Resonant modal analysis and dual-mode tailoring in high refractive index contrast two-dimensional nanorod arrays

摘要： Resonant modal analysis and dual-mode tailoring in high refractive index contrast two-dimensional (2-D) nanorod arrays are proposed. The specific modes of the guided mode resonances (GMRs) excited by the 2-D nanorod arrays can be distinguished based on the equivalent medium theory (EMT) and the analysis of the electric/magnetic fields. The broadband reflection and enhanced transmission can be obtained by the tailoring between the resonant dual-mode of the 2-D nanorod arrays. It is shown that the 2-D nanorod arrays can support the excitation of the resonant dual-mode with low-quality factor (low-Q) TM0 and high quality factor (high-Q) TE0 modes on a reflection broadband. The coupling of the edges of the resonant dual-mode can be tailored to create the resonant transmission with polarization independence near 1.31 μm. By merely changing the angle of incidence, one can achieve triple transmission channels due to the interaction of the nondegenerate resonant dual-modes.