Exceptional-point dynamics in photonic honeycomb lattices with PT symmetry

Hamidreza Ramezani, Tsampikos Kottos, Vassilios Kovanis, Demetrios N. Christodoulides

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)


We theoretically investigate the flow of electromagnetic waves in complex honeycomb photonic lattices with local PT symmetries. Such PT structure is introduced via a judicious arrangement of gain and loss across the honeycomb lattice, characterized by a gain and loss parameter γ. We found a class of conical diffraction phenomena where the formed cone is brighter and travels along the lattice with a transverse speed proportional to √γ.

Original languageEnglish
Article number013818
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
Publication statusPublished - Jan 17 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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