Research Papers

Measurement of chromophores density using high Q-factor silica microspheres

[+] Author Affiliations
Ishac Kandas, Nader Shehata

Virginia Tech, Bradley Department of Electrical and Computer Engineering, 302 Whittemore Hall, Perry Street, Blacksburg, Virginia 24061, United States

Alexandria University, Department of Engineering Mathematics and Physics, Faculty of Engineering, Lotfy El-Sied Street off Gamal Abd El-Naser Street, Alexandria 21544, Egypt

Alexandria University, Center of Smart Nanotechnology and Photonics, SmartCI Research Center, Lotfy El-Sied Street off Gamal Abd El-Naser Street, Alexandria 21544, Egypt

Chalongrat Daengngam

Prince of Songkla University, Department of Physics, Faculty of Science, 15 Karnjanavanich Road, Hat Yai, Songkhla 90110, Thailand

Islam Ashry

Virginia Tech, Bradley Department of Electrical and Computer Engineering, 302 Whittemore Hall, Perry Street, Blacksburg, Virginia 24061, United States

Alexandria University, Department of Engineering Mathematics and Physics, Faculty of Engineering, Lotfy El-Sied Street off Gamal Abd El-Naser Street, Alexandria 21544, Egypt

Yong Xu

Virginia Tech, Bradley Department of Electrical and Computer Engineering, 302 Whittemore Hall, Perry Street, Blacksburg, Virginia 24061, United States

J. Nanophoton. 10(1), 016012 (Mar 08, 2016). doi:10.1117/1.JNP.10.016012
History: Received October 3, 2015; Accepted February 16, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Ishac Kandas ; Nader Shehata ; Chalongrat Daengngam ; Islam Ashry and Yong Xu
"Measurement of chromophores density using high Q-factor silica microspheres", J. Nanophoton. 10(1), 016012 (Mar 08, 2016). ; http://dx.doi.org/10.1117/1.JNP.10.016012


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