TITLE

Optical anisotropy of Langmuir-Blodgett sapphyrin films

AUTHOR(S)
Di Natale, C.; Goletti, C.; Paolesse, R.; Della Sala, F.; Drago, M.; Chiaradia, P.; Lugli, P.; D'Amico, A.
PUB. DATE
November 2000
SOURCE
Applied Physics Letters;11/13/2000, Vol. 77 Issue 20
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The polarization dependence of the optical reflectivity for sapphyrin layers deposited by the Langmuir-Blodgett technique onto a gold substrate has been measured. The experimental results show that characteristic reflectance anisotropy spectroscopy (RAS) spectra are related to layers of different thicknesses. In order to interpret the measured spectral features, the anisotropy of the optical properties of the sapphyrin molecule has been evaluated by using a semi-empirical quantum chemistry approach. The results show clearly that the main RAS structures are related to the electronic properties of the sapphyrin molecules. In particular, two different regimes are observed. Below one (true) monolayer, the optical signal remains very low and structureless, in agreement with the sapphyrin molecules being stacked with their planes almost perpendicular to the substrate plane. Above one monolayer, instead, a strong RAS signal related to the Soret band develops, suggesting that sapphyrin molecules lay more parallel to the substrate surface, in an ordered fashion. © 2000 American Institute of Physics.
ACCESSION #
4413886

 

Related Articles

  • In-plane anisotropy in batch-produced Langmuir–Blodgett films: Side-by-side and face-to-face arrays. Tabe, Yuka; Ikegami, Keiichi; Kuroda, Shin-ichi; Saito, Kazuhiro; Saito, Mitsuyoshi; Sugi, Michio // Applied Physics Letters;9/17/1990, Vol. 57 Issue 12, p1191 

    In-plane anisotropy of Langmuir–Blodgett (LB) films is affected by the arrangement of substrates when many samples are batch produced in one single trough. We examined the dichroic behavior for two different cases of the batch production. In the case of substrates aligned side by side,...

  • Quadropolar and polar anisotropy in end-grafted alpha-helical poly(gamma-benzyl-L-glutamate) on... Ying Chih Chang; Frank, Curtis W. // Journal of Chemical Physics;10/1/1999, Vol. 111 Issue 13, p6136 

    Studies the degree of quadropolar and polar anisotropy in end-grafted alpha helical(gamma-benzyl-L-glutamate) chains using grazing incidence Fourier transform infrared spectroscopy and electrooptic measurements. Comparison with data obtained on spin-cast and on Langmuir-Blodgett films;...

  • Soft magnetic properties of composite-anisotropy CoNbZr/ceramics multilayers (invited). Sugawara, E.; Yamaguchi, K.; Furukawa, S.; Matsumoto, F.; Fujimori, H.; Masumoto, T. // Journal of Applied Physics;5/15/1993, Vol. 73 Issue 10, p5580 

    Presents a study that investigated cobalt niobium zirconium/ceramics multilayered films, the metal layers of which have sequentially changed anisotropy directions.

  • Dielectric anisotropy and photoinduced voltage in Langmuir–Blodgett films of retinal derivatives. de Oliveira, Helinando P.; Tenorio, Alexandro C.; de Melo, Celso P. // Journal of Applied Physics;2/15/2003, Vol. 93 Issue 4, p2198 

    We have investigated the photovoltaic response and measured the impedance of mixed LangmuirBlodgett films of retinal derivatives and behenic acid along three perpendicular directions. The results indicate that the molecular dipoles in these samples are preferentially oriented in the direction...

  • Perpendicular magnetic anisotropy of Fe/SiO2 multilayer film. Senda, Masakatsu; Nagai, Yasuhiro // Journal of Applied Physics;10/1/1990, Vol. 68 Issue 7, p3508 

    Investigates the conditions which lead to soft-magnetic properties of Fe/SiO[sub2] multilayer film from the viewpoint of perpendicular magnetic anisotropy. Experimental procedure; Information on the magnetization measurement.

  • Effect of spacer material on the magnetic surface anisotropy in ultrathin Fe70B30 multilayer films. Hicken, R. J.; Rado, G. T.; Chien, C. L. // Journal of Applied Physics;4/15/1991, Vol. 69 Issue 8, p5301 

    Presents information on a study on the effects of the spacer material on the surface anisotropy in ultrathin iron-boron multilayer films. Magnetic surface anisotropy potassium in iron-boron multilayer films; Low-angle x-ray diffraction measurements; Vibrating sample magnetometer measurements;...

  • Magnetic properties and structure of DyNi/Mo multilayers. Perera, P.; O’Shea, M. J.; Fert, A. // Journal of Applied Physics;4/15/1991, Vol. 69 Issue 8, p5292 

    Presents a study that evaluated the magnetic properties and structure of dysprosium-nickel/ molybdenum multilayered thin films. Effect of the interface on the magnetic anisotropy of the thin film; Determination of the anisotropy constant of the thin film; Factors that influence magnetic anisotropy.

  • Microstructural dependence of magnetic properties of Pt/Co multilayer thin films. Li, Z. G.; Carcia, P. F. // Journal of Applied Physics;1/15/1992, Vol. 71 Issue 2, p842 

    Discusses a study on the dependence of the magnetic properties of thin film platinum/cobalt multilayers with perpendicular magnetic anisotropy on their preparation. Magnetic properties of films sputtered with a smaller mass gas; Relationship between microstructural differences and magnetic...

  • Anisotropic photoconduction in novel photoconductive (oligo phenylene sulfide)–polyimide films cast on a Langmuir–Blodgett polyimide underlayer. Takimoto, Akio; Suzuki, Masa-aki; Wakemoto, Hirofumi; Osazki, Yusuke; Ogawa, Hisahito // Journal of Chemical Physics;9/15/1993, Vol. 99 Issue 6, p4729 

    Two methods for preparing highly oriented crystalline polyimide films comprised of oligo-p-phenylene sulfide [–(C6H5S)n-1–C6H4–:n=3,4,5...] monomers have been developed, which show novel photoconductivity. The first method is using modified terminals of the polymer chains...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics