Optical FANO resonance with polarization independence with novel nano-antenna

摘要

Plasmonic Nano-systems have been investigated for the generation of Fano resonances with sharp dispersion for field enhancement at FANO resonance. Here, a novel tetrahedron arc-disk nano-antenna for optical Fano with polarization independence is suggested at infrared application. The special symmetrical form of structure is made independent of incident wave polarization. Here, for prototype nano antenna, the E-field enhancements at resonances are compared and design parameters effect on Fano resonance is debated. SiN Substrate selected with refractive index of 1.98 and gold with Palik optical characteristic used for modeling of the metal layer. The |E~2|/|E_(int)~2| increased more than 10,000 (V/m)~2 at Fano resonances and the parametric study shows the gap effects on FANO resonance controlling. As a result, by variation of the thickness of the arc element we are able to control the second resonance energy and achieved to a coupled formation. Subwavelength prototype structure is modified for FANO resonance and controlling at infrared regime.