Chirality tuning and reversing with resonant phase-change metasurfaces.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38787955.
- Also identified by DOI 10.1126/sciadv.adn9017 and PMC identifier 11122676.
- Licence recorded as CC BY-NC.
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Abstract
Dynamic control of circular dichroism in photonic structures is critically important for compact spectrometers, stereoscopic displays, and information processing exploiting multiple degrees of freedom. Metasurfaces can help miniaturize chiral devices but only produce static and limited chiral responses. While external stimuli can tune resonances, their modulations are often weak, and reversing continuously the sign of circular dichroism is extremely challenging. Here, we demonstrate the dynamically tunable chiral response of resonant metasurfaces supporting chiral bound states in the continuum combining them with phase-change materials. Phase transition between amorphous and crystalline phases allows for control of chiral response and varies chirality rapidly from -0.947 to +0.958 backward and forward via the chirality continuum. Our demonstrations underpin the rapid development of chiral photonics and its applications.