Photothermal heterodyne imaging of individual non-fluorescent nano-objects

Details Photothermal heterodyne imaging of individual non-fluorescent nano-objects Photothermal heterodyne imaging of individual non-fluorescent nano-objects

2004-08-26

arxiv.org/abs/cond-mat/0408577v1

Physics

Condensed Matter

Other Condensed Matter

Submitted 25Mar04 to PRL

Scientific paper

We introduce a new, highly sensitive, and simple heterodyne optical method for imaging individual non-fluorescent nano-objects. A two orders 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 non-luminescent 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.

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