Optical fluxes in coupled $\cal PT$-symmetric photonic structures

Author
Ge, Li · Makris, Konstantinos G · Zhang, Lingxuan
Year 2017
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Abstract

In this work we first examine transverse and longitudinal fluxes in a $\cal PT$-symmetric photonic dimer using a coupled-mode theory. Several surprising understandings are obtained from this perspective: The longitudinal flux shows that the $\cal PT$ transition in a dimer can be regarded as a classical effect, despite its analogy to $\cal PT$-symmetric quantum mechanics. The longitudinal flux also indicates that the so-called giant amplification in the $\cal PT$-symmetric phase is a sub-exponential behavior and does not outperform a single gain waveguide. The transverse flux, on the other hand, reveals that the apparent power oscillations between the gain and loss waveguides in the $\cal PT$-symmetric phase can be deceiving in certain cases, where the transverse power transfer is in fact unidirectional. We also show that this power transfer cannot be arbitrarily fast even when the exceptional point is approached. Finally, we go beyond the coupled-mode theory by using the paraxial wave equation and also extend our discussions to a $\cal PT$ diamond and a one-dimensional periodic lattice.

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Details

Title
Optical fluxes in coupled $\cal PT$-symmetric photonic structures
Author
Ge, Li · Makris, Konstantinos G · Zhang, Lingxuan
Year
2017
Type
Research Article
Language
eng
Comment
8 pages, 6 figures
History
2017-06-15 00:00:00
Categories
Optics
This is Version 1 of this record. We added this version on June 17, 2017. This version is based on an original data import from arXiv.org e-Print archive.