Chiral-magic angle of nanoimprint meta-device

Abstract

The magic angle of Twistronics has attracted a lot of attention because of its peculiar electrical characteristics. Moiré patterns formed by the superlattice of a twisted bilayer change overall physical properties. Circular dichroism can also be manipulated through the generated moiré pattern. Here, we report a polymer-based twisted bilayer meta-device fabricated by multilayer nanoimprint technology and study the magic angle of chirality. The superlattice of the bilayer meta-device creates moiré patterns and brings unique chiral optical responses. The bilayer nanoimprint technology is developed for metasurfaces with relative twist angles. Via the twist angle control, polymer materials with a low refractive index can manipulate the electric field of the light and reveal the chiral magic angle. Moreover, the shape of the meta-atoms plays a key role in chiral magic angle tuning. The chirality engineering by the reported nanoimprint technology and chiral meta-devices may contribute to applications in chiral imaging, biomedical sensing, lasing, and tunable optical devices.

Meta-device: advanced manufacturing

“…6b. The same idea for refractive index increasing in resin also applies to the visible spectrum, where TiO 2 nanoparticles are mixed with resin 84 .…”

Holographic Fabrication of 3D Moiré Photonic Crystals Using Circularly Polarized Laser Beams and a Spatial Light Modulator

“…Manipulating the twist angle between the two layers of 2D materials has resulted in a fine control of the electronic band structure [ 37 ], magic-angle flat-band superconductivity [ 38 ], the formation of moiré excitons [ 39 ], interlayer magnetism [ 40 , 41 ], topological edge states [ 42 ], and correlated insulator phases [ 43 ]. Twisted moiré photonic crystal is an optical analog of twisted 2D materials, with significant interest triggered by the discovery of flat photonic bands in moiré photonic crystal [ 44 , 45 , 46 , 47 , 48 , 49 ]. A 3D moiré photonic crystal is a new nano-/microstructure that distinguishes itself from the bilayer twisted photonic crystals.…”

Plasmonic color filter with nanoring aperture array

“…Since the processing methods of nanometal structures have become widely used, more and more metal nanostructures can be processed, and their extraordinary optical transmission effect is getting stronger and stronger. 1 Plasmonic color filters have widely been concerned and developed. 2,3 Scholars have studied many nanostructures, metal-insulator-metal structures, [4][5][6] nanocolumns, [7][8][9][10][11] nanoholes, [12][13][14] nanoslits, 15 and nanorings.…”

“…Since the processing methods of nanometal structures have become widely used, more and more metal nanostructures can be processed, and their extraordinary optical transmission effect is getting stronger and stronger 1 . Plasmonic color filters have widely been concerned and developed 2 , 3 .…”