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Utilizing continues-wave or pulsed laser to induce nano-structures on variousmaterial surfaces is one significant method in nano-fabrication technology. Inthis report, we investigate the formation of high spatial frequency periodicstructures on Polyvinyl Pyrrolidone (PVP) film by a linearly polarizedfemtosecond laser. Ferric (Fe) ions are introduced into the film to improve thephotosensitivity. Regular nano-gratings with spatial periods at the range of60-100nm, which are about one tenth of the irradiating wavelength, can beinduced. The period direction of the nano-gratings is perpendicular to thepolarization of the femtosecond laser. By tuning the laser energy and scanningspeed, we find that the nano-gratings can be formed in a wide range ofexperimental parameters. As high laser energy can excite not only metals, butalso semiconductors and polymers, we believe the formation of the nano-gratingsis due to the interaction between the incident femtosecond laser and surfaceplasmons. The laser processable PVP-based materials and the inducednano-gratings will have potential applications in biophotonics andnanophotonics.

High spatial frequency periodic structures induced on ferric ion-doped Polyvinyl Pyrrolidone film by femtosecond laser pulses