Molecular Architectural Approach to Novel Electro-Optical Materials Page: 5 of 17
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
more desirable because the inherent nonlinear optical properties of the molecular layers are
additive, whereas in symmetric systems the nonlinear response cancels within each
symmetric bilayer due to destructive interference.
In this report, we describe the preparation of a novel asymmetric assembly and use
sum-frequency generation (o,+o2) and second-harmonic generation (where w1=w2) to
determine the degree of structural order and the second-order nonlinear susceptibility (d33),
respectively. The spontaneously self-assembled, polar multilayer film (Figure 1) was
grown by drop casting on a silica substrate. Using single wavelength ellipsometry to
measure film thickness,' the average molecular orientation of the chromophores is also
determined. One of the interesting features of these materials is that they are initially
formed by weak intermolecular interactions (hydrogen bonds) and yet ultimately yield
thermodynamically stable and robust macroscale structures.
Importance to LANL's Science and Technology Base and National R&D Needs
This project supports several Laboratory core competencies and missions. First,
advanced materials remain as one of the core competencies at Los Alamos National
Laboratory because the fundamental of materials structures and materials properties is
critical in many important applications, including defense-related applications.
Understanding materials structures and ordering at the molecular level is the key to solving
issues in existing materials applications and to predict future high performance materials.
Secondly, self-assembled materials are closely related to biological systems.
Therefore, understanding molecular self-assemblies, their structures, and their physical
properties would lead to new design principles of chemical sensors or biosensors. Both
chemical sensors and biosensors are playing a key role in the on-going thrust area of Threat
Reduction here at the Laboratory. Interactions of molecular self-assemblies at device
surfaces are vital to information transduction of sensor technology. This project provides
fundamental scientific understanding and insights into molecular interactions, ordering, and
their collective effects.
Thirdly, nonlinear optical materials hold great potential applications in optical
computing. Therefore this project indirectly supports the effort to build a base of scientific
knowledge in advanced computing at the Laboratory. A principal example of the potential
application for these electro-optic materials is in optical switching and data transmission.
Successes in preparation of these materials would allow faster and cheaper routing of
information along fiber-optic networks and enable users to interconnect economically to
high-quality telecommunication systems.
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Li, D.; Johal, M.S.; Smilowitz, L.B. & Robinson, J.M. Molecular Architectural Approach to Novel Electro-Optical Materials, report, June 29, 1999; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc723360/m1/5/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.