Title :
Optical nonlinearities and ultrafast carrier dynamics in semiconductor quantum dots
Author :
Klimov, V. ; McBranch, D. ; Schwarz, C.
Author_Institution :
Chem. Sci. & Technol. Div., Los Alamos Nat. Lab., NM, USA
Abstract :
Low-dimensional semiconductors have attracted great interest due to the potential for tailoring their linear and nonlinear optical properties over a wide-range. Semiconductor nanocrystals (NCs) represent a class of quasi-zero-dimensional objects or quantum dots. In this paper we report femtosecond (fs) studies of ultrafast optical nonlinearities, and energy relaxation and trapping dynamics in three types of quantum-dot systems: semiconductor NC/glass composites made by high temperature precipitation, ion-implanted NCs, and colloidal NCs. Comparison of ultrafast data for different samples allows us to separate effects being intrinsic to quantum dots from those related to lattice imperfections and interface properties
Keywords :
carrier relaxation time; high-speed optical techniques; nonlinear optics; semiconductor quantum dots; colloidal NC; energy relaxation; high temperature precipitation; ion implanted NC; low-dimensional semiconductor nanocrystal; optical nonlinearity; semiconductor NC/glass composite; semiconductor quantum dot; trapping; ultrafast carrier dynamics; Charge carrier processes; Chemical technology; Electron optics; Glass; Nonlinear optics; Optical pumping; Phonons; Quantum dots; US Department of Transportation; Ultrafast optics;
Conference_Titel :
Nonlinear Optics '98: Materials, Fundamentals and Applications Topical Meeting
Conference_Location :
Kauai, HI
Print_ISBN :
0-7803-4950-4
DOI :
10.1109/NLO.1998.710235
