Zhuolin Shi, Jinglin He, Jinjin Wang, Hanru Shao, Jianfeng Dong. Design of tunable circular dichroism extrinsic chiral metasurface based on phase change material GST[J]. Opto-Electronic Engineering, 2022, 49(10): 220092
- Opto-Electronic Engineering
- Vol. 49, Issue 10, 220092 (2022)
Fig. 1. Schematic diagram of the designed extrinsic chiral metasurface structure array and its unit cell structure. (a) The principle of extrinsic chirality and the direction of oblique incidence; (b) Unit cell structure; (c) The specific structural parameters
![(a) Dielectric constants of amorphous and crystalline GST [27-28]; (b) Sketch of phase transitions between crystalline and amorphous phases of GST[8]](/richHtml/gdgc/2022/49/10/220092/220092-2.jpg)
Fig. 2. (a) Dielectric constants of amorphous and crystalline GST [27-28]; (b) Sketch of phase transitions between crystalline and amorphous phases of GST[8]
Fig. 3. Transmission coefficients for (a) crystalline and (b) amorphous states of GST
Fig. 4. The CD spectra for amorphous and crystalline states of GST at θ = 50° and φ = 0°
Fig. 5. The curve of CD parameters with different incidence angles θ in GST (a) amorphous and (b) crystalline states when φ = 0°; The curve of CD parameters with different incidence projection angles φ in GST (c) amorphous and (d) crystalline states when θ = 50°
Fig. 6. The CD spectra with different (a) period p and (b) thickness t in the amorphous state of GST layer
Fig. 7. Electric field distribution when θ = 0°，φ = 0°. (a) Crystalline GST, LCP incidence, f =130 THz; (b) Crystalline GST, RCP incidence, f =130 THz; (c) Amorphous GST, LCP incidence, f = 200 THz; (d) Amorphous GST, RCP incidence, f = 200 THz
Fig. 8. Electric field distribution when θ = 50°，φ = 0°. (a) Crystalline GST, LCP incidence, f =130 THz; (b) Crystalline GST, RCP incidence, f =130 THz; (c) Amorphous GST, LCP incidence, f = 200 THz; (d) Amorphous GST, RCP incidence, f = 200 THz
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