Transformation from 2D meta-pixel to 3D meta -pixel using auxetic kirigami for programmable multifunctional electromagnetic response

Implementation of multiple functions on the metamaterials can greatly broaden their potential application. Origami-based metamaterials, whose buck properties can be manipulated by tuning the specific folding angle, have currently become a supplemental method for conventional reconfigurable metadevices. Approaching kirigami with transformable features and idea of a functional metastructure, this paper numerically and experimentally investigates a multifunctional electromagnetic response with mechanically programmable characteristic based on an auxetic kirigami pattern in gigahertz frequency regime. The metamaterial unit cell has 2-dimensional (2D) five meta pixels. Each 2D meta-pixel can be transformed to the 3-dimensional (3D) meta-pixel and it is coded by ternary number (-1, 0, +1) for different folding levels. The kirigami pattern provides five transformable tessellations corresponding to five distinct functions of electromagnetic reflector, band-pass filter and polarization-selectable absorbers. The performance of the proposed programmable multifunctional metamaterial is numerically and experimentally demonstrated. This study can motivate the realization of kirigami computing, code-driven multifunctional metastructures. (c) 2020 Elsevier Ltd. All rights reserved.