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Title: Probing topological protection using a designer surface plasmon structure

Topological photonic states, inspired by robust chiral edge states in topological insulators, have recently been demonstrated in a few photonic systems, including an array of coupled on-chip ring resonators at communication wavelengths. However, the intrinsic difference between electrons and photons determines that the 'topological protection' in time-reversal-invariant photonic systems does not share the same robustness as its counterpart in electronic topological insulators. Here in a designer surface plasmon platform consisting of tunable metallic sub-wavelength structures, we construct photonic topological edge states and probe their robustness against a variety of defect classes, including some common time-reversal-invariant photonic defects that can break the topological protection, but do not exist in electronic topological insulators. Furthermore, this is also an experimental realization of anomalous Floquet topological edge states, whose topological phase cannot be predicted by the usual Chern number topological invariants.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Nanyang Technological Univ., Nanyang Link, (Singapore, Republic of). Div. of Physics and Applied Physics, School of Physical and Mathematical Sciences
  2. Nanyang Technological Univ., Nanyang Link, (Singapore, Republic of). Div. of Physics and Applied Physics, School of Physical and Mathematical Sciences; Zhejiang Univ., Hangzhou (China). State Key Laboratory of Modern Optical Instrumentation
  3. Massachusetts Inst. of Technology, Cambridge, MA (United States). Dept. of Physics
  4. Zhejiang Univ., Hangzhou (China). State Key Laboratory of Modern Optical Instrumentation; Massachusetts Inst. of Technology, Cambridge, MA (United States). Dept. of Physics
  5. Massachusetts Inst. of Technology, Cambridge, MA (United States). Dept. of Physics; Chinese Academy of Sciences, Beijing (China). Beijing National Laboratory for Condensed Matter Physics, Inst. of Physics
  6. Nanyang Technological Univ., Nanyang Link, (Singapore, Republic of). Div. of Physics and Applied Physics, School of Physical and Mathematical Sciences,Centre for Disruptive Photonic Technologies
  7. Nanyang Technological Univ., Nanyang Link, (Singapore, Republic of). Div. of Physics and Applied Physics, School of Physical and Mathematical Sciences, Centre for Disruptive Photonic Technologies
Publication Date:
OSTI Identifier:
1270875
Grant/Contract Number:
SC0001299
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Nanyang Technological Univ. (Singapore, Republic of)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) MIT S3TEC EFRC
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE insulators; photonics; states