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Journal Articles ACS Nano Year : 2012

Thermal Imaging of Nanostructures by Quantitative Optical Phase Analysis

Guillaume Baffou
Pierre Bon
Julien Savatier
  • Function : Author
Marine Merlin
  • Function : Author
Herve Rigneault
Serge Monneret

Abstract

We introduce an optical microscopy technique aimed at characterizing the heat generation arising from nanostructures, in a comprehensive and quantitative manner. Namely, the technique permits (i) mapping the temperature distribution around the source of heat, (ii) mapping the heat power density delivered by the source, and (iii) retrieving the absolute absorption cross section of light-absorbing structures. The technique is based on the measure of the thermal-induced refractive index variation of the medium surrounding the source of heat. The measurement is achieved using an association of a regular CCD camera along with a modified Hartmann diffraction grating. Such a simple association makes this technique straightforward to implement on any conventional microscope with its native broadband illumination conditions. We illustrate this technique on gold nanoparticles illuminated at their plasmonic resonance. The spatial resolution of this technique is diffraction limited, and temperature variations weaker than 1 K can be detected.
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Dates and versions

hal-00729073 , version 1 (07-09-2012)

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Guillaume Baffou, Pierre Bon, Julien Savatier, Julien Polleux, Min Zhu, et al.. Thermal Imaging of Nanostructures by Quantitative Optical Phase Analysis. ACS Nano, 2012, 6 (3), pp.2452 - 2458. ⟨10.1021/nn2047586⟩. ⟨hal-00729073⟩
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