Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs

Haoye Qin; Zengping Su; Mengqi Liu; Yixuan Zeng; Man-Chung Tang; Mengyao Li; Yuzhi Shi; Wei Huang; Cheng-Wei Qiu; Qinghua Song

doi:10.1038/s41377-023-01090-w

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Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs

Original Articles

- Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs
- Light: Science & Applications Vol. 12, Issue 4, Pages: 542-550(2023)
- Affiliations：
  
  1.Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
  2.Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
  3.Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
  4.Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou 215123, China
- Author bio：
  
  Cheng-Wei Qiu (chengwei.qiu@nus.edu.sg)
  Qinghua Song (song.qinghua@sz.tsinghua.edu.cn)
- Funds：
- DOI：10.1038/s41377-023-01090-w
  CLC：
- Published：30 April 2023，
  
  Published Online：7 March 2023，
  
  Received：14 August 2022，
  
  Revised：30 December 2022，
  
  Accepted：1 February 2023
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Qin, H. Y.et al. Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs.Light: Science & Applications,12, 542-550 (2023).
DOI：

Qin, H. Y.et al. Arbitrarily polarized bound states in the continuum with twisted photonic crystal slabs.Light: Science & Applications,12, 542-550 (2023). DOI： 10.1038/s41377-023-01090-w.

摘要

Abstract

Arbitrary polarized vortex beam induced by polarization singularity offers a new platform for both classical optics and quantum entanglement applications. Bound states in the continuum (BICs) have been demonstrated to be associated with topological charge and vortex polarization singularities in momentum space. For conventional symmetric photonic crystal slabs (PhCSs)

BIC is enclosed by linearly polarized far fields with winding angle of 2

which is unfavorable for high-capacity and multi-functionality integration-optics applications. Here

we show that by breaking

-symmetry of the PhCS

asymmetry in upward and downward directions and arbitrarily polarized BIC can be realized with a bilayer-twisted PhCS. It exhibits elliptical polarization states with constant ellipticity angle at every point in momentum space within the vicinity of BIC. The topological nature of BIC reflects on the orientation angle of polarization state

with a topological charge of 1 for any value of ellipticity angle. Full coverage of Poincaré sphere (i.e.

$$- {{\pi \over 4}} \le \chi \le {{\pi \over 4}}$$

and

$$- {{\pi \over 2}} \le \psi \le {{\pi \over 2}}$$

) and higher-order Poincaré sphere can be realized by tailoring the twist angles. Our findings may open up new avenues for applications in structured light

quantum optics

and twistronics for photons.

关键词

Keywords

references

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