Photonics Research, Volume. 9, Issue 12, 2435(2021)
Unconventional Weyl exceptional contours in non-Hermitian photonic continua
Fig. 1. Unconventional Weyl exceptional contours in non-Hermitian anisotropic chiral plasma, parameterized by the in-plane permittivity. When the contour splits or not, the space is divided into the red part, the gray part, and the boundary in between, corresponding to the QWERs, two separated WERs, and the WECs. Underlined are three special cases that pinned in planes by pseudo-PT symmetries: in-plane QWERs, type I WECs with a single chain point, and type II WECs with two chain points.
Fig. 2. Quadratic Weyl point in Hermitian anisotropic chiral plasma. (a) Isofrequency contour at the plasma frequency in the
Fig. 3. Four typical cases evolving from the QWP. (a) Two WPs, where
Fig. 4. Metamaterial designs to implement various unconventional Weyl exceptional contours. (a) Unit cell of metamaterial. The metallic structure (in gray) is designed to create in-plane resonance to introduce chirality. By switching the in-plane permittivity of the background material to
Fig. 5. Evolution of Berry phases on the latitude circles of the spheres enclosing (a) QWP, (b) QWER, (c) type II WEC, and (d) type I WEC. As the polar angle varies from 0 to
Fig. 6.
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Qinghui Yan, Qiaolu Chen, Li Zhang, Rui Xi, Hongsheng Chen, Yihao Yang. Unconventional Weyl exceptional contours in non-Hermitian photonic continua[J]. Photonics Research, 2021, 9(12): 2435
Category: Physical Optics
Received: Jul. 29, 2021
Accepted: Sep. 14, 2021
Published Online: Nov. 15, 2021
The Author Email: Hongsheng Chen (hansomchen@zju.edu.cn), Yihao Yang (yangyihao@zju.edu.cn)