Metallic-Dielectric Layer Based Hyperbolic Mode Resonances in Planar Waveguides

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Abstract

In this research article, we present a comprehensive investigation into the integration of dielectric and metallic layers on optical waveguides, specifically targeting sensing applications. By utilizing a single bilayer of metal and dielectric on a planar waveguide that meets the conditions of a hyperbolic metamaterial, we significantly enhance the visibility of lossy mode resonances generated with a single dielectric layer, in what can be considered as a hyperbolic mode resonance (HMR), without compromising sensitivity. This improvement leads to an enhanced figure of merit and a reduction of the signal-to-noise ratio. Real-time evolution of spectra during the dielectric layer deposition allows us to establish a map of the multiple phenomena involved, such as surface plasmon resonance, lossy mode resonance, and mode transition. Combining these phenomena in a single structure leads to an unprecedented enhancement in sensing capabilities, demonstrating the potential of dielectric-metallic layer integration on optical waveguides for advanced sensing applications. Moreover, the optimized sensing performance offers promising opportunities for on-chip sensing devices and various applications in biomedicine, environmental monitoring, and chemical analysis.

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Gonzalez-Salgueiro, L., Villar, I. D., Corres, J. M., Goioechea, J., & Matias, I. R. (2024). Metallic-Dielectric Layer Based Hyperbolic Mode Resonances in Planar Waveguides. Journal of Lightwave Technology, 42(13), 4626–4635. https://doi.org/10.1109/JLT.2024.3369857

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