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

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationPhotons Plus Ultrasound
Subtitle of host publicationImaging and Sensing 2010
StatePublished - 2010
EventPhotons Plus Ultrasound: Imaging and Sensing 2010 - San Francisco, CA, United States
Duration: Jan 24 2010Jan 26 2010

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherPhotons Plus Ultrasound: Imaging and Sensing 2010
Country/TerritoryUnited States
CitySan Francisco, CA


  • Gold nanoparticles
  • Optical absorption cross-sections
  • Optical scattering cross-sections
  • Photoacoustic tomography

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging
  • Biomaterials


Dive into the research topics of 'Photoacoustic quantification of the optical absorption cross-sections of gold nanostructures'. Together they form a unique fingerprint.

Cite this