Photonics Research, Volume. 12, Issue 12, 2863(2024)
Manifestation of super chiral exceptional points in a plasmonic metasurface
Fig. 1. Design and characteristics of PT-symmetric metasurface. (a) Schematic of PT-symmetric metasurface composed of orthogonal oriented sliver nanorods with local gain. Typical parameters:
Fig. 2. PT-symmetric phase transition and SCEP. (a)–(f) Chiral-component transmission spectra and total chiral transmission spectra of the system (a), (d) in PT-symmetric phase, (b), (e) at SCEP, and (c), (f) in PT-symmetry broken phase. The Rabi splitting, resulting from strong coupling of orthogonally oriented nanorods, is clearly observed in PT-symmetric phase. At SCEP, the circular components
Fig. 3. Unidirectional invisibility and polarization converter. (a) Schematic of unidirectional invisibility at SCEP, where only one chiral component can transmit through the metasurface. (b) Total transmission spectra for circularly polarized incident light, (c) transmission spectra for RCP and LCP components, and (d) amplitude and phase difference of transmitted electric fields for backward incidence (
Fig. 4. Generation of arbitrary polarization states on the Poincaré surface under an LP beam incident on metasurfaces. (a) Polarization states of the transmitted light for different values of
Fig. 5. Left-handed SCEP with fixed gap
Fig. 6. Transmission spectra of metasurfaces without gain–loss difference. (a)–(c) Chiral-total transmission spectra and (b)–(d) chiral-component transmission spectra of the system with different gap
Fig. 7. Numerical calculation results of LP incidence with varying
Fig. 8. The transmission polarization can be extended from the Poincaré sphere meridian to the entire surface by rotating the metasurface unit cell. (a) Transmission polarization states are plotted on the Poincaré surface at 1398 nm (take the transmission polarization axes along 30° and 120° as examples).
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Haojie Li, Guoxia Yang, Anwen Jiang, Min Ni, Qianwen Jia, Fengzhao Cao, Jiayi Zhang, Bokun Lyu, Dahe Liu, Jinwei Shi, "Manifestation of super chiral exceptional points in a plasmonic metasurface," Photonics Res. 12, 2863 (2024)
Category: Surface Optics and Plasmonics
Received: Jul. 26, 2024
Accepted: Oct. 3, 2024
Published Online: Nov. 27, 2024
The Author Email: Jinwei Shi (shijinwei@bnu.edu.cn)
CSTR:32188.14.PRJ.537395