Reconfigurable metamaterial for chirality switching and selective intensity modulation

Abstract

A reconfigurable metamaterial for chirality switching and selective intensity modulation is demonstrated experimentally. Through simple folding strategy, nonchiral state, single-band chiral states and dual-bands chiral states can be switched. Circular dichroism up to 0.94 is measured with folding angles of 70°. Meanwhile, selective intensity modulation is realized by the combined effect of folding angle and incident angle. The transmission intensity of circularly polarized waves can be modulated by more than 90% at any selected resonating frequency between 8.97 and 10.73 GHz. This work will benefit the researches of foldable metamaterials and have potential applications in the field of reconfigurable devices.

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

“…[1][2][3][4] Origami-and kirigami-based structures are considered to possess huge potentials to realize functionality integration or switching without tough external excitations, including heat, voltage, and active elements. [5][6][7] With the rapid development of artificial materials, the two-dimensional (2D) counterparts of metamaterialsmetasurfaces, have become hot topics in the past few decades. [8] This kind of ultrathin periodic arrays can produce field discontinuities within deep subwavelength scale, which are regarded as the powerful tools to guide electromagnetic waves.…”

“…[ 1–4 ] Origami‐ and kirigami‐based structures are considered to possess huge potentials to realize functionality integration or switching without tough external excitations, including heat, voltage, and active elements. [ 5–7 ]…”

“…[40] The strategies of changing oblique angle of meta-resonators by origami technique are attempted to manipulate absorption or circular dichroism. [7,41,42] In this way, the foldable substrate supporters are applied to construct 3D structure in a dynamic manner. Resorting kirigami-based method, the chiral hollow-out can be obtained at golden sheet in nanoscale.…”

Recoverable Broadband Absorption Based on Ultra-Flexible Meta-Surfaces

“…Remarkably, Li et al, demonstrated experimentally a reconfigurable metamaterial for chirality switching and selective intensity modulation. It could be achieved by switching among non-chiral, single-band-chiral, and dual-band-chiral states by a simple folding strategy [42]. It can be noted that, in the latest literature, the tunable/recoverable broadband absorption of MPAs has concentrated mostly on external activation where wide absorption bandwidth, low cost, and ability to construct simple structures without masks are still the challenges; moreover, another limitation is apparent from this experimental confirmation and that is the difficulty of measuring at different modulations owing to the complicated and/or expensive techniques for broadband MPAs.…”

High Circular Dichroism in Extrinsic Chiral Metamaterials Based on Sawtooth and Zigzag Arrangements With Experimental Validation

“…This work shows absorption and broadband cross-polarization conversion greater than 90%. The folding strategy was also discussed in [24], wherein CD up to 0.94 is measured with folding angles of 70 • . In [25], split-ring resonators (SRRs) were distributed in an origamibased 3-D structure to provide, with a folding angle of 45 • , a CD of up to 0.6.…”