Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15955
Title: Optical Near-Field Enhancement by Micro/Nano Particles for Nanotechnology Applications
Authors: ZHOU YI
Keywords: Near-filed optics, evanescent wave, nanotechnology, plasmonic effect, laser cleaning
Issue Date: 25-Sep-2008
Source: ZHOU YI (2008-09-25). Optical Near-Field Enhancement by Micro/Nano Particles for Nanotechnology Applications. ScholarBank@NUS Repository.
Abstract: This thesis aims to study issues related to the optical near-field enhancement induced by small particles under laser irradiation: (1) optical near-field enhancement effect of dielectric particles for laser cleaning/nanopatterning applications, and (2) plasmonic resonance by metallic nanoparticles. Near-field optics (NFO) deals with optical phenomena involving evanescent wave which becomes dominating when the sizes of the objects are in the order of wavelength or even smaller. This locally enhanced electromagnetic wave makes diffraction limit less restrictive by confining light wave in a sufficiently small volume for the nanotechnology applications.In the studies, nanopatterning beyond diffraction limit on transparent glass substrates was demonstrated by 800 nm /100 fs femtosecond laser irradiation of self-assembled micro-silica particles array. Mie theory was used for the explanation of the formation of nano-patterns theoretically. By controlling the laser fluences, the mechanisms of nano-patterning/laser cleaning were investigated experimentally. Plasmonic resonance enhanced absorption of laser energy by metallic spherical nanoparticles was discussed. This plasmonic effect can help to clean metallic nanoparticles. The ability to clean 40 nm gold particles from the Si substrate was experimentally demonstrated.
URI: http://scholarbank.nus.edu.sg/handle/10635/15955
Appears in Collections:Ph.D Theses (Open)

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