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Proceedings Paper

Photothermal heterodyne phase imaging of gold seed and germanium nanowire
Author(s): Yookyung Jung; Nan Lin; Chen Yang; Ji-Xin Cheng
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Paper Abstract

Photothermal heterodyne imaging has demonstrated a high sensitivity of seeing single metallic nanoparticles of diameter down to 5 nm. However, rare attention has been paid to the phase of the photothermal heterodyne signal relative to that of the modulated pump beam. We show that the phase of the photothermal heterodyne signal from semiconducting nanomaterials such as silicon and germanium nanowires is around 0 degree, while that from metallic nanomaterials such as silver and gold nanoparticles (NPs) is around 180 degrees. Using this property we have been able to distinguish gold seeds from germanium nanowire (GeNW) body in a label-free and contact-free manner. A theoretical model based on light scattering by a fluctuating dielectric material was used to explain the origin of different phases in the photothermal heterodyne signal.

Paper Details

Date Published: 23 February 2010
PDF: 6 pages
Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75642F (23 February 2010); doi: 10.1117/12.841988
Show Author Affiliations
Yookyung Jung, Purdue Univ. (United States)
Nan Lin, Purdue Univ. (United States)
Chen Yang, Purdue Univ. (United States)
Ji-Xin Cheng, Purdue Univ. (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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