Ms. Angela Shields Profile

Angela Shields

at NASA Marshall Space Flight Ctr

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Proceedings Article | 12 July 1996 Paper

Nonlinear optical properties of organic and polymeric thin film materials of potential for microgravity processing studies

Hossin Abdeldayem, Donald Frazier, Mark Paley, Benjamin Penn, William Witherow, Curtis Banks, Angela Shields, Rosline Hicks, Paul Ashley

Proceedings Volume 2809, (1996) https://doi.org/10.1117/12.244321

KEYWORDS: Absorption, Thin films, Helium neon lasers, Polymer thin films, Bistability, Integrated optics, Scattering, Polymers, Nonlinear optics, Optical switching

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In this paper, we will take a closer look at the state of the art of polydiacetylene, and metal-free phthalocyanine films, in view of the microgravity impact on their optical properties, their nonlinear optical properties and their potential advantages for integrated optics. These materials have many attractive features with regard to their use in integrated optical circuits and optical switching. Thin films of these materials processed in microgravity environment show enhanced optical quality and better molecular alignment than those processed in unit gravity. Our studies of these materials indicate that microgravity can play a major role in integrated optics technology. Polydiacetylene films are produced by UV irradiation of monomer solution through an optical window. This novel technique of forming polydiacetylene thin films has been modified for constructing sophisticated micro-structure integrated optical patterns using a pre-programmed UV-laser beam. Wave guiding through these thin films by the prism coupler technique has been demonstrated. The third order nonlinear parameters of these films have been evaluated. Metal-free phthalocyanine films of good optical quality are processed in our laboratories by vapor deposition technique. Initial studies on these films indicate that they have excellent chemical, laser, and environmental stability. They have large nonlinear optical parameters and show intrinsic optical bistability. This bistability is essential for optical logic gates and optical switching applications. Waveguiding and device making investigations of these materials are underway.

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