Journal
PHYSICAL REVIEW B
Volume 85, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.125429
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Funding
- German Federal Ministry of Education and Research (PhoNa)
- Thuringian State Government (MeMa)
- German Science Foundation [SPP 1391]
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An analytical approach is provided for describing the resonance properties of optical nanoantennas made of a stack of homogeneous disks, i.e., circular patch nanoantennas. It consists in analytically calculating the phase accumulation of surface plasmon polaritons across the resonator and an additional contribution from the complex reflection coefficient at the antenna termination. This makes the theory self-contained with no need for fitting parameters. The very antenna resonances are then explained by a simple Fabry-Perot resonator model. Predictions are compared to rigorous simulations and show excellent agreement. Using this analytical model, circular antennas can be tuned by varying the composition of the stack.
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