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Ultrahigh-Q and angle-robust chiroptical resonances beyond BIC splitting
Optics Letters
|December 22, 2023
Summary
Researchers developed a novel method to enhance chiral light-matter interactions using far-field interference, creating ultrahigh-quality chiroptical resonances. This technique achieves spin-selective absorption with tunable properties, offering new possibilities for chiral sensing and light manipulation.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Materials Science
Background:
- Bound states in the continuum (BICs) offer pathways to enhance light-matter interactions.
- Conventional methods for chiroptical resonances often rely on symmetry breaking to split BICs.
- Achieving ultrahigh-Q factors in chiroptical systems remains a significant challenge.
Purpose of the Study:
- To explore a new mechanism for generating chiroptical resonances beyond traditional BIC splitting.
- To achieve ultrahigh-Q chiroptical resonances with coexisting circularly polarized states (CPSs) and BICs.
- To investigate the tunability and robustness of the chiral response.
Main Methods:
- Utilized a far-field interference mechanism to create chiroptical resonances.
- Investigated the coexistence of CPSs and BICs in momentum space.
- Employed monolayer transition metal dichalcogenides (TMDCs) for regulation of spin-selective absorption.
Main Results:
- Demonstrated ultrahigh-Q chiroptical resonances (Q ≈ 2.36 × 10^6) beyond BIC splitting.
- Achieved spin-selective absorption with ultranarrow linewidth at CPS points.
- Showcased incident-direction robustness and flexible tunability of the chiral response.
Conclusions:
- A novel far-field interference mechanism enables ultrahigh-Q chiroptical resonances with coexisting BICs and CPSs.
- The developed method provides precise control over spin-selective absorption, tunable via TMDCs.
- This work opens avenues for advanced applications in chiral sensing, spin-valleytronics, and light manipulation.
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