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Localized photonic bandedge modes and orbital angular momenta of light in a golden-angle spiral

We present a numerical study on photonic bandgap and bandedge modes in the golden-angle spiral array of air cylinders in dielectric media. Despite the lack of long-range translational and rotational order, there is a large PBG for the TE polarized light. Due to spatial inhomogeneity in the air hole spacing, the bandedge modes are spatially localized by Bragg scattering from the parastichies in the spiral structure. They have discrete angular momenta that originate from different families of the parastichies whose numbers correspond to the Fibonacci numbers. The unique structural characteristics of the golden-angle spiral lead to distinctive features of the bandedge modes that are absent in both photonic crystals and quasicrystals.

preprint2011arXivOpen access
Seng Fatt LiewHeeso NohJacob TrevinoLuca Dal NegroHui Cao
physics.optics
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Open access5 authors1 topic
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Seng Fatt LiewHeeso NohJacob TrevinoLuca Dal NegroHui Cao

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