extraordinary optical transmission performances of nanosandwiched grating for wideband multi-function integration

In this paper, we present a peculiar metal-dielectric-metal (mdm) nanosandwich grating structure that can achieve extraordinary optical transmission performances at normal incidence in the ultraviolet-visible-near infrared (uv-vis-nir) regions. the proposed structure shows three obvious spectrum characteristics: it can obtain high transmittance up to 80 % in nuv region and efficiently blocking visible wavelengths for transverse-magnetic (tm) polarized incidence; a broadband nir polarizer can be inspired in the wavelength range from 950 to 1400 nm; more surprisingly, these performances do not deteriorated until 30° tilting angle. compared to other grating structures with single metal overlayer, it shows wider band-stop characteristics and higher broadband transmission transmittance and extinction ratio (er) in the investigated wavebands. we analyze the underlying physical mechanism by using numerical simulation, which is primarily attributed to metal ultraviolet transparency, surface plasmon polariton (spp) at metal/dielectric interface, fabry–perot (fp)-like cavity mode within this dielectric grating, and optical magnetic resonance especially in the dielectric interlayer of the mdm sandwiched structure. this structure is very important for developing high-performance subwavelength multifunctional integrated optical devices.