Fig. 1: Schematic of the proposed reconfigurable kirigami metasurface.
From: Abnormal beam steering with kirigami reconfigurable metasurfaces
a Conventional mechanically reconfigurable metasurfaces that adjust the angle of anomalous reflection beam by changing the lattice constants Px and Py through substrate deformation. b Proposed mechanically reconfigurable metasurfaces that can synchronously adjust the three DoFs of the meta-atoms: Px, Py and φ, achieving significantly extended tuning angle range of reflection beam. c Schematics of the adopted RS kirigami pattern composed of rigid square panel connected at the corner. During the global mechanical transformation, the blue squares rotate CCW while the red squares rotate CW. The emojis, representing arbitrary meta-atoms, rotate along with the panels. β is defined as the rotation angle of the panels, and the geometric phase variation of each meta-atom is Δφ = ±2σβ depending on its rotation direction (CW or CCW) and polarization state of illuminated light (\(\sigma=+ 1\): LCP; \(\sigma=-1\): RCP). \({P}_{{{{\rm{x}}}}}^{\beta }\), \({P}_{{{{\rm{y}}}}}^{\beta }\), and \({P}_{{{{\rm{\rho }}}}}^{\beta }\) are the lattice constants in different transformation states along x, y and ρ direction, respectively. The emoji image is reproduced from openmoji.org under the CC BY-SA 4.0 license.
