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We present a new model to investigate the behavior of metallic gratings. Resonators sustaining coupled plasmonic modes are introduced as the building blocks of gratings. We show with this refined model of the unit resonator the emergence of a new and unexplored outlook of grating architectures.
Subwavelength cavities are obtained by replacing conventional mirrors with reflecting metasurfaces that introduce arbitrary phase-shifts compensating for reduced accumulated phase through the ultra-small cavity. 100-nm cavities showed resonance in the range (0.6 – 1.1µm).
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