Abstract
In this work, we analyze modified bowtie nanoantennas with polynomial sides in the excitation and emission regimes. In the excitation regime, the antennas are illuminated by an incident plane wave, and in the emission regime, the excitation is fulfilled by infinitesimal electric dipole positioned in the gap of the nanoantennas. Several antennas with different sizes and polynomial order were numerically analyzed by method of moments. The results show that these novel antennas possess a controllable resonance by the polynomial order and good characteristics of near field enhancement and confinement for applications in enhancement of spontaneous emission of a single molecule.
Highlights
Nanoantennas are metal nanostructures used to enhance, confine, receive, and transmit optical fields [1]
Directivity and Efficiency in the Emission Regime we present the numerical results of the modified bowtie nanoantennas in the emission regime, where an infinitesimal electric dipole localized in the middle of the nanoantennas is the source of the antenna system (Fig. 1)
With the results presented we conclude that the modified bowtie nanoantennas with α>1 possess smaller radiation efficiency than that of the conventional one with α=1 and their directivities are equal to 1.5 at the principal resonances
Summary
Nanoantennas are metal nanostructures used to enhance, confine, receive, and transmit optical fields [1]. We present an analysis of Au modified bowtie nanoantennas in the excitation and emission regimes.
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