Abstract
Topology optimization is used to design a planar photonic crystal waveguide component resulting in significantly enhanced functionality. Exceptional transmission through a photonic crystal waveguide Z-bend is obtained using this inverse design strategy. The design has been realized in a silicon-on-insulator based photonic crystal waveguide. A large low loss bandwidth of more than 200 nm for the bandgap polarization is experimentally confirmed.
Highlights
The planar photonic crystal (PhC) is an optical nano-material with periodic modulation of the refractive index
No bandgap-based PhC components have been demonstrated with satisfactory performance in a broad wavelength range
The measured transmission spectrum has been normalized to a transmission spectrum for a straight PhC waveguide of the same length
Summary
The planar photonic crystal (PhC) is an optical nano-material with periodic modulation of the refractive index. The modulation is designed to forbid propagation of light in certain wavelength ranges, so-called photonic bandgaps (PBGs) [1,2,3]. Breaking the crystal symmetry by introducing line defects and other discontinuities allows control of the light on a subwavelength scale in the PhCs. photonic devices based on the PBG effect may be up to one million times smaller than traditional integrated optical devices. PhC structures with 20-40 nm useful optical bandwidths have previously been demonstrated [4,5,6]. No bandgap-based PhC components have been demonstrated with satisfactory performance in a broad wavelength range. Most PhC design structures today are obtained either by intuition or by varying one or two design parameters—typically the position or size of a PhC element— using the trial-and-error method
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