Polarization-Controlled Nanogap Cavity with Dual-Band and Spatially Overlapped Resonances

Metasurfaces are ultrathin, two-dimensional arrays of subwavelength resonators, which can possess optical properties unobtainable naturally. One such desirable property is dual-band absorption occurring at the same spatial location, which could enable the enhancement of multiple processes simultaneously. However, demonstrations of multiband absorption to date have been limited to the mid-infrared and microwave regimes. Here, metasurfaces are...