Xu, ZhulongZhulongXuYu, Shi BoShi BoYuLiu, JunjieJunjieLiuKUO-CHIH CHUANG2025-09-242025-09-242022https://www.scopus.com/inward/record.uri?eid=2-s2.0-85138004304&doi=10.3390%2Fcryst12081170&partnerID=40&md5=5fd37ba4ecd0b5406764f560044b57e5https://scholars.lib.ntu.edu.tw/handle/123456789/732375In this paper, inspired by origami structures, we offer a very simple tuning method to overcome the limitations of general elastic metasurfaces, where only a certain functionality at a certain frequency range can be achieved, by designing a reflective metasurface based on foldable/deployable zig-zag structures. By utilizing peg/screw connections, the folding angles of the zig-zag structures can be easily tuned while also being fixable. By tuning the folding angle, the subunit of the zig-zag metasurface can cover a 2π phase shift span and the phase shift can be tuned continuously, and almost linearly, with respect to the folding angle. With a simple folding motion, the tunable reflective metasurface can steer reflected flexural waves in different directions and focus-reflected flexural waves with different focal distances. In addition to demonstrating tunable performance, the mechanism that associates the changing speed of the phase shift is explained. The proposed tunable zig-zag elastic metasurface provides a new way to design reconfigurable metamaterials/metasurfaces.FocusingSteeringTunable MetasurfacesZig-zag Structures[SDGs]SDG11journal article10.3390/cryst120811702-s2.0-85138004304