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Journal of Nanophotonics

Measurement of chromophores density using high Q-factor silica microspheres
Author(s): Ishac L. N. Kandas; Nader Shehata; Chalongrat Daengngam; Islam Ashry; Yong Xu
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Paper Abstract

This work investigates the relationship between the Q factor of a silica microsphere coated with nonlinear optical molecules and the surface density of the nonlinear molecules. Two types of nonlinear molecules are studied: poly{1-[p-(3′-carboxy-4′-hydroxyphenylazo) benzenesulfonamido]-1,2-ethandiyl} (PCBS), and Procion Brown MX-GRN (PB). In our experiments, we coat silica microspheres with ionic self-assembled multilayer films with different thicknesses as well as with different PCBS/PB chromophores densities. The Q factors of the coated microspheres are measured to be within the range of 106 to 107, which can be attributed to the optical absorption of the coated chromophores. This work can be used to experimentally determine the effective density of chromophores assembled on the silica microsphere. It may also find applications in chemical/biological sensing.

Paper Details

Date Published: 8 March 2016
PDF: 8 pages
J. Nanophoton. 10(1) 016012 doi: 10.1117/1.JNP.10.016012
Published in: Journal of Nanophotonics Volume 10, Issue 1
Show Author Affiliations
Ishac L. N. Kandas, Virginia Polytechnic Institute and State Univ. (United States)
Alexandria Univ. (Egypt)
Nader Shehata, Virginia Polytechnic Institute and State Univ. (United States)
Alexandria Univ. (Egypt)
Chalongrat Daengngam, Prince of Songkla University (Thailand)
Islam Ashry, Virginia Polytechnic Institute and State Univ. (United States)
Alexandria Univ. (Egypt)
Yong Xu, Virginia Polytechnic Institute and State Univ. (United States)


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