Figure 4

The distribution of the electric field intensity |E|² of the optimal design of the Chand-Bali nano-antenna structure calculated at 10 μm. (a,b) At the center xy-plane, where the darker color represents higher electric field intensity, all plots at the same scale, and the arrows represent the electric field vector at the same resonance wavelength of 10 μm for (a) x-polarized incident electric field, and (b) y-polarized incident electric field, respectively. (c,d) The grey scale spectrum maps the magnetic field intensity cross-sections emphasizing the creation of magnetic resonances. The cross-section is cut parallel to xz-plane passes through the hot-spot gap in (c), while it is parallel to yz-plane and passes through the two hotspots in (d). (e) The reflectance at the resonance wavelength with varying the incident angle, θ, the absorbance is over 92% for incident angles up to 80°.