Slot Waveguide Mode

The model analyses the mode propagation within a nano slot waveguide. In a slot waveguide configuration, two high refractive index slabs (~3.48) are placed adjacent to the low refractive index slot (~1.44). Mode analysis was performed on a 2D cross section of a slot waveguide for an operating wavelength of 1.55[um]. Further analysis was carried out to optimize the width of the slot to deliver maximum optical power and optical intensity through the slot area.

Silicon Slot Waveguide

Waveguide with a slot width as large as 320nm. This strip-to-slot mode converter is optimized to provide a measured insertion loss as low as 0.08dB. Our mode converter provides 0.1dB lower loss compared to a conventional V-shape mode converter. This mode converter is used to couple light into and out of a 320nm slot photonic crystal waveguide. The effective index variation of the guided mode for a Si 3 N 4 /SiO 2 multiple (triple)-slot structure as a function of the bulk (fluid) refractive index variation has been estimated to be improved by 20% as compared to that of a single-slot waveguide. This is a consequence of a larger localization of the E-field of the propagating optical. Polaritonic slot waveguides have been explored as a means of manipulating nanoscale fields to compete in the race for the sub-diffractional confinement of light.

This model example illustrates applications of this type that would nominally be built using the following products:

however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:

• COMSOL Multiphysics^®and

Slot Waveguide Modes

The combination of COMSOL^® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.