Optimization of ultrathin-film nonresonant Raman spectra provided by combining a light-trapping device, a high N.A. objective, and a spectrometer.
The association of a four-media stratified illumination device and a high N.A. objective allowed us to obtain nonresonant Raman spectra of ultrathin films. The signal-to-noise ratio provided by this combination was computed. From this ratio we derived the optimization of the illumination conditions and optical coupling of the objective with the sample and with the spectrometer.
Aurengo
A
A
Universite Paris Sud, Institut d'Optique, 91405 Orsay, France.
Levy
Y
Y
Dupeyrat
R
R