Title :
Photothermal heterodyne imaging and absorption spectroscopy of individual nonfluorescent nanoobjects
Author :
Berciaud, Stéphane ; Lasne, David ; Blab, Gerhard A. ; Tamarat, Philippe ; Cognet, Laurent ; Lounis, Brahim
Author_Institution :
Centre de Physique Moleculaire Optique et Hertzienne, CNRS, Talence, France
Abstract :
An all-optical method called photothermal heterodyne imaging (PHI) is developed that allows for the detection of individual nano-objects such as gold nanoparticles with diameter down to 1.4 μm (67 atoms) as well as nonluminescent semiconductor nanocrystals. This observation of intrinsic size effects in the optical response of gold nanoparticles is analysed within the frame of Mie theory using a size-dependent surface damping term in the dielectric constant.
Keywords :
gold; heterodyne detection; nanoparticles; nanotechnology; photothermal spectroscopy; Au; Mie theory; absorption spectroscopy; dielectric constant; gold nanoparticles; nonfluorescent nanoobjects; nonluminescent semiconductor nanocrystals; photothermal heterodyne imaging; size effects; surface damping; Absorption; Atom optics; Damping; Dielectric constant; Gold; Nanocrystals; Nanoparticles; Optical imaging; Optical mixing; Spectroscopy;
Conference_Titel :
Quantum Electronics Conference, 2005. EQEC '05. European
Print_ISBN :
0-7803-8973-5
DOI :
10.1109/EQEC.2005.1567509
