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Phys Rev Lett. 2008 Jan 11;100(1):013904. Epub 2008 Jan 10.

Possible realization of directional optical waveguides in photonic crystals with broken time-reversal symmetry.

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1
Department of Physics, Princeton University, Princeton, NJ 08544-0708, USA.

Abstract

We show how, in principle, to construct analogs of quantum Hall edge states in "photonic crystals" made with nonreciprocal (Faraday-effect) media. These form "one-way waveguides" that allow electromagnetic energy to flow in one direction only.

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