Abstract

The enhancement of the electromagnetic field is described for nanoscale metallic ``bowtie'' antennas, consisting of two opposing tip-to-tip Au nanotriangles separated by a gap, through simulation and experiment. Currents, field distributions, and scattering efficiencies in the antennas at optical wavelengths are obtained from finite-difference time-domain (FDTD) simulations using realistic wavelength-dependent dielectric constants. The experimentally measured resonant wavelengths and intensity enhancements from individual bowtie antennas are in excellent agreement with the FDTD simulations. A simple physical model based on current distribution in the antennas is presented to understand the variation in resonant wavelength with gap and explain the basis for the field enhancement.

Keywords

Finite-difference time-domain methodWavelengthDielectricScatteringField (mathematics)OpticsPhysicsResonance (particle physics)Electromagnetic fieldNanoscopic scaleMaterials scienceOptoelectronicsComputational physicsAtomic physics

Affiliated Institutions

Related Publications

Publication Info

Year
2005
Type
article
Volume
72
Issue
16
Citations
261
Access
Closed

External Links

View on DOI.org

Social Impact

Altmetric
PlumX Metrics

Social media, news, blog, policy document mentions

Citation Metrics

261
OpenAlex

Cite This

Arvind Sundaramurthy, Kenneth B. Crozier, G. S. Kino et al. (2005). Field enhancement and gap-dependent resonance in a system of two opposing tip-to-tip Au nanotriangles. Physical Review B , 72 (16) . https://doi.org/10.1103/physrevb.72.165409

Identifiers

DOI
10.1103/physrevb.72.165409