Merging and separation of polarization singularities in complex lattices

doi:10.1088/1674-1056/ada9da

中国物理B ›› 2025, Vol. 34 ›› Issue (3): 37303-037303.doi: 10.1088/1674-1056/ada9da

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

收稿日期:2024-11-01 修回日期:2024-12-23 接受日期:2025-01-14 发布日期:2025-03-15
通讯作者: Peng Liu, Liangsheng Li, Ning Zheng E-mail:liupeng@bit.edu.cn;liliangshengbititp@163.com;ningzheng@bit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 12374205).

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

Received:2024-11-01 Revised:2024-12-23 Accepted:2025-01-14 Published:2025-03-15
Contact: Peng Liu, Liangsheng Li, Ning Zheng E-mail:liupeng@bit.edu.cn;liliangshengbititp@163.com;ningzheng@bit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 12374205).

摘要/Abstract

摘要： 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-$\varGamma$ BIC can generate new BICs or CPSs. At an off-$\varGamma$ point, a BIC can spawn from the collision of two CPSs. As the thickness of the structure increases, this BIC will meet the at-$\varGamma$ BIC. The merging of BICs can induce topological charge transition and yield a large wavevector space around the $\varGamma$ point with ultra-high quality ($Q$) factors. Our findings provide a novel degree of freedom for manipulating polarization singularities, which holds great promise in radiation modulation and singular optics.

关键词: bound states in the continuum, circularly polarized states, topological charge, far-field polarization, photonic crystals

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-$\varGamma$ BIC can generate new BICs or CPSs. At an off-$\varGamma$ point, a BIC can spawn from the collision of two CPSs. As the thickness of the structure increases, this BIC will meet the at-$\varGamma$ BIC. The merging of BICs can induce topological charge transition and yield a large wavevector space around the $\varGamma$ point with ultra-high quality ($Q$) factors. Our findings provide a novel degree of freedom for manipulating polarization singularities, which holds great promise in radiation modulation and singular optics.

Key words: bound states in the continuum, circularly polarized states, topological charge, far-field polarization, photonic crystals

中图分类号: (Surface states, band structure, electron density of states)

73.20.At

78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)

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[J]. 中国物理B, 2025, 34(3): 37303-037303.

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Merging and separation of polarization singularities in complex lattices

Merging and separation of polarization singularities in complex lattices

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