Chiral perovskite based metasurface for linear and circular dichroism

Chiral metasurfaces provide ultracompact devices for polarization modification and detection. In this paper, high linear dichroism (LD) and dual band circular dichroism (CD) using superstructural chiral structure with inbuilt resonance cavities based on metal perovskite metal layer is proposed. Under circularly polarised incident waves, the metasurface exhibits a dual-band CD with a maximum value of 0.81. On the other hand, the suggested design also accomplishes efficient LD of 0.95. Additionally, independent control over each resonance wavelength may be attained by modifying parameters inside each resonance cavities. This will significantly contribute to the advancement of tunable dichroic devices and flat polarization optical components in optical integrated systems.