High nonlinear optical anisotropy of urea nanofibers
University of Minho, Center of Physics, Campus de Gualtar - 4710-057 Braga, Portugal, EU
2 3B's Research Group – Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho - AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806-909 Caldas das Taipas, Guimarães, Portugal, EU
Accepted: 18 July 2010
Nanofibers consisting of the optically nonlinear organic molecule urea embedded in both poly(ethylene oxide) (PEO) and poly(vinyl alcohol) (PVA) polymers were produced by the electrospinning technique. The second-harmonic generation produced by aligned fiber mats of these materials displays a strong dependence on the polarization of the incident light. In PVA-urea nanofibers the effectiveness in generating of the second-harmonic light is as high as that of a pure urea powder with an average grain size of 110 μm. The results suggest that single crystalline urea nanofibers were achieved with a long-range crystalline order extending into the range of 2–4 μm with PVA as the host polymer.
PACS: 81.07.-b – Nanoscale materials and structures: fabrication and characterization / 68.35.bm – Polymers, organics / 42.79.Nv – Optical frequency converters
© EPLA, 2010