We propose a reconfigurable photonic crystal based on split-ring structures, which hosts tunable edge states by controlling the rotation angle of the split-rings. The split-ring structure breaks the inversion symmetry and introduces a nontrivial Dirac mass in the otherwise gapless Dirac photonic spectrum. The sign of the Dirac mass depends on the rotation angle that thus introduces two topologically distinct phases. It is shown that an interface between two split-ring photonic crystals with opposite rotation angles supports gapped edge states. Despite the topologically trivial nature of the split-ring photonic crystal, the dispersion of the edge states is tunable through the rotation angle of the split-ring, making it useful in frequency-selective beam splitters. Our study provides an alternative way for the controlling of edge states and thus can be useful for future integrated photonic circuits.
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21 November 2019
Research Article|
November 15 2019
Tunable edge states in reconfigurable photonic crystals
Hai-Xiao Wang
;
Hai-Xiao Wang
1
School of Physical Science and Technology, Guangxi Normal University
, Guilin 541004, China
2
Physics Division, National Center for Theoretical Sciences
, Hsinchu 30013, Taiwan
3
Department of Physics and Center for Theoretical Physics, National Taiwan University
, Taipei 10617, Taiwan
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Huanyang Chen
;
Huanyang Chen
4
Institute of Electromagnetics and Acoustics and Key Laboratory of Electromagnetic Wave Science and Detection Technology, Xiamen University
, Xiamen 361005, China
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Jian-Hua Jiang
;
Jian-Hua Jiang
a)
5
School of Physical Science and Technology, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
, Suzhou 215006, China
a)Authors to whom correspondence should be addressed: joejhjiang@hotmail.com and gyguo@phys.ntu.edu.tw
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Guang-Yu Guo
Guang-Yu Guo
a)
2
Physics Division, National Center for Theoretical Sciences
, Hsinchu 30013, Taiwan
3
Department of Physics and Center for Theoretical Physics, National Taiwan University
, Taipei 10617, Taiwan
a)Authors to whom correspondence should be addressed: joejhjiang@hotmail.com and gyguo@phys.ntu.edu.tw
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a)Authors to whom correspondence should be addressed: joejhjiang@hotmail.com and gyguo@phys.ntu.edu.tw
J. Appl. Phys. 126, 193105 (2019)
Article history
Received:
August 20 2019
Accepted:
October 30 2019
Citation
Hai-Xiao Wang, Huanyang Chen, Jian-Hua Jiang, Guang-Yu Guo; Tunable edge states in reconfigurable photonic crystals. J. Appl. Phys. 21 November 2019; 126 (19): 193105. https://doi.org/10.1063/1.5124893
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