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The Si3N4 waveguide offers very low propagation loss and feasibility for three-dimensional photonic integration, but it suffers from large optical mode size (thus low integration density) due to the relatively small refractive index contrast between the Si3N4 core and the SiO2 cladding. On the other hand, the metal-insulator-metal plasmonic waveguide offers very tight light confinement but it suffers...
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