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Proceedings Paper

Tunable refractive index materials with metallic nano-spheres dispersed in organic liquids
Author(s): Andres Diaz; Shoichi Kubo; Yan Tang; Justin Liou; Theresa S. Mayer; Iam Choon Khoo; Thomas E. Mallouk
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Paper Abstract

Metamaterials are of substantial current interest because they may exhibit unusual and/or configurable optical responses. We studied the optical properties of gold and silver nanoparticles dispersed in different organic liquids in the visible to near-IR. Calculation of the refractive indices of metallic nanospheres or metallic-coated silica spheres in liquid crystals show the possibility of tuning and varying the refractive index by reorientation of the liquid crystal molecules. Measurements of the refractive indices of gold nanoparticles in dodecane were experimentally studied by using spectroscopic ellipsometry and a reasonable agreement with the theoretical results based on Mie scattering was obtained. Finally, the effect of gold and silver nanospheres on the nonlinear absorption properties of an organic liquid (L34, a 4,4'-dialkyl phenyleneethynylene) was studied. The results suggest that metallic nanoparticles dispersed in a host organic fluids can be good materials for fabrication of low and tunable index materials in the visible to near-IR wavelength range, and for the enhancement of the nonlinear absorption of liquids used in switching applications.

Paper Details

Date Published: 12 September 2007
PDF: 8 pages
Proc. SPIE 6654, Liquid Crystals XI, 66540V (12 September 2007); doi: 10.1117/12.736552
Show Author Affiliations
Andres Diaz, The Pennsylvania State Univ. (United States)
Shoichi Kubo, The Pennsylvania State Univ. (United States)
Tokyo Institute of Technology (Japan)
Yan Tang, The Pennsylvania State Univ. (United States)
Justin Liou, The Pennsylvania State Univ. (United States)
Theresa S. Mayer, The Pennsylvania State Univ. (United States)
Iam Choon Khoo, The Pennsylvania State Univ. (United States)
Thomas E. Mallouk, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 6654:
Liquid Crystals XI
Iam Choon Khoo, Editor(s)

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