Photoacoustic quantification of the optical absorption cross-sections of gold nanostructures

Chulhong Kim; Eun Chul Cho; Fei Zhou; Claire M. Cobley; Kwang Hyun Song; Jingyi Chen; Zhi-Yuhan Li; Younan Xia; Lihong V. Wang

doi:10.1117/12.843554

23 February 2010 Photoacoustic quantification of the optical absorption cross-sections of gold nanostructures

Chulhong Kim, Eun Chul Cho, Fei Zhou, Claire M. Cobley, Kwang Hyun Song, Jingyi Chen, Zhi-Yuhan Li, Younan Xia, Lihong V. Wang

Author Affiliations +

Proceedings Volume 7564, Photons Plus Ultrasound: Imaging and Sensing 2010; 756430 (2010) https://doi.org/10.1117/12.843554
Event: SPIE BiOS, 2010, San Francisco, California, United States

Abstract

This study demonstrates a method for measuring the optical absorption cross-sections (σ_a) of Au-Ag nanocages and Au nanorods using photoacoustic (PA) sensing. PA signals are directly proportional to the absorption coefficient (μ_a) 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. μ_a) derived from a set of methylene blue solutions with different concentrations. We then calculated σ_a by dividing the μ_a by the corresponding concentration of the Au nanostructure. Additionally, we obtained the extinction cross-section (σ_e, sum of absorption and scattering cross-sections) from the extinction spectrum recorded using a conventional UV-vis-NIR spectrometer. From the measurements of σ_a and σ_e, 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.

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Chulhong Kim, Eun Chul Cho, Fei Zhou, Claire M. Cobley, Kwang Hyun Song, Jingyi Chen, Zhi-Yuhan Li, Younan Xia, and Lihong V. Wang "Photoacoustic quantification of the optical absorption cross-sections of gold nanostructures", Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 756430 (23 February 2010); https://doi.org/10.1117/12.843554

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KEYWORDS

Gold

Absorption

Nanostructures

Nanorods

Scattering

Signal attenuation

Signal detection

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