期刊
OPTICS LETTERS
卷 40, 期 24, 页码 5806-5809出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.40.005806
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- U.S. Department of Energy (DOE) through the Laboratory Directed Research and Development (LDRD) Program at Los Alamos National Lab
The kagome lattice is a two-dimensional network of corner-sharing triangles and is often associated with geometrical frustration. In particular, the frustrated coupling between waveguide modes in a kagome array leads to a dispersionless flat band consisting of spatially localized modes. Here we propose a complex photonic lattice by placing PT symmetric dimers at the kagome lattice points. Each dimer corresponds to a pair of strongly coupled waveguides. With balanced arrangement of gain and loss on individual dimers, the system exhibits a PT - symmetric phase for finite gain/loss parameter up to a critical value. The beam evolution in this complex kagome waveguide array exhibits a novel oscillatory rotation of optical power along the propagation distance. Long-lived local chiral structures originating from the nearly flat bands of the kagome structure are observed when the lattice is subject to a narrow beam excitation. (C) 2015 Optical Society of America
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