Evolution of polarization singularities accompanied by avoided crossing in plasmonic system |
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Affiliation: | 1.Chongqing University, Chongqing 400044, China;2.School of Science, Southwest University of Science and Technology, Mianyang 621010, China;3.Chongqing Key Laboratory of Core Optoelectronic Devices for Quantum Communication, Chongqing Optoelectronics Research Institute, Chongqing 400060, China |
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Abstract: | The evolution of polarization singularities supported in a one-dimensional periodic plasmonic system is studied. The lateral inversion symmetry of the system, which breaks the in-plane inversion symmetry and up-down mirror symmetry simultaneously, yields abundant polarization states. A complete evolution process with geometry for the polarization states is traced. In the evolution, circularly polarized points (C points) can stem from 3 different processes. In addition to the previously reported processes occurring in an isolated band, a new type of C point appearing in two bands simultaneously due to the avoided band crossing, is observed. Unlike the dielectric system with a similar structure which only supports at-$varGamma$ bound states in the continuum (BICs), accidental BICs off the $varGamma$ point are realized in this plasmonic system. This work provides a new scheme of polarization manipulation for the plasmonic systems. |
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Keywords: | polarization singularities topological charge avoided crossing inversion symmetry |
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