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Passive parity-time-symmetry-breaking transitions without exceptional points in dissipative photonic systems [Invited]

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Abstract

Over the past decade, parity-time (PT)-symmetric Hamiltonians have been experimentally realized in classical, optical settings with balanced gain and loss, or in quantum systems with localized loss. In both realizations, the PT-symmetry-breaking transition occurs at the exceptional point of the non-Hermitian Hamiltonian, where its eigenvalues and the corresponding eigenvectors both coincide. Here, we show that in lossy systems, the PT transition is a phenomenon that broadly occurs without an attendant exceptional point, and is driven by the potential asymmetry between the neutral and the lossy regions. With experimentally realizable quantum models in mind, we investigate dimer and trimer waveguide configurations with one lossy waveguide. We validate the tight-binding model results by using the beam-propagation-method analysis. Our results pave a robust way toward studying the interplay between passive PT transitions and quantum effects in dissipative photonic configurations.

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DOI:10.1364/prj.6.000a51

基金项目:National Science Foundation (NSF)10.13039/100000001 (DMR 1054020).

收稿日期:2018-01-11

录用日期:2018-06-14

网络出版日期:2018-06-28

作者单位    点击查看

Yogesh N. Joglekar:Department of Physics, Indiana University-Purdue University Indianapolis (IUPUI), Indianapolis, Indiana 46202, USA
Andrew K. Harter:Department of Physics, Indiana University-Purdue University Indianapolis (IUPUI), Indianapolis, Indiana 46202, USA

联系人作者:Yogesh N. Joglekar(yojoglek@iupui.edu)

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引用该论文

Yogesh N. Joglekar and Andrew K. Harter, "Passive parity-time-symmetry-breaking transitions without exceptional points in dissipative photonic systems [Invited]," Photonics Research 6(8), A51 (2018)

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