Hybrid Dispersion Engineering based on Chiral Metamirror. Issue 3 (3rd January 2023)

• Record Type: Journal Article
• Authors: Li, Jinxing; Yuan, Yueyi; Yang, Guohui; Wu, Qun; Zhang, Wei; Burokur, Shah Nawaz; Zhang, Kuang
• Is Part Of: Laser & photonics reviews. Volume 17:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-03
• Subjects: chirality‐assisted phase -- dispersion manipulation -- geometric phase -- hybrid dispersion -- metasurface; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202200777
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: Dispersion is one of the key performances of optical systems. As a man‐made device, metasurface is a notable alternative for dispersion manipulation and has been developed vigorously in recent years. However, the currently reported dispersion manipulation principle of meta‐atoms only relies on controlling the propagation phase in the operation frequency band or several working wavelengths. In this paper, the chirality‐assisted phase is introduced as an additional degree of freedom to engineer the dispersion characteristics of the meta‐atom, and the strategy is theoretically demonstrated. The dispersion characteristic of the chiral meta‐atom working in a reflective manner is discussed in detail within the working bandwidth. Then, two hybrid dispersion‐engineered metamirrors (HDEMs) are proposed and constructed to demonstrate versatile dispersion manipulation in the working frequency band, including achromatic focusing for the lower half band and hyper dispersive focusing for the upper half band, and hyper dispersive focusing and abnormal dispersive focusing in the lower and upper half band, respectively. Both full‐wave simulation and measured performances verify the validity and flexibility of the proposed strategy. This work exploits a new degree of freedom for dispersion manipulation, providing a new approach for dispersion‐engineered metasurfaces design. Abstract : Chirality‐assisted phase is introduced as a new degree of freedom to assist dispersion manipulation more flexibly. As a proof of concept, based on the proposed reflective chiral meta‐atom, two hybrid dispersion‐engineered metamirrors (HDEMs) performing different dispersive focusing within the 8 GHz ‐ 10 GHz and 10 GHz ‐ 12 GHz are proposed and constructed.