In this letter, we report the observation of backward stimulated Mie scattering in a suspension of CdSe/Cds/ZnS nanocrystals in chloroform, pump by 816-nm or 1064-nm nanosecond laser pulses. The observed stimulated scattering exhibits the features of no frequency-shift, low pump threshold requirement, and easy controllability. For average nanocrystals' size of ∼5.5 nm and weight concentration of 4.5 mg/mL, the measured nonlinear reflectivity (energy conversion efficiency from pump pulse to stimulated scattering pulse) could be up to 32. This nanoparticles-based stimulated scattering effect can find special applications for self-adapted bioimaging, high-sensitivity sensors, lasing feedback elements, and optical ranging and lidar systems.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)