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Updated: Sep 9, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
Published on: July 18, 2015
Dissymmetrical planar gratings enabled actively chiral perfect absorber
Xiu Yang1,2, Hao Jiang1, Jialong Peng3
1Department of General Education, Sichuan Police College, Chengdu 610206, China.
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-1 at d = 100 μm, a cavity-length sensitivity of ∼0.064 nm-1 at n = 4.0, and an ultrahigh temperature resolution of ∼2.7 × 10-8°C. This scalable architecture enables actively reconfigurable chiroptical devices and high-precision sensing.
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