Use of Gratings to Detect Small Quantities of Materials by Raman
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
The sensitivity of Raman spectroscopy can be improved by a factor of 10 by depositing the sample to be analyzed on a grating especially designed for efficient excitation of surface plasmons at the frequency of the exciting laser light. The angle of incidence of the laser beam onto the grating is also adjusted for maximum surface plasmon excitation. By this technique we have been able to detect layers of polymer 100 angstroms thick and 6 monolayers of cadmium arachidate. We have extended the measurements to layers one monolayer thick.