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Nonlinear optics in quantum-confined and surface-plasmon structures

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/10916

Nonlinear optics in quantum-confined and surface-plasmon structures

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Title: Nonlinear optics in quantum-confined and surface-plasmon structures
Author: Wang, Li
Advisor(s): Jain, Ravinder
Committee Member(s): Lester, Luke
Sheik-Bahae, Mansoor
Diels, Jean-Claude
Department: University of New Mexico. Dept. of Electrical and Computer Engineering
Subject(s): nonlinear optics
quantum-confinement
semiconductor
surface plasmons
LC Subject(s): Nonlinear optics.
Photoabsorption.
Quantum dots.
Two-photon absorbing materials.
Degree Level: Doctoral
Abstract: Nonlinear absorption, such as two-photon absorption (TPA), is a process in which several photons (each photon energy < semiconductor bandgap Eg) are absorbed simultaneously via one or more virtual states to create electron-hole pairs. The objectives of this thesis are: (a) to study and understand quantum confinement enhanced nonlinear absorption in several quantum-confined semiconductors, which may enable the design and fabrication of nonlinear optoelectronic devices to be used in time-domain demultiplexing applications, (b) to explore surface-plasmon enhanced linear and nonlinear absorption in semiconductor quantum dots, and (c) propose new designs that might be useful in nonlinear imaging applications. In particular, I will elaborate on these specific aspects of this topic, namely: 1) The observation of electrical two-photon absorption signals in InAs quantum dot ridge waveguide device over a dynamic range of >3 orders of magnitude. Such a large dynamic range is expected to make an impact on the demultiplexing capabilities of such TPA devices. 2) The study of resonantly enhanced two-photon absorption in colloidal CdSe/ZnS quantum dot samples. The two-photon absorption-induced fluorescence (TPAF) showed a 68-fold enhancement when the TPAF excitation wavelength is changed from 900 nm to 780 nm. I will discuss the use of such ultrasmall semiconductor quantum dots for specialized nonlinear bio-imaging applications. 3) The investigation of surface-plasmon enhanced fluorescence from CdSe/ZnS quantum dots. New nanoplasmonic structures have been designed with an objective of realizing “ultrabright” fluorescent plasmonic quantum dots in the near future.
Graduation Date: May 2010
URI: http://hdl.handle.net/1928/10916

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