期刊
OPTICS LETTERS
卷 40, 期 22, 页码 5327-5330出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.40.005327
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- Army Research Office (ARO) [W911NF-15-1-0152]
Parity-time-symmetric (PT-symmetric) optical waveguide couplers offer a great potential for future applications in integrated optics, such as ultracompact reconfigurable all-optical signal processing. Here, we predict a nonlinearly triggered transition from a full to a broken PT-symmetric regime in finite-size systems described by smooth permittivity profiles and, in particular, in a conventional discrete waveguide directional coupler configuration with a rectangular profile. For these systems, we show that this phase transition occurs in PT-symmetric couplers, regardless of the details of their geometry, therefore suggesting a practical route for experimental realization of such systems. (C) 2015 Optical Society of America
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