BibTex format

author = {Makwana, M and Craster, R and Guenneau, S},
doi = {10.1364/OE.27.016088},
journal = {Optics Express},
pages = {16088--16102},
title = {Topological beam-splitting in photonic crystals},
url = {},
volume = {27},
year = {2019}

RIS format (EndNote, RefMan)

AB - 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 possible using a square, or rectangular, lattice. To achieve splitting and transport around a sharp bend we use accidental, and not symmetry-induced, Dirac cones. Within each cell pillars are either arranged around a triangle or square; we demonstrate the mechanism of splitting and why it does not occur for one of the cases. The theory is developed and full scattering simulations demonstrate the effectiveness of the proposed designs.
AU - Makwana,M
AU - Craster,R
AU - Guenneau,S
DO - 10.1364/OE.27.016088
EP - 16102
PY - 2019///
SN - 1094-4087
SP - 16088
TI - Topological beam-splitting in photonic crystals
T2 - Optics Express
UR -
UR -
UR -
VL - 27
ER -