Spectrally broad-range tunable perfect intrinsic chirality within Sb2Se3 metasurfaces.

before and after the phase transition, a 303 nm large-scale shifting of the CD resonance wavelength is achieved. Notably, the CD values can be well maintained with the intensity very near ±1, and the peak shape remains almost unchanged during the modulation. These impressive performances hold promise for metasurface-based polarization filters, highly saturated and dynamically color-changing chiral anti-counterfeiting labels, and multi-component calibration-free chiral spectral analysis.