Photothermal heterodyne imaging of individual nonfluorescent nanoclusters and nanocrystals.
Language
en
Article de revue
This item was published in
Physical Review Letters. 2004-12-17, vol. 93, n° 25, p. 257402
American Physical Society
English Abstract
We introduce a new, highly sensitive, and simple heterodyne optical method for imaging individual nonfluorescent nanoclusters and nanocrystals. A 2 order of magnitude improvement of the signal is achieved compared to ...Read more >
We introduce a new, highly sensitive, and simple heterodyne optical method for imaging individual nonfluorescent nanoclusters and nanocrystals. A 2 order of magnitude improvement of the signal is achieved compared to previous methods. This allows for the unprecedented detection of individual small absorptive objects such as metallic clusters (of 67 atoms) or nonluminescent semiconductor nanocrystals. The measured signals are in agreement with a calculation based on the scattering field theory from a photothermal-induced modulated index of refraction profile around the nanoparticle.Read less <
English Keywords
Single molecule detection
gold nanoparticles
semiconductor nanocristal
quantum dots
photothermal effect
Origin
Hal imported