Full Content is available to subscribers

Subscribe/Learn More  >

Theory of Photoacoustic Characterization of Thermophysical Properties of Multilayered Nanofilms

[+] Author Affiliations
Hanping Hu, Wei Zhang, Jun Xu, Yi Dong

University of Science and Technology of China, Hefei, Anhui, China

Xianfan Xu

Purdue University, West Lafayette, IN

Paper No. MNC2007-21293, pp. 835-844; 10 pages
  • 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems
  • First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B
  • Sanya, Hainan, China, January 10–13, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4265-7 | eISBN: 0-7918-3794-7
  • Copyright © 2007 by ASME


In this work, the use of the photoacoustic technique for probing thermophysical properties of multi-layered nanofilms is explored. In the photoacoustic measurement of nanofilms, the thermal diffusion length must match with the thickness of the thin film, and the modulating frequency of the incident light should be much higher than usual so that to enhance the thermal-mechanical coupling and the spatial waviness of photoacoustic signal in both photoacoustic cell and sample itself. The current photoacoustic technique cannot fulfill the requirement of measuring thermophysical properties of multi-layered nanofilms. In present study, we develop a general photoacoustic model which takes thermal, mechanical, and optical properties, the geometry of a multilayer film, as well as the thermal contact resistances between layers into consideration. The frequency of the photoacoustic effect is extended to the ultrasonic region. The possibility of taking advantage of the resonance in the photoacoustic cell to overcome the decrease of the photoacoustic signal with the frequency increase is also explored. It is suggested that at high frequencies, the photoacoustic signals are obtained close to the resonance peak, which also contains the information of material’s properties. Resonance frequencies, sensitivity and the frequency range with the highest sensitivity for different types of materials are analyzed. As an example, calculations of the photoacoustic signals of nanofilms of SiO2 and Ni show that increasing the frequency can improve the precision and accuracy of the photoacoustic measurement, and the photoacoustic technique is promising for depth-profiling of thermophysical properties of multi-layered nanofilms.

Copyright © 2007 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In