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Abstract
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Utilizing boundary integral method (BIM), we investigate molecular spontaneous emission rate enhancement in the vicinity of plasmonic nanoparticles of elliptical cross section. These types of nanoparticles can considerably enhance the molecule decay rate. The spontaneous emission rate can be modified by altering the aspect ratio of the elliptical nanoparticle, the background refractive index and nanoparticles material. It is shown that the decay rate can be enhanced by two or three orders of magnitude for dipole distances below 10 nanometers. The position of enhancement peaks can be adjusted in the investigated spectral range (400-1000 nm) by changing the aspect ratio of the nanoparticle or the refractive index of background medium and nanoparticles material. To validate our result, we use BIM method to calculate light scattering by a circular gold nanowire and compare it with analytical result. Then the effect of various parameters, including aspect ratio and material of nanoparticle and the background refractive index, on the decay rate is investigated.
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