# Topological beam-splitting in photonic crystals.

@article{Makwana2019TopologicalBI, title={Topological beam-splitting in photonic crystals.}, author={Mehul P. Makwana and Richard V. Craster and S{\'e}bastien Guenneau}, journal={Optics express}, year={2019}, volume={27 11}, pages={ 16088-16102 } }

We create a passive wave splitter, created purely by geometry, to engineer three-way beam splitting in electromagnetism in transverse electric and magnetic polarisation. We do so by considering arrangements of Indium Phosphide dielectric pillars in air, in particular we place several inclusions within a cell that is then extended periodically upon a square lattice. Hexagonal lattice structures are more commonly used in topological valleytronics but, as we discuss, three-way splitting is only…

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