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NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/16729

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/16729

Title:	OPTICAL PROPERTIES OF CdTe AND CdS QUANTUM DOTS IN GLASS
Authors:	V. Esch;K. Kang;B. Fluegel;Y. Z. Hu;G. Khitroya;H. M. Gibbs;S. W. Koch;N. Peygambarian;Liu, Li‐Chi;S. H. Risbud
Contributors:	物理學系
Date:	1992-01
Issue Date:	2013-06-05T07:45:51Z
Publisher:	World Scientific Publishing Co.
Abstract:	We summarize the linear and nonlinear optical properties of a variety of CdTe and CdS quantum dots in glass. The measured linear absorption of the CdTe sample is compared with calculations involving valence-band mixing due to the quantum confinement. The temperature dependence of the lowest quantum-confined transition and its linewidth for samples with various crystallite sizes are measured and compared with a simple model. It is found that the shift of the energetically lowest quantum-confined transition as a function of temperature is the same as the temperature-dependent band-gap reduction in bulk materials. Excitation of the sample with pulses ranging from femtoseconds to microseconds allows distinguishing between various mechanisms responsible for the observed optical nonlinearities. At very early times, phase-space filling and Coulomb interaction between the excited charged carriers are responsible for the absorption changes. At later times, Coulomb effects due to “trapped” carriers remain and last for nanoseconds or microseconds.
Relation:	Journal of Nonlinear Optical Physics and Materials, 1(1): 25-50
Appears in Collections:	[Department of Physics] Periodical Articles

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