Photothermal heterodyne phase imaging of gold seed and germanium nanowire

Yookyung Jung; Nan Lin; Chen Yang; Ji-Xin Cheng

doi:10.1117/12.841988

23 February 2010 Photothermal heterodyne phase imaging of gold seed and germanium nanowire

Yookyung Jung, Nan Lin, Chen Yang, Ji-Xin Cheng

Proceedings Volume 7564, Photons Plus Ultrasound: Imaging and Sensing 2010; 75642F (2010) https://doi.org/10.1117/12.841988
Event: SPIE BiOS, 2010, San Francisco, California, United States

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.

Citation Download Citation

Yookyung Jung, Nan Lin, Chen Yang, and Ji-Xin Cheng "Photothermal heterodyne phase imaging of gold seed and germanium nanowire", Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75642F (23 February 2010); https://doi.org/10.1117/12.841988

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