PARRA-VASQUEZ, A. Nicholas G.; OUDJEDI, Laura; COGNET, Laurent; LOUNIS, Brahim

doi:10.1021/jz300369d

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PARRA-VASQUEZ, A. Nicholas G.
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

OUDJEDI, Laura
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

COGNET, Laurent
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

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Journal of Physical Chemistry Letters. 2012-04-30, vol. 3, n° 10, p. 1400

American Chemical Society

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The photothermal heterodyne imaging technique enabled studies of individual weakly absorbing nano-objects in various environments. It uses a photo-induced change in the refractive index of the environment. Taking advantage of the dramatic index of refraction change occurring around a thermotropic liquid crystalline phase transition, we demonstrate a 40-fold signal-to-noise ratio enhancement for gold nanoparticles imaged in 4-Cyano-4'-pentylbiphenyl (5CB) liquid crystals over those in a water environment. We studied the photothermal signal as a function of probe laser polarization, heating power, and sample temperature quantifying the optimal enhancement. This study established photothermal microscopy as a valuable technique for inducing and/or detecting local phase transitions at the nanometer scales.< Leer menos

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single molecule detection

Photothermal microscopy

nanoparticles

thermotropic phase transition

liquid crystals

single molecule detection.

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Nanoscale Thermotropic Phase Transitions Enhance Photothermal Microscopy Signals

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