ArticleiScience2026
Dissymmetrical planar gratings enabled actively chiral perfect absorber.
Article in iScience, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
Chiral perfect absorbers capable of actively manipulating circularly polarized light are highly desirable for polarization-selective devices, stereoscopic displays and chiral sensing. However, achieving a strong chiroptical response, active tunability, fabrication simplicity, and high sensitivity simultaneously remains challenging. Here, we propose an actively tunable chiral perfect absorbers comprising a dissymmetrical planar chiral grating, dielectric spacer and metallic reflector. The grating provides intrinsic spin-selective reflection through geometry-dependent plasmonic resonances, while the Fabry-Pérot cavity enhances and spectrally tailors this response via multiple-beam interference. By actively modulating the effective optical path length through cavity-length, refractive-index, or vanadium dioxide, the reflective circular dichroism is continuously tuned from nearly zero to ∼0.94. The optimized structure exhibits a refractive-index sensitivity of ∼1600 RIU
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