Photothermal heterodyne holography of gold nanoparticles.
Opt Express
; 18(2): 780-6, 2010 Jan 18.
Article
de En
| MEDLINE
| ID: mdl-20173900
ABSTRACT
We report a method based on heterodyne numerical holography associated to photothermal excitation for full field and three-dimensional localisation of metallic nanoparticles. A modulated pump laser (lambda = 532 nm) heats several particles, creating local refractive index changes. This modulation is detected using a probe and a local oscillator beam (lambda = 785 nm), frequency-shifted to create a hologram beating at low frequency. Tens of particles, down to diameters of 10 nm, can be localised simultaneously and selectively in three dimensions with near- diffraction resolution by a numerical reconstruction of a single hologram acquired in 5 s.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Photométrie
/
Réfractométrie
/
Holographie
/
Thermographie
/
Nanoparticules
/
Or
Langue:
En
Journal:
Opt Express
Sujet du journal:
OFTALMOLOGIA
Année:
2010
Type de document:
Article
Pays d'affiliation:
France