Topology-optimized photonic binary dielectric (black)/air (white) square lattices which will give rise to third order Dirac exceptional points.

From the article:

Enhanced Spontaneous Emission at Third-Order Dirac Exceptional Points in Inverse-Designed Photonic Crystals
Zin Lin, Adi Pick, Marko Lončar, and Alejandro W. Rodriguez
Phys. Rev. Lett. 117, 107402 (2016)

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