In this paper, we present an approach to improving the performance of surface relief type augmented reality (AR) glasses by introducing the gap plasmonic mode at the input coupling grating. Our results demonstrate that the gap plasmonic mode interacts with the incoming light from the light engine, leading to a significant increase in diffraction efficiency at the desired wavelength range. Moreover, the proposed structure exhibits a high diffraction efficiency at a wide angle of incidence, thanks to the magnetic mie resonance mode at the gap plasmonic mode. We used a DOE waveguide consisting of an incoupler and an outcoupler and compared the efficiency by measuring the eyebox efficiency at a certain distance from the outcoupler. The metal used for deposition was silver, and we observed a final efficiency increase of 3-4 times.
In this work, we report a novel method to mitigate the dependency of incident angle on diffraction efficiency by depositing a metal film on the grating structure. Moreover, the metallic structures strongly enhance the interaction between the incoming light and the nanostructures, leading to an improvement in diffraction efficiency. The results have shown the potential to overcome the bottleneck of augmented reality glasses, which require a large field of view with high efficiency.
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