2016/02/28 by Lai, Chen, Guocai Liao, Yunxia Wang +6
Engineering · Medicine · #FOS: Physical sciences #Laser Material Processing Techniques #Laser-induced spectroscopy and plasma #Ocular and Laser Science Research #Optics (physics.optics)
paper · pdf · doi:10.48550/arxiv.1602.08685
openalex publication_date 2016/02/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Utilizing continues-wave or pulsed laser to induce nano-structures on various material surfaces is one significant method in nano-fabrication technology. In this report, we investigate the formation of high spatial frequency periodic structures on Polyvinyl Pyrrolidone (PVP) film by a linearly polarized femtosecond laser. Ferric (Fe) ions are introduced into the film to improve the photosensitivity. Regular nano-gratings with spatial periods at the range of 60-100nm, which are about one tenth of the irradiating wavelength, can be induced. The period direction of the nano-gratings is perpendicular to the polarization of the femtosecond laser. By tuning the laser energy and scanning speed, we find that the nano-gratings can be formed in a wide range of experimental parameters. As high laser energy can excite not only metals, but also semiconductors and polymers, we believe the formation of the nano-gratings is due to the interaction between the incident femtosecond laser and surface plasmons. The laser processable PVP-based materials and the induced nano-gratings will have potential applications in biophotonics and nanophotonics.