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Average Plasmonic Enhancement of Molecules-Doped Au-NS@SiO2 on Fluorescence

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Abstract:

The average plasmonic enhancement of Au nanoshell (Au-NS) coated by a molecules-doped silica layer (Au-NS@SiO2) on molecular fluorescence is studied theoretically to estimate the overall performance of a large number of Au-NS@SiO2. Using Mie theory and dyadic Green's functions, analytical solutions of the excitation rate and the apparent quantum yield are obtained to calculate the enhancement factor of Au-NS@SiO2 on the fluorescence of a molecule with a specific orientation and location at a specific excitation wavelength λex and an emission wavelength λem. Subsequently, the average enhancement factor (AEF) is calculated by averaging all possible orientations and locations of the molecule. For example, AEF of Au-NS@SiO2 (a 3 = 50 nm t 2 = 15 nm, t 1 = 25 nm) is 4.544 for a NIR fluorescence at λex = 780 nm and λem = 820 nm. Our results show that Au-NS is a broadband enhancer for NIR fluorescence; the bandwidth and the peak depend on the core size and the thickness of Au shell.

Keywords: APPARENT QUANTUM YIELD; AVERAGE ENHANCEMENT FACTOR; DYADIC GREEN'S FUNCTION; MIE THEORY; NANOSHELL; NEAR-INFRARED FLUORESCENCE; NONRADIATIVE DECAY RATE; RADIATIVE DECAY RATE

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2011.4759

Publication date: 2011-09-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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