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Proceedings Paper

Photoacoustic quantification of the optical absorption cross-sections of gold nanostructures
Author(s): Chulhong Kim; Eun Chul Cho; Fei Zhou; Claire M. Cobley; Kwang Hyun Song; Jingyi Chen; Zhi-Yuhan Li; Younan Xia; Lihong V. Wang
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Paper Abstract

This study demonstrates a method for measuring the optical absorption cross-sections (σa) of Au-Ag nanocages and Au nanorods using photoacoustic (PA) sensing. PA signals are directly proportional to the absorption coefficient (μa) of the nanostructure. For each type of nanostructure, we first obtained μa from the PA signal by benchmarking against a linear calibration curve (PA signal vs. μa) derived from a set of methylene blue solutions with different concentrations. We then calculated σa by dividing the μa by the corresponding concentration of the Au nanostructure. Additionally, we obtained the extinction cross-section (σe, sum of absorption and scattering cross-sections) from the extinction spectrum recorded using a conventional UV-vis-NIR spectrometer. From the measurements of σa and σe, we were able to easily derive both the absorption and scattering cross-sections for each type of gold nanostructure. This method can potentially provide the optical absorption and scattering properties of gold nanostructures and other types of nanomaterials.

Paper Details

Date Published: 23 February 2010
PDF: 5 pages
Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 756430 (23 February 2010); doi: 10.1117/12.843554
Show Author Affiliations
Chulhong Kim, Washington Univ. in St. Louis (United States)
Eun Chul Cho, Washington Univ. in St. Louis (United States)
Fei Zhou, Institute of Physics (China)
Claire M. Cobley, Washington Univ. in St. Louis (United States)
Kwang Hyun Song, Univ. of Texas Southwestern Medical Ctr. at Dallas (United States)
Jingyi Chen, Washington Univ. in St. Louis (United States)
Zhi-Yuhan Li, Institute of Physics (China)
Younan Xia, Washington Univ. in St. Louis (United States)
Lihong V. Wang, Washington Univ. in St. Louis (United States)


Published in SPIE Proceedings Vol. 7564:
Photons Plus Ultrasound: Imaging and Sensing 2010
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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