摘要
This work both numerically and experimentally investigates reflectance spectra from a metallic compound grating and its alternative sets of componential gratings at wavelengths between 2.5 and 25 μm. The numerical algorithm is based on the rigorous coupled-wave analysis, and the specular reflectance is measured with Fourier-transform infrared spectrometry. The impact dominance of each componential grating on the compound grating reflectance is thoroughly discussed considering the incidence polarization, grating geometry, and rules for profile synthesis. Tailored spectra by individual Wood's anomaly and their interplay associated with the profile synthesis are also studied. © 2010 Optical Society of America.