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Nonlinear Optical Absorption in Colloidal CdS Quantum Dots: The Role of Dielectric Environment

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We have theoretically studied the third-order nonlinear optical absorption coefficient in colloidal CdS quantum dots capped by various dielectric matrix materials. We find that the nonlinear optical property is highly affected by the nature of the matrix material. To accurately calculate the absorption coefficient, it is very important to consider carefully the dielectric mismatch effect usually present in the colloidal QD-matrix systems. This effect can cause considerable changes in the absorption peak intensity and in the threshold energy. In the quantum dots within very weak confinement regime, the dielectric mismatch effect on the threshold energy is found to be negligible but its effect on the peak intensity remain significant.
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Keywords: COLLOIDAL QUANTUM DOTS; II–VI SEMICONDUCTORS; NONLINEAR OPTICAL PROPERTIES

Document Type: Research Article

Publication date: October 1, 2016

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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