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    Band engineering method to create Dirac cones of accidental degeneracy in general photonic crystals without symmetry

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    Type
    Article
    Authors
    Chu, Hongchen
    Zhang, Yang
    Luo, Jie
    Xu, Changqing cc
    Xiong, Xiang cc
    Peng, Ruwen cc
    Wang, Mu
    Lai, Yun cc
    KAUST Department
    Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
    Date
    2021-05-25
    Online Publication Date
    2021-05-25
    Print Publication Date
    2021-06-07
    Submitted Date
    2021-04-09
    Permanent link to this record
    http://hdl.handle.net/10754/669286
    
    Metadata
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    Abstract
    Symmetry usually plays a key role in the formation of the Dirac cone in the band structure of triangular or hexagonal systems. In this work, we demonstrate a systematic method to create Dirac cones of accidental degeneracy in general photonic crystals without symmetry. With this method, a band gap can be closed gradually through a series of modification to the unit structure based on the eigenfields of the band edges, and consequently a Dirac point is formed with Dirac conical dispersions in its vicinity. The validity of this approach is demonstrated by three examples. We further show that the Dirac cones of accidental degeneracy have the same properties as the symmetry-induced Dirac cones, such as finite group velocity and pseudo-diffusive transmission. Our finding opens a route for the engineering of accidental degeneracy in general photonic crystals beyond the scope of high-symmetry ones.
    Citation
    Chu, H., Zhang, Y., Luo, J., Xu, C., Xiong, X., Peng, R., … Lai, Y. (2021). Band engineering method to create Dirac cones of accidental degeneracy in general photonic crystals without symmetry. Optics Express, 29(12), 18070. doi:10.1364/oe.427389
    Publisher
    The Optical Society
    Journal
    Optics Express
    DOI
    10.1364/oe.427389
    Additional Links
    https://www.osapublishing.org/abstract.cfm?URI=oe-29-12-18070
    ae974a485f413a2113503eed53cd6c53
    10.1364/oe.427389
    Scopus Count
    Collections
    Articles; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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