Quality Factor of a Nanobowtie Antenna

We present a rigorous formulation based on the Poynting's theorem in dispersive and lossy media to calculate the quality factor, material loss, radiation loss, and radiation pattern of an optical nanobowtie antenna using the finite-difference time-domain method. The quality factor obtained from...

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Bibliographic Details
Published in:Journal of lightwave technology 2011-10, Vol.29 (20), p.3107-3114
Main Authors: Ni, Chi-Yu Adrian, Shu-Wei Chang, Shun Lien Chuang, Schuck, P. James
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Bowtie antenna
Cavity resonators
Chromium
Dispersion
Exact sciences and technology
finite-difference-time-domain method (FDTD)
Gold
Materials
Q factor
quality factor
Radiocommunications
Telecommunications
Telecommunications and information theory
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Summary:We present a rigorous formulation based on the Poynting's theorem in dispersive and lossy media to calculate the quality factor, material loss, radiation loss, and radiation pattern of an optical nanobowtie antenna using the finite-difference time-domain method. The quality factor obtained from our theory, 8.73, agrees well with the experimental data. Our results show that the radiation loss and material loss are comparable. The material loss mainly originates from the chromium rather than gold even though the nanobowtie antenna mostly consists of gold. In addition, due to the small gap and plasmonic mode confinement, the effective modal volume is ultrasmall [6.36 × 10 -5 (λ/ n eff ) 3 ], which significantly breaks the diffraction limit.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2011.2164780