Experimental demonstration of GeSbTe loaded 1-D plasmonic metasurface perfect absorber for near-IR wavelength regime.

Inclusion of a phase change material such as germanium-antimony-telluride (GeSbTe or GST) enhances the performance of plasmonic metasurface absorbers (PMAs). One-dimensional (1-D) plasmonic metasurfaces (PMs) support the excitation of surface plasmon modes for the normal incidence of transverse magnetically (TM) polarized light. The 1-D PMAs absorb incident light because of their confinement in the groove region, which is possible because of the surface plasmon modes excited at the metal-dielectric interface.

Giant Extra-Ordinary Near Infrared Transmission from Seemingly Opaque Plasmonic Metasurface: Sensing Applications.

In the present study, we report giant extra-ordinary transmission of near infrared (NIR) light, more than 90%, through a seemingly opaque plasmonic metasurface, which consists of two metal nano-slits arrays (MNSAs) with alternate opening arrangements. By using perfect coupling of the plasmonic modes formed between the sharp edges of the upper and lower MNSAs of silver, a giant, wavelength selective transmission could be obtained. The study is accompanied by optimization of electromagnetic (EM) field coupling for different interlayer spacings and lateral overlap between the two MNSAs to understand their significance in light transmission through the metasurface.