Controlling the energy transfer between near-field optically coupled ZnO quantum dots

We performed time-resolved spectroscopy of ZnO quantum dots (QD), and observed exciton energy transfer and dissipation between QD via an optical near-field interaction. Two different sizes of ZnO QD with resonant energy levels were mixed to test the energy transfer and dissipation using time-resolved photoluminescence spectroscopy. The estimated energy transfer time was 144 ps. Furthermore, we demonstrated that the ratio of energy transfer between the resonant energy states could be controlled.

[1]  H. Koinuma,et al.  Enhancement of exciton binding energies in ZnO/ZnMgO multiquantum wells , 2002 .

[2]  M. Naruse,et al.  Demonstration of nanophotonic NOT gate using near-field optically coupled quantum dots , 2006, 5th IEEE Conference on Nanotechnology, 2005..

[3]  Zikang Tang,et al.  Room-temperature stimulated emission of excitons in ZnO/(Mg, Zn)O superlattices , 2000 .

[4]  Eric A. Meulenkamp,et al.  Synthesis and Growth of ZnO Nanoparticles , 1998 .

[5]  S. An,et al.  Photoluminescent Properties of ZnO/Zn0.8Mg0.2O Nanorod Single-Quantum-Well Structures , 2004 .

[6]  M. Ohtsu,et al.  Demonstration of a nanophotonic switching operation by optical near-field energy transfer , 2003 .

[7]  Marc A. Anderson,et al.  Semiconductor clusters in the sol-gel process: quantized aggregation, gelation, and crystal growth in concentrated zinc oxide colloids , 1991 .

[8]  Motoichi Ohtsu,et al.  Metallized slit-shaped pyramidal Si probe with extremely high resolution for 1.5-Tbit/in2 density near-field optical storage , 2007 .

[9]  Motoichi Ohtsu,et al.  Observation of dissipated optical energy transfer between CdSe quantum dots , 2007 .

[10]  Yiying Wu,et al.  Room-Temperature Ultraviolet Nanowire Nanolasers , 2001, Science.

[11]  M. Ohtsu,et al.  Optical nanofountain: A biomimetic device that concentrates optical energy in a nanometric region , 2005 .

[12]  William L. Wilson,et al.  Luminescence properties of CdSe quantum crystallites: Resonance between interior and surface localized states , 1992 .

[13]  Christopher J. Kiely,et al.  Some recent advances in nanostructure preparation from gold and silver particles: a short topical review , 2002 .

[14]  Gyu-Chul Yi,et al.  Quantum Confinement Observed in ZnO/ZnMgO Nanorod Heterostructures , 2003 .

[15]  Victor I. Klimov,et al.  Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetime , 2003 .

[16]  Suguru Sangu,et al.  Nanophotonic switch using ZnO nanorod double-quantum-well structures , 2007 .

[17]  Louis E. Brus,et al.  Electron-electron and electron-hole interactions in small semiconductor crystallites : The size dependence of the lowest excited electronic state , 1984 .