Origami–Kirigami Arts: Achieving Circular Dichroism by Flexible Meta‐Film for Electromagnetic Information Encryption

Abstract

Both origami and kirigami arts, the strategies of mechanically affording versatile and unconventional structural transformation, have attracted huge attention in the fields of physics and material science. With the assistance of meta‐devices, origami and kirigami techniques are gradually applied to guide electromagnetic waves yet the exploration on this academic issue is still in infancy. Here, a general paradigm that inspired by origami–kirigami arts is proposed to fit the Rosenfeld principle‐based chiroptical effect. The L‐ and D‐enantiomers are implemented to tailor the aperture distribution of a fabricated meta‐film. By properly folding the meta‐film, the holographic images can be reconstructed at designated focal planes when driven by spin angular momenta for distinct frequency bands. Owing to the characteristics of flexibility and foldability, the fabricated meta‐film can be easily applied to carry and deploy, which may bring up another route for spin selective systems, camouflage, and information encryption.

Chirality‐Switching and Reconfigurable Spin‐Selective Wavefront by Origami Deformation Metasurface

“…Recently, an attempt to realize kirigami multifunctional chiral meta-devices is proposed for designing a chirality-induced EM meta-hologram with information encryption characteristics. [35] However, such meta-hologram is based on amplitude encoding that may limit manipulation freedom compared to phase encoding. [2,5,8] Therefore, it remains challenging to achieve multifunctional chiral metasurfaces that enable wavefront manipulation through phase encoding.…”

Controllable Wrinkling Inspired Multifunctional Metamaterial for Near‐Field and Holographic Displays

“…[4] To further extend the applicability of EM metamaterials, amplitude-and phase-gradient designs are proposed to manipulate the amplitude and phase distribution in the free space according to the desired functionality. The amplitude-gradient functionalities are often limited to the near-field imaging and the hologram, [5][6][7] while phase-gradient metamaterials have triggered multifarious representative functionalities such as focusing, [8] hologram, [9] artificial neural network, [10] vortex generation, [11] etc. Nevertheless, these passive metamaterials cannot be changed once fabricated, which makes them contradictory to the development trends of functional metamaterial integration and miniaturization.…”