Abstract:Resonance cavity modes enhance optical transmission through sub-wavelength metallic apertures but their role in absorption remains unclear. Here, we use full field simulation and a semi-analytical model to report absorption and transmission enhancement in transmission gratings under transverse electric illumination. The fundamental cavity mode of the sub-wavelength grating cavities is the major contributor to absorption. We demonstrate the possibility of tailoring such cavity resonances to induce total absorpt… Show more
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