Design of optical wide-band log-periodic nanoantennas using surface integral equation techniques

In this paper we propose the design of plasmonic nanoantennas for optical applications with high directivity patterns in a wide bandwidth. The design is supported by surface integral equation (SIE) formulations solved by the method of moments (MoM). Although not widely used until now in optics, this solution brings important advantages compared with usual volumetric approaches. We will demonstrate through numerical computations that almost frequency independent directivity patterns can be obtained over a large bandwidth for judiciously designed log-periodic nanoantennas.