Photothermal heterodyne imaging of individual nonfluorescent nanoclusters and nanocrystals.
Langue
en
Article de revue
Ce document a été publié dans
Physical Review Letters. 2004-12-17, vol. 93, n° 25, p. 257402
American Physical Society
Résumé en anglais
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 ...Lire la suite >
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.< Réduire
Mots clés en anglais
Single molecule detection
gold nanoparticles
semiconductor nanocristal
quantum dots
photothermal effect
Origine
Importé de halUnités de recherche