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Optics | Physics


Greg Taft


The fluorescence of bulk cadmium sulfide and cadmium sulfide nanoparticles were compared. This was done using an 800-nm, unamplified Ti:sapphire laser producing 50-fs pulses. The pulses were frequency doubled using a beta barium borate (BBO) crystal. The 400-nm beam was used to induce fluorescence in the nanoparticles, while the original 800-nm beam was used to induce fluorescence in the bulk CdS by two-photon absorption. The bulk CdS showed a single fluorescent peak at 523 nm. The nanoparticles showed fluorescence at various wavelengths across the visible spectrum. In general, the nanoparticles showed a broad fluorescent spectrum between 500 nm and 750 nm, and a spike between 800 nm and 900 nm. These values shifted depending upon the size of the nanoparticles used. Pump-probe measurements showed a significant increase in the transmission of probe light through the nanoparticle solution when the pump and probe pulses arrived simultaneously.

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