Tomorrow: University PhD Dissertation Defense of Anika Amir Kinkhabwala
anikak at stanford.edu
Thu Jun 10 11:57:29 PDT 2010
> Department of Applied Physics
> University PhD Dissertation Defense
> Large Single-Molecule Fluorescence Enhancements Produced by Gold Bowtie
> Anika Amir Kinkhabwala
> Research Advisor: Professor William E. Moerner
11 June 2010 @3:15 p.m. (Refreshments at 3:00)
> Location: Applied Physics Building, Room 200
> Plasmonic nanoantennas can concentrate light beyond the diffraction limit
> and create highly enhanced local fields, leading to increased Raman
> scattering and, in some cases, increased fluorescence from nanoscale
> emitters. Gold bowtie nanoantennas provide a highly enhancing structure that
> is more controllable and amenable to integration than other geometries such
> as sharp metal tips and colloids. We have enhanced a single molecule's
> fluorescence by a factor of 1,300 by coupling it to a bowtie nanoantenna,
> ten times higher than previously reported for any other plasmonic structure.
> Electromagnetic simulations reveal that this enhancement is a result of
> greatly increased absorption of light as well as a shortened excited state
> lifetime, leading to enhancement of the intrinsic quantum efficiency by an
> estimated factor of nine, despite additional non-radiative ohmic losses.
> Measurements of enhanced single-molecule fluorescence for molecules both in
> rigid polymers and in solution show that bowtie nanoantennas can be used for
> high-contrast selection of single nanoemitters in crowded environments.
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