Fig. 4 | Nature Communications

Fig. 4

From: Ultra-high on-chip optical gain in erbium-based hybrid slot waveguides

Fig. 4

Modal analysis of the hybrid slot waveguides. a Simplified cross-section and electric field distribution (|Ex|2) of the first-order TE-mode at λ = 1533 nm of the studied Er:Al2O3–Si3N4 hybrid slot waveguides. b Electric field distribution (|Ey|2) of the first-order TM-mode for the corresponding cross-section and wavelength. The following refractive indices were used in the modeling: \(n_{{\mathrm{SiO}}_{\mathrm{2}}} = 1.466\), \(n_{{\mathrm{Er:Al}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{3}}} = 1.650\), \(n_{{\mathrm{Si}}_{\mathrm{3}}{\mathrm{N}}_{\mathrm{4}}} = 1.997\)

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