AI Article Synopsis
- The study examines how interference affects radiation losses in a silica waveguide using a one-dimensional photonic-crystal reflector.
- An analytical model is developed to predict total radiation losses by considering the interference of waves at different waveguide interfaces, validated against numerical simulations.
- The findings challenge existing beliefs by showing that a gradual tapering from a uniform to a photonic-crystal waveguide can actually lead to higher radiation losses than optimized geometries.
Article Abstract
Interferometric behaviours in radiation generation process of a one-dimensional photonic-crystal (PhC) reflector are investigated on a silica waveguide. An analytical model, which can calculate total radiation losses, is presented after analysing eigen-mode properties and radiation pattern characteristics. Our model takes into account the interference of component radiated waves generated at interfaces between different waveguide sections and is verified by comparing with numerical simulations of periodic and non-periodic one-dimensional PhC reflectors. Its capability to quickly find minimum-radiation tapering geometries helps circumvent time-consuming numerical simulations. Our model negates the conventional knowledge that a gradually tapered transition from uniform waveguide to PhC waveguide yields lower radiation loss. In one example, the gradually tapered transition produces 2.3dB more radiation than the optimum geometry.
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| http://dx.doi.org/10.1364/OE.20.028641 | DOI Listing |
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