tailoring infrared refractory plasmonic material to broadband circularly polarized thermal emitter

Circularly polarized (cp) thermal emission possesses huge application value in the fields of infrared detecting and polarimetric thermal imaging; however, the naturally occurring infrared source is incoherent and unpolarized. in this paper, we designed a broadband cp source adaptive for high temperature in consideration of the collision frequency of the electrons increasing with temperature. compared with the structure proposed before, “i”-shaped resonators based on refractory plasmonic material generate the linearly polarized (lp) emission and the dielectric quarter-wave plate enhances the degree of emitted cp by suppressing the parasitic radiation. more than 80 % right-handed circularly polarized (rcp) emissivity in wavelengths ranging from 3.28 to 4.81 μm within 706 to 884 k is theoretically achieved.