Abstract
We study the interaction of a mode propagating in a planar waveguide with a three--dimensional rectangular defect (protrusion or notch) in the structure. The scattering by the defect disturbes the propagation of the mode and light is coupled out of the waveguide. To investigate these phenomena we compute electric field distributions with the Green's tensor technique and show movies with varying defect geometries and different mode polarizations. These calculations should be useful for optimizing specific elements in complex photonic circuits.
Highlights
In many applications the coupling of optical energy out of or into a waveguide is obtained by a grating deposited on top of the structure [1]
We study the interaction of a mode propagating in a planar waveguide with a three–dimensional rectangular defect in the structure
The scattering by the defect disturbes the propagation of the mode and light is coupled out of the waveguide
Summary
In many applications the coupling of optical energy out of or into a waveguide is obtained by a grating deposited on top of the structure [1].
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