Abstract

Nanoantennas are optical wave radiating structures operating based on the same physical principles as those underlying their radio-frequency counterparts. However, the physical properties of materials in the optical range of frequency cause different response to the incident electromagnetic field leading to novel applications in optics. The conventional methods for the analysis and design of antennas need to be modified for these structures. In this paper, an integral equation formulation using the complex images Green's function technique is employed to model the optical wave interactions with nanoantennas embedded in multilayer media. The developed method is combined with the simulated annealing algorithm to design and optimize structures composed of strongly coupled nanoscale scatterers. It is shown that not only can they lead to improved efficiency in optical devices, but also orthogonal transmission channels are attainable when they are excited properly. The latter provides a new scheme for encoding and multiplexing signals in optical information systems.

© 2016 IEEE

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