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Many promising approaches for designing interactions of synthetic materialswith light involve solid optical monocrystals and nanofabricated photoniccrystal structures with spatially periodic variations of refractive index.Although their high costs limit current technological applications, remarkably,such photonic and optically anisotropic materials have also evolved throughoutnature and enable narrow or broad-band spectral reflection of light. Here weuse self-assembly of biomaterial cellulose nanocrystals to obtain three-layerfilms with helicoidal and nematic-like organization of the cellulosenanoparticles, which mimics naturally occurring polarization-insensitivereflectors found in the wings of Plusiotis resplendens beetles. These filmswere characterized with polarized optical microscopy and circular dichroismspectrometry, as well as scanning and transmission electron microscopies. Thesefilms exhibit high reflectivity tunable within the visible and near-infraredregions of the optical spectrum and may find applications ranging from colorfilters to smart cloth designs and in solar-gain-regulating buildingtechnologies.

Cellulose-Based Reflective Liquid Crystal Films as Optical Filters and Solar Gain Regulators