Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 14, Issue 6, Pages 1441-1447Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2008.916755
Keywords
Bowtie nanoantenna; enhancement of fluorescence; local-field factor; low-pass filter; nonradiative power; orientizer; polarizer; quantum yield; radiative power; surface plasmon resonance (SPR)
Categories
Funding
- National Science Council, Taiwan, R.O.C. [NSC-95-2221-E-182-044]
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eA 2-D metallic bowtie nanoantenna, consisting of two nearby metallic nanotriangles and containing a molecule within the gap, is studied for the enhancement of a single emitter's spontaneous emission. For simplicity, a transverse-magnetic model is used for simulation and a set of new surface integral equations is developed for the calculation. The process of spontaneous emission is simply divided into two stages: the first stage is the excitation of the emitter irradiated by an incident plane wave and the second is the emission of the excited emitter. For the latter, the excited emitter is modeled as an electric dipole to interact with the nanoantenna. The results show that a metallic bowtie nanoantenna behaves as a nanolens as well as a polarizer to provide a strong local electric field with a polarization parallel to the axis of the bowtie in the gap for the emitter's excitation, and its quantum yield exhibits a function of a low-pass filter as well as an orientizer for the emitter's emission.
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