Abstract
An in-line slot waveguide sensor built in a polished flat platform of a D-shaped silicon cored fiber with a taper coupled region is proposed and investigated thoroughly. Simulation results show that the single-mode light field sustained in the silicon cored fiber can be efficiently transferred to the slot waveguides through the tapered region. The geometry parameters of the slot waveguide sensors are optimized to have the corresponding highest power confinement factors and the resultant sensor sensitivities. The three-slot waveguide sensor is found to have the best performance among one-, two- and three-slot waveguides at the mid-IR wavelength.
Highlights
The simulation model of a slot waveguide built in a DSCF and the cross-section of the slot region are shown in Figure 4a,b, respectively
The proposed method of light coupling was capable of sustaining a single-mode light field from a mid-IR SMF to the slot waveguide in a tapered DSCF
The field enhancement in the slot waveguide was confirmed, and power confinement factor (PCF), the critical parameter affecting the sensitivity of SW sensor, were optimized with slot widths by using both 2D and 3D FDTD for one, two- and three-slot waveguides
Summary
A slotand waveguide usually has slot width in parameters the order of a few tens of nanom the tapered the D-shaped regions The key such as slot width, is embedded in a silicon waveguide structure on a silicon photonic platform, usu slot separation, and the number of slots for the best performance of slot waveguides are optimized. As coupling pointedinto outaby a vertical non-coplana goes through a second slotReference waveguide.[13], As a such common practice or in silicon ture may aincrease complexity compared toinput the parallel coplanar st photonics, grating ispackaging adopted for the first light coupling as the port of theor silicon waveguide [12] In such a coupling scheme, an input fiber must be placed vertically with usually found in the light coupling between an edge-emitting semiconductor laser the slanted angleFor andthe phase-matched to the waveguide to achieve a high coupling optical fiber.
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