Wang, DanfengDanfengWangWang, YuqiYuqiWangQian, ZhenghuaZhenghuaQianTachi, TomohiroTomohiroTachiKUO-CHIH CHUANG2025-09-242025-09-242021https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116046429&doi=10.1016%2Fj.physleta.2021.127701&partnerID=40&md5=e90f1233ce5b2bdb6eb83ff7634b0a08https://scholars.lib.ntu.edu.tw/handle/123456789/732379As an art of paper folding, origami has inspired designs of diverse tailorable mechanical structures within physics and engineering communities. In this letter, by introducing a unilateral gradient on the Miura-ori crease pattern, we realize a gradient-index (GRIN) origami phononic crystal (PC) lens. The width distribution of a pair of adjacent panels is designed to allow the graded Miura-ori PC lens to have a refractive index variation highest at the center axis and a hyperbolic secant gradient distribution along a direction transverse to the direction of the Lamb wave propagation. The folding angle-dependent gradient refractive index distribution gradually bends and focuses the incident waves at different frequencies toward the center axis. Both numerical modeling and experimental verification are conducted to validate the focusing of the plane wave on the graded Miura-ori PC lens.Lamb WavesMetamaterialsOrigamiPhononic Crystal (pc) LensWaveguidesCrystalsPhononsRefractive IndexUltrasonic WavesWave PropagationCrystal LensEngineering CommunityGradient-indexMechanical StructuresOrigamiPaper FoldingPhononic CrystalPhononic Crystal LensPhysics CommunityRefractive Index VariationsSurface Waves[SDGs]SDG11journal article10.1016/j.physleta.2021.1277012-s2.0-85116046429