Investigated the Fano resonance in the nano ring arrangement

Field enhancement in Plasmonic and FANO mode at nano antennas are noticed recently, here, we are modeled a nano antenna for achieving Fano resonance and for this aim, we are made asymmetric formation in nano ring structure and studied the parametric effects on Fano resonance controlling. We have debated on E-field enhancements at resonances with comparison the parameters effect on Fano resonance energy. We show that the single ring has plasmonic mode and adding an inner ring made Fano resonance and shows that the energy in dark mode is increased drastically. Here, the study of the inner ring position is indicated that how the bright mode and dark mode have appeared in nano antenna. Figure of merit (FOM) is studied for different additional material effects on prototype structure and Δ(E) variation is noticed. The structure is modeled with FDTD simulation by the CST microwave studio and for substrate; we selected SiN with a thickness of 40 nm. Here for achieving dark mode energy, novel shape of the dual ring nano antenna is suggested for concentration of the energy in small point to increase the interaction between nano particle and bio-particle.