Polarization controllable laser using chiral metamaterials with gain

This research introduces a highly compact chiral metamaterial design (100 nm) capable of generating Circular Polarization (CP) lasing, a topic of high scientific and technological interest. The proposed metamaterial utilizes pairs of twisted-crosses as meta-atoms, embedded within a gain medium. By controlling the crosses twist-angle we demonstrate control of the emission polarization, ranging from almost purely left- to purely right-circular polarization. Our highly engineerable metamaterial design provides a versatile and easily implementable method for producing robust and tailored CP lasers, opening up significant possibilities for future applications.