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Proceedings Paper

Second harmonic generation of chiral-modified silver nanoparticles
Author(s): Yue Tao; Gabriela Aldea-Nunzi; Sanyasi Rao Bobbara; Jean-Michel Nunzi
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Paper Abstract

Various approaches for the optical detection of chiral compounds have been developed due to their natural optical activity. Since the advantages of second harmonic generation (SHG) on noble-metal nanoparticles (NPs) have been observed, it would be interesting to study the nonlinear phenomena from chiral compounds attached Ag NPs. In the present work, we fabricated chiral-modified Ag NPs based on the self-assembly process of cysteine and Ag, and carried out the investigation on SHG on modified and unmodified Ag NPs. For modified Ag NPs, either L-Cysteine (L-C) or D-Cysteine (D-C), as a pair of enantiomers, was applied on top of the Ag NPs. The resulting chiral-modified monolayers of L-C/Ag NPs and D-C/Ag NPs exhibit a reversed optical rotation difference (ORD) at linearly ±45° polarization of SH, where no such difference exists for Ag NPs alone. SHG efficiently probes and discriminates L-C from D-C monolayers on the modified Ag NPs, which constitutes a simple and sensitive optical diagnostic of chiral molecules.

Paper Details

Date Published: 11 October 2013
PDF: 7 pages
Proc. SPIE 8915, Photonics North 2013, 891513 (11 October 2013); doi: 10.1117/12.2033655
Show Author Affiliations
Yue Tao, Queen's Univ. (Canada)
Gabriela Aldea-Nunzi, Queen's Univ. (Canada)
Sanyasi Rao Bobbara, Queen's Univ. (Canada)
Jean-Michel Nunzi, Queen's Univ. (Canada)

Published in SPIE Proceedings Vol. 8915:
Photonics North 2013
Pavel Cheben; Jens Schmid; Caroline Boudoux; Lawrence R. Chen; André Delâge; Siegfried Janz; Raman Kashyap; David J. Lockwood; Hans-Peter Loock; Zetian Mi, Editor(s)

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