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Phase-dependent reversible nonreciprocity in complex metamolecules

Cited 19 time in Web of Science Cited 14 time in Scopus
Authors

Yu, Sunkyu; Mason, Daniel R.; Piao, Xianji; Park, Namkyoo

Issue Date
2013-03
Publisher
American Physical Society
Citation
Physical Review B - Condensed Matter and Materials Physics, Vol.87 No.12, p. 125143
Abstract
Nonreciprocity of complex metamolecules based on the collapse of parity-time symmetry is investigated through an application to an optical waveguide array, demonstrating the strong dependency on the phase of eigenspectra. Contrary to the intuitive expectation, we reveal that more rapid and tunable nonreciprocal dynamics is achieved in the regime where the real and complex phases coexist and, furthermore, with the benefit of significantly reduced gain. It is shown that this paradoxical behavior originates from the effect of "spatial trapping modes," which hinder the energy transfer within the metamolecule due to decreased effective coupling between waveguides. As an application, we demonstrate the novel phenomenon of "reversible nonreciprocity," based on the manipulation of a single trapping mode. DOI: 10.1103/PhysRevB.87.125143
ISSN
1098-0121
URI
https://hdl.handle.net/10371/202333
DOI
https://doi.org/10.1103/PhysRevB.87.125143
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  • College of Engineering
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