Title :
Observation of impulsively excited THz acoustical vibrations in PbTe quantum dots
Author :
Steinmeyer, G. ; Tudury, G.E. ; Cesar, C.L. ; Cruz, C.H.B. ; Barbosa, L.C. ; Ippen, E.P.
Author_Institution :
Res. Lab. of Electron., MIT, Cambridge, MA, USA
Abstract :
Summary form only given.We have investigated the femtosecond nonlinear dynamics of PbTe quantum dots grown in a glass matrix and observed impulsive excitation of acoustic resonances of the dots. We have further studied the wavelength dependence of the amplitude, frequency, and damping rate of these phonons. Such data, in conjunction with absorption spectra and femtosecond spectroscopic studies, may provide a new and interesting method for evaluating the size distributions of nanocrystallites.
Keywords :
IV-VI semiconductors; interface phonons; lead compounds; optical saturable absorption; semiconductor doped glasses; semiconductor quantum dots; time resolved spectra; vibrational modes; PbTe; absorption spectra; acoustic resonances; femtosecond nonlinear dynamics; glass matrix; impulsive excitation; nanocrystallites; phonon amplitude; phonon damping rate; phonon frequency; quantum dots; size distributions; terahertz acoustical vibrations; wavelength dependence; Dielectrics; Nanoparticles; Plasmons; Pulse amplifiers; Pulse measurements; Quantum dot lasers; Quantum dots; Resonance; Silver; US Department of Transportation;
Conference_Titel :
Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-541-2
DOI :
10.1109/IQEC.1998.680199
