SOL-ID

Encapsulated metal core nanoparticles having a Raman reporter molecule associated with the core, which particles produce a surface enhanced Raman spectrum upon illumination with light of an appropriate wavelength; particle carriers used to mark materials such as currency and documents with encapsulated metal core nanoparticles for identification purposes; particle detectors used to detect the Raman spectrum of encapsulated metal core nanoparticles having a Raman reporter molecule associated with the core used for materials such as currency and documents for identification purposes