12 July 1996 Organic compounds with nonlinear optical response enhanced by microparticles prepared at low gravity
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Abstract
We will present the results of study of nonlinear optical organic compounds based on dye doped polymeric micron size spherical particles. These particles are generated on the ground at artificial low gravity. Free falling drops of polymer solution or metal take on the shape close to spherical. The fabrication at real low gravity can substantially improve the sphericity of the particles and their identity. We show that the particles, being combined with different organic chromophores, can potentially increase their nonlinear optical response in practical applications. This effect is associated with the break of symmetry at the particle surface and the interaction of the resonant modes with non-symmetrical molecules at the particle surface. Constructive light interference in an array of microspheres additionally enhances nonlinear response. In our experiments we used polystyrene microspheres with diameter from 1.7 to 5.3 microns. Two- dimensional quasi-crystals were fabricated from polystyrene microspheres and characterized for their structural and nonlinear optical properties. The quasi-crystals were produced with the method based on Langmuir-Blodgett thin film technique. As possible dopants we studied a NPO dye, derivatives of DIVA, disperse dyes. Some of the create Langmuir-Blodgett films combined with spherical particles in the same technological process.
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Sergey S. Sarkisov, Natalia E. Noginova, Aaron Wilkosz, Putcha Venkateswarlu, Michael J. Curley, Ronald D. Clark, "Organic compounds with nonlinear optical response enhanced by microparticles prepared at low gravity", Proc. SPIE 2809, Space Processing of Materials, (12 July 1996); doi: 10.1117/12.244322; https://doi.org/10.1117/12.244322
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KEYWORDS
Particles

Diffraction

Optical spheres

Polymers

Second-harmonic generation

Crystals

Spherical lenses

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