Fig. 2. (a) Photonic band structure in an array of NWs with length L = 900 nm and diameter D = 300 nm. Dispersion of modes contributing to the transmission and reflection spectra are shown for a square grating with pitch p = 600 nm (solid line) and for a rectangular grating with pitch p = 605 nm (dotted line). The light “line” is almost vertical in the current wavelength's range, having coordinate pkx/π ∼ 0.95, and is not show in the figure. The inset shows the electric field distribution demonstrating x- and y-polarization of the modes. (b) Linear field enhancement, expressed as the ratio of electric field intensity inside the structure to the incoming field power. The resonance red-shifts only for x-polarization similarly as predicted from the band structure.
