Design of chiral metasurfaces for dynamic tunable holographic imaging in Dirac semimetals

Chiral metasurfaces exhibiting near-field optical chirality serve as fundamental structures for molecular chirality sensing and radiation control. This paper presents a novel, to the best of our knowledge, analysis of the response characteristics of chiral structures to circularly polarized light. Based on these findings, we propose a gap-ring chiral metasurface that selectively induces circular dichroism (CD) through the incorporation of 3D bulk Dirac semimetals (BDS). The proposed metasurface exhibits pronounced CD effects and significant asymmetric field distributions when excited by circularly polarized light. By adjusting the Fermi levels of the BDS components, the CD parameters can be continuously modulated across a wide range from -0.88 to 0.88. Utilizing this dynamic response characteristic, we have successfully developed a reconfigurable holographic imaging metasurface. This research presents innovative approaches for chiral molecular vibration sensing, thermal radiation control, and infrared chiral imaging, highlighting substantial potential for diverse applications.