Merging and separation of polarization singularities in complex lattices
Mengyao Wang(王梦瑶)1,2, Tian Shi(石天)3, Luhui Ning(宁鲁慧)4,5, Peng Liu(刘鹏)1,†, Liangsheng Li(李粮生)2,‡, and Ning Zheng(郑宁)1,§
1 School of Physics, Beijing Institute of Technology, Beijing 100081, China; 2 National Key Laboratory of Scattering and Radiation, Beijing 100854, China; 3 Army Engineering University of PLA Shijiazhuang Campus, Shijiazhuang 050003, China; 4 Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, College of Science, China University of Petroleum-Beijing, Beijing 102249, China; 5 Basic Research Center for Energy Interdisciplinary, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
Abstract The evolution in momentum space of bound states in the continuum (BICs) and circularly polarized states (CPSs) - as far-field polarization singularities - can be observed by controlling the geometric parameters of photonic crystals. This offers significant potential in optics and photonics. Here, we reveal that in complex lattices far-field polarization singularities can be flexibly manipulated while preserving structural symmetry. A change in topological charge for the at- BIC can generate new BICs or CPSs. At an off- point, a BIC can spawn from the collision of two CPSs. As the thickness of the structure increases, this BIC will meet the at- BIC. The merging of BICs can induce topological charge transition and yield a large wavevector space around the point with ultra-high quality () factors. Our findings provide a novel degree of freedom for manipulating polarization singularities, which holds great promise in radiation modulation and singular optics.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12374205).
Corresponding Authors:
Peng Liu, Liangsheng Li, Ning Zheng
E-mail: liupeng@bit.edu.cn;liliangshengbititp@163.com;ningzheng@bit.edu.cn
Cite this article:
Mengyao Wang(王梦瑶), Tian Shi(石天), Luhui Ning(宁鲁慧), Peng Liu(刘鹏), Liangsheng Li(李粮生), and Ning Zheng(郑宁) Merging and separation of polarization singularities in complex lattices 2025 Chin. Phys. B 34 037303
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