Dynamically encircling an exceptional point in anti-parity-time symmetric systems: asymmetric mode switching for symmetry-broken modes

Xu-Lin Zhang; Tianshu Jiang; C. T. Chan

doi:10.1038/s41377-019-0200-8

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Dynamically encircling an exceptional point in anti-parity-time symmetric systems: asymmetric mode switching for symmetry-broken modes

Articles

- Dynamically encircling an exceptional point in anti-parity-time symmetric systems: asymmetric mode switching for symmetry-broken modes
- Light: Science & Applications Vol. 8, Issue 5, Pages: 836-844(2019)
- Affiliations：
  
  1.State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China
  2.Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
- Author bio：
  
  C. T. Chan (phchan@ust.hk)
- Funds：
- DOI：10.1038/s41377-019-0200-8
  CLC：
- Published：2019，
  
  Published Online：02 October 2019，
  
  Received：12 April 2019，
  
  Revised：03 September 2019，
  
  Accepted：09 September 2019
- Accepted：
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Zhang, X. L., Jiang, T. S. & Chan, C. T. Dynamically encircling an exceptional point in anti-parity-time symmetric systems: asymmetric mode switching for symmetry-broken modes. Light: Science & Applications, 8, 836-844 (2019).
DOI：

Zhang, X. L., Jiang, T. S. & Chan, C. T. Dynamically encircling an exceptional point in anti-parity-time symmetric systems: asymmetric mode switching for symmetry-broken modes. Light: Science & Applications, 8, 836-844 (2019). DOI： 10.1038/s41377-019-0200-8.

摘要

Abstract

Dynamically encircling an exceptional point (EP) in parity-time (

) symmetric waveguide systems exhibits interesting chiral dynamics that can be applied to asymmetric mode switching for symmetric and anti-symmetric modes. The counterpart symmetry-broken modes (i.e.

each eigenmode is localized in one waveguide only)

which are more useful for applications such as on-chip optical signal processing

exhibit only non-chiral dynamics and therefore cannot be used for asymmetric mode switching. Here

we solve this problem by resorting to anti-parity-time (anti-

) symmetric systems and utilizing their unique topological structure

which is very different from that of

-symmetric systems. We find that the dynamical encircling of an EP in anti-

-symmetric systems with the starting point in the

-broken phase results in chiral dynamics. As a result

symmetry-broken modes can be used for asymmetric mode switching

which is a phenomenon and application unique to anti-

-symmetric systems. We perform experiments to demonstrate the new wave-manipulation scheme

which may pave the way towards designing on-chip optical systems with novel functionalities.

关键词

Keywords

references

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