Flexible, Programmable, Chiroptical Polymer Films of Twisted Stacking Layers for Circular Polarization‐Based Multiplex Color Display

Abstract

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

“…Importantly, the authors established that the CD spectra of red-blue heterobilayer resembled those of blue-blue homobilayer; similarly, the CD spectra of blue-red heterobilayer resembled those of red-red homobilayer. [42] This study brings forth key insights into the role of the top layer in a chiral bilayer metasurface.…”

“…Langmuir-Schaeffer assembly, [15,76] grazing incidence spraying, [17,77] gravity-assisted alignment, [42] and templateassisted colloidal assembly [16] have been employed to prepare monolayers in chiral twisted metamaterials. In particular, due to the well-established synthesis protocols for plasmonic nanostructures and plasmon-enhanced light-matter interactions, numerous recent works have investigated chiral plasmonic metasurfaces based on orientationally aligned gold or silver nanorods or nanowires.…”

“…Gravitational forces were leveraged to align polydiacetylene fibers during topological solid-state polymerization. [42] The excellent alignment in nanofibrils and microscale fibers was ascertained using atomic force microscopy and polarized optical microscopy, respectively. Lastly, nanowires selfassembled from nanoparticles are alternative candidates.…”

“…Similar realizations have been reported for twisted nanostructures of other 2D materials such as transition metal dichalcogenides, [38,39] graphitic carbon nitride, [40] and hexagonal boron nitride (hBN), [41] as well as non-2D systems like polymeric thin films or patterned plasmonic nanohole arrays. [42,43] Therefore, there exists fertile ground for chiral metasurface design Artificial chiral nanostructures have been subjected to extensive research for their unique chiroptical activities. Planarized chiral films of ultrathin thicknesses are in particular demand for easy on-chip integration and improved energy efficiency as polarization-sensitive metadevices.…”

Mechano-tunable circularly polarized luminescence of flexible nanocomposite films

“…17,18 The introduction of chiral nanostructures into stimuli-responsive materials is expected to induce novel switchable chiroptical properties including circularly polarized luminescence (CPL) performance and endow them with tremendous potential for a wide variety of applications in chiral templating, encryption and information storage and optical display. [19][20][21] Conventional strategies to directly synthesize CPL materials, including connecting chiral moieties to fluorophores through covalent or noncovalent bonding, 22 based on helical and twisted supramolecular systems 23 and cholesteric liquid-crystalline mesophases, 24 have been well developed. But their synthetic routes are usually complicated, and the chiral-transfer process is usually difficult to achieve, limiting their practical applications.…”