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Title: Nonlinear optics in new nanomaterials
Keywords: nonlinear optics, ultrafast, optical limiting, carbon nanotubes, tio2-pmma, fullerene
Issue Date: 22-Nov-2005
Citation: HENDRY IZAAC ELIM (2005-11-22). Nonlinear optics in new nanomaterials. ScholarBank@NUS Repository.
Abstract: One of the most attractive properties of nanomaterials is their giant nonlinear optical (NLO) response, as predicted by quantum confinement theories. In this thesis, we present our experimental investigation into the NLO properties of a wide range of novel nanomaterials. These materials include nanohybrid particles of poly(methyl methacrylate)-TiO2, multi-walled carbon nanotubes film, carbon nanoballs and nanoparticles, amorphous SixNy or amorphous SiC coated multi-walled carbon nanotubes, and fullerene (C60) incorporated with polymers. The NLO properties are determined with Z-scan techniques, pump-probe experiments and energy-dependent transmission measurements.By being exposed to femtosecond laser pulses, the poly(methyl methacrylate)-TiO2 nanoparticles are revealed to possess large, ultrafast, third-order optical nonlinearities at wavelengths close to the lowest excitonic transition. Moreover, the saturable absorption and associated nonlinear refraction of multi-walled carbon nanotube films are identified for potential application in optical switching devices due to their strong and ultrafast response. In addition, the nanosecond optical limiting properties of carbon nanocomposites of Co40Graphite60 and carbon nanoparticles as well as mono-functional fullerene[60] (FCA) incorporated with polymers are found to be superior to that of C60.
Appears in Collections:Ph.D Theses (Open)

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