Circular Optical Nanoantennas: An Anlytical Theory

Details Circular Optical Nanoantennas: An Anlytical Theory Circular Optical Nanoantennas: An Anlytical Theory

2011-07-25

arxiv.org/abs/1107.4934v2

Physical Review B 85, 125429 (2012)

Physics

Optics

Scientific paper

10.1103/PhysRevB.85.125429

An entirely analytical theory is provided for describing the resonance properties of optical nanoantennas made of a stack of homogeneous discs, 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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