Infrared-laser-induced periodic surface structure in azo-dye polymer

Ivanov, Mario; Rochon, Paul
May 2004
Applied Physics Letters;5/31/2004, Vol. 84 Issue 22, p4511
Academic Journal
Second-harmonic and third-harmonic waves that are generated in an azo-polymer form diffraction patterns without any material deformation. The source is a single IR laser beam at λ=1064 nm that is weakly absorbed by the polymer. If the IR power is sufficiently high, laser-induced periodic (700 nm) structures grow on the polymer surface and give rise to distinctive diffraction patterns in the visible and ultraviolet. If the IR power is low, there are no surface changes but diffraction patterns that have the same shape still appear. © 2004 American Institute of Physics.


Related Articles

  • Photorefractive polymer composite operating at the optical communication wavelength of 1550 nm. Tay, Savaş; Thomas, Jayan; Eralp, Muhsin; Guoqiang Li; Kippelen, Bernard; Marder, Seth R.; Meredith, Gerald; Schülzgen, Axel; Peyghambarian, N. // Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4561 

    A photorefractive polymer composite sensitized at 1550 nm through direct two-photon absorption has been developed. We show an external diffraction efficiency of 3% in four-wave-mixing experiments and perform holographic reconstruction of distorted images utilizing thin-film devices made of this...

  • LIGHT TRAVELS MORE SLOWLY THROUGH STRONGLY SCATTERING MATERIALS. Levi, Barbara Goss // Physics Today;Jun91, Vol. 44 Issue 6, p17 

    This article discusses an experiment which indicates that light may travel more slowly through strongly scattering material than previously believed. We expect light to travel through a medium at a rate given by the speed of light in a vacuum divided by the average index of refraction of the...

  • Small-angle light scattering from polymer-dispersed liquid-crystal films. Loiko, V. A.; Maschke, U.; Zyryanov, V. Ya.; Konkolovich, A. V.; Misckevich, A. A. // Journal of Experimental & Theoretical Physics;Oct2008, Vol. 107 Issue 4, p692 

    A method is developed for modeling and computing the angular distribution of light scattered forward from a single-layer polymer-dispersed liquid-crystal (PDLC) film. The method is based on effective-medium approximation, anomalous diffraction approximation, and far-field single-scattering...

  • Tunable Photonic Stop Gaps in Visible Wavelength Region. Nair, Rajesh V.; Jagatap, B. N. // AIP Conference Proceedings;10/20/2011, Vol. 1391 Issue 1, p68 

    We report the experimental demonstration of tunable stop gap in the visible wavelength region by changing the angle of incidence of light. The width and peak reflectance of the stop gap do not change till an angle of incidence of 45°. For angle of incidence greater than 45°, new...

  • Field-Flow Fractionation With Multiangle Light Scattering. Johann, Christoph // Pharmaceutical Technology Europe;Mar2005, Vol. 17 Issue 3, p31 

    The article analyzes field-flow fractionation with multiangle light scattering. Macromolecular characterization using asymmetrical-flow field-flow fractionation (AF-FFF) is a nondestructive, one-phase separation mechanism to determine molecular and macromolecular weights and particles in...

  • Type-II core/shell nanoparticle induced photorefractivity. Xiangping Li; Embden, Joel van; Evans, Richard A.; Min Gu // Applied Physics Letters;6/6/2011, Vol. 98 Issue 23, p231107 

    We demonstrate engineering the photocharge generation efficiency of nanoparticles on the nanometer scale by using a type-II band-gap structure. Compared to bare CdSe cores, the dispersion of type-II core/shell nanoparticles in photorefractive polymer led to an average 100% increase in...

  • Bending light backwards. Jamieson, Valerie // New Scientist;3/15/2003, Vol. 177 Issue 2386, p24 

    Reports on the efforts of physicists in building materials that will bend light the opposite way from normal, reversing the way refraction usually works. Explanation on the reversing of refraction; Experiments on the reversing of refraction.

  • A time-resolved glimpse of the terahertz glory. Marston, Philip L. // Nature;2/26/1998, Vol. 391 Issue 6670, p841 

    Describes research which studied so-called glory rings and optical scattering processes. Importance of surface-wave contributions to scattering; Previous research by Van de Hulst; Complicated aspects of scattering process; Research by Daniel Grischkowsky et al, Oklahoma State University;...

  • Particle Size Metrology: Comparison Between Aerosol Electrical Mobility and Laser Surface Light Scattering Techniques. Germer, Thomas A.; Mulholland, George W. // AIP Conference Proceedings;2005, Vol. 788 Issue 1, p579 

    Two different methods used to determine the size of polystyrene spheres were found to disagree by about 5 %. One of the methods, differential mobility analysis, measures particles in the aerosol phase, while the other, laser surface light scattering, measures them bound to a surface. It is...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics