Laser Rewritable Dichroics through Reconfigurable Organic Charge‐Transfer Liquid Crystals

Charge‐transfer materials based on the self‐assembly of aromatic donor–acceptor complexes enable a modular organic‐synthetic approach to develop and fine‐tune electronic and optical properties, and thus these material systems stand to impact a wide range of technologies. Through laser‐induction of temperature gradients, in this study, user‐defined patterning of strongly dichroic and piezoelectric organic thin films composed of donor–acceptor columnar liquid crystals is shown. Fine, reversible control over isotropic versus anisotropic regions in thin films is demonstrated, enabling noncontact writing/rewriting of micropolarizers, bar codes, and charge‐transfer based devices.