Tunable near-infrared photonic nanostructure: employing the phase transition of GSST for extraordinary optical transmission

This paper presents a reconfigurable plasmonic structure consisting of a phase-change material slab, Ge 2 Sb 2 Se 4 Te 1 (GSST), overlaid with a fishnet pattern comprising two dielectric layers containing quantum dots, sandwiching a silver metal layer. We demonstrate the distinct optical tunability of this structure by exploiting the phase transition of GSST from its amorphous to crystalline state in the near-infrared spectrum. Our findings reveal significant tunable contrasts in the structure transmission coefficient that leads to achieve extraordinary optical transmission (EOT). These results highlight the structure’s potential for adaptive optics and reconfigurable photonic applications.