanced optical properties.
- To achieve ultrahigh-Q resonances and strong chiroptical responses in a planar dielectric platform.
Main Methods:
- Exploiting the merging of multiple accidental bound states in the continuum (BICs).
- Utilizing a planar dielectric platform for optical response.
- Analyzing the momentum space for resonance and chiroptical properties.
Main Results:
- Demonstrated robust chirality through the merging of BICs.
- Achieved ultrahigh-Q factor resonances (~10⁴).
- Obtained strong chiroptical responses with near-perfect circular dichroism (~0.99) across a wide momentum space.
Conclusions:
- The merging of BICs provides a robust pathway to simultaneously achieve ultrahigh-Q resonances and strong chiroptical effects.
- This approach offers a promising platform for developing advanced optical devices with tailored polarization properties.
- The demonstrated technique is effective in planar dielectric structures, simplifying fabrication and integration.
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