Abstract
We report on the observation of coherent confined acoustic phonons in CdSe core nanorods. We show that photobleaching and photoabsorption dynamics of nanocrystals, obtained with femtosecond pump–probe transient spectroscopy with a resonant pumping energy, exhibit evidence of oscillatory modulation, due to the modulation of the bandgap, despite the weak excitation regime (<µJ). In particular we found that the modulation frequency corresponds to the coherent radial breathing modes of the rods, suggesting that only the transverse (radial) mode of coherent phonons is observed. No evidence of modulation is observed in the corresponding rod sample overcoated with a thin shell of CdS/ZnS, suggesting that the shell produces a strongly damped mechanism.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
