Plasmon‐Assisted Nanopoling of Poly(Vinyl Difluoride) Films

Abstract Plasmonic nanoheating can be utilized to induce nanophase transformation, which has important implications for nano‐optoelectronics, nano‐piezoelectronics, and high‐density data storage. Herein, optical poling of poly(vinyl difluoride) (PVDF) is shown with the assistance of surface plasmons. The ultrathin PVDF films are sandwiched between gold nanoparticles (Au NPs) and a gold film. By irradiating the Au NPs with continuous‐wave laser, nanoannealing of the PVDF films is realized, which locally transforms the PVDF from α phase to β phase as evidenced by Raman spectroscopy. This nanophase transformation is reproducible and scalable by scanning laser across the Au NP films deposited on the PVDF. In such a way, arbitrary patterns of β phases can be generated, which can potentially be applied for integrated piezoelectronic devices, high‐density data storage, and anti‐counterfeiting.