Nonreciprocal μ -near-zero mode in PT -symmetric magnetic domains

Jin Wang, Hui Yuan Dong, Chi Wai Ling, C. T. Chan, Kin Hung Fung (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


We find that a new type of nonreciprocal modes exists at an interface between two parity-time- (PT-) symmetric magnetic domains (MDs) near the frequency of zero effective permeability. This mode is nonpropagating and purely magnetic when the two MDs are semi-infinite, while it becomes propagating in the finite case. In particular, two pronounced nonreciprocal responses could be observed via the excitation of this mode: one-way optical tunneling for oblique incidence and unidirectional beam shift at normal incidence. When the two MDs system becomes finite in size, it is found that perfect-transmission mode could be achieved if PT symmetry is maintained. The unique properties of such an unusual mode are investigated by analytical modal calculation as well as numerical simulations. The results suggest a different approach to the design of compact optical isolator.
Original languageEnglish
Article number235410
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number23
Publication statusPublished - 8 Jun 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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