Journal
OPTICS LETTERS
Volume 30, Issue 15, Pages 1989-1991Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.30.001989
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We propose an optical circulator formed of a magneto-optical cavity in a 2D photonic crystal. With spatially engineered magnetic domain structures, the cavity can be designed to support a pair of counterrotating states at different frequencies. By coupling the cavity to three waveguides, and by proper matching of the frequency split of the cavity modes with the coupling strength between the cavity and the waveguide, ideal three-port circulators with complete isolation and transmission can be created. We present a guideline for domain design needed to maximize the modal coupling and the operational bandwidth for any given magneto-optical constant. (c) 2005 Optical Society of America.
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