Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs
作者机构：Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Electrical and Computer EngineeringNational University of SingaporeSingapore 117583Singapore Institute of Precision Optical EngineeringSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Key Laboratory of Multifunctional Nanomaterials and Smart SystemsSuzhou institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2023年第12卷第4期
页 面：542-550页
核心收录：
学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0701[理学-数学] 0702[理学-物理学]
基 金：support from the National Natural Science Foundation of China(no.12204264) the Shenzhen Stability Support Program(no.WDZC20220810152404001) the Cross-Disciplinary Research Fund of Tsinghua Shenzhen International Graduate School(SIGS),Tsinghua University(JC2022001),and the startup funding in Tsinghua Shenzhen International Graduate School(SIGS),Tsinghua University(no.01030100006) support from the National Natural Science Foundation of China(No.62205246) the Fundamental Research Funds for the Central Universities.C-W.Q.acknowledges financial support from the NRF,Prime Minister's Office,Singapore under the Competitive Research Program Award(NRF-CRP26-2021-0063)
主 题：Poincaré polarized twisted
摘 要：Arbitrary polarized vortex beam induced by polarization singularity offers a new platform for both classical optics and quantum entanglement *** states in the continuum(BICs)have been demonstrated to be associated with topological charge and vortex polarization singularities in momentum *** conventional symmetric photonic crystal slabs(PhCSs),BIC is enclosed by linearly polarized far fields with winding angle of 2π,which is unfavorable for high-capacity and multi-functionality integration-optics ***,we show that by breakingσz-symmetry of the PhCS,asymmetry in upward and downward directions and arbitrarily polarized BIC can be realized with a bilayer-twisted *** exhibits elliptical polarization states with constant ellipticity angle at every point in momentum space within the vicinity of *** topological nature of BIC reflects on the orientation angle of polarization state,with a topological charge of 1 for any value of ellipticity *** coverage of Poincarésphere(i.e.,-π/4≤X≤4 and-π/2≤ψ≤π/2)and higher-order Poincarésphere can be realized by tailoring the twist *** findings may open up new avenues for applications in structured light,quantum optics,and twistronics for photons.
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