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Title: Gold nanoparticles as contrast agents for nonlinear microscopy
Keywords: Nonlinear optics, nanoparticles, numerical analysis, subwavelength optics
Issue Date: 20-Jan-2012
Citation: NAVEEN KUMAR BALLA (2012-01-20). Gold nanoparticles as contrast agents for nonlinear microscopy. ScholarBank@NUS Repository.
Abstract: Gold nanoparticles can be used as contrast agents for nonlinear optical microscopy because of their strong plasmon resonance. I have developed a numerical method which assumes that a scatterer is made of interacting dipoles. I have shown that the dipole coupling is necessary for predicting the effects of shape and size of a nanoparticle on its nonlinear optical properties. For a given material and excitation wavelength(s), this dipole model can be used to screen nanoparticles of different shapes for optimal nonlinear scattering of a particular kind. On the experimental side, I developed a generic methodology to conjugate gold nanoparticles to ligands so that these nanoparticles can be targeted to specific biological samples. Finally I demonstrated that multiphoton microscopy of gold nanorods with an excitation wavelength away from their plasmon resonance causes less photo-thermal damage without significantly compromising the multiphoton luminescence signal from the nanorods.
Appears in Collections:Ph.D Theses (Open)

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