The absorption spectrums of grating-graphene periodic multilayer structure. ‘Layers’, number of graphene layers, which is the odd number between 2 and 26. The frequency ranges from 0 to 60 meV (approximately 14.5 THz). The figure inset is the reflections.
Yuan et al. Nanoscale Research Letters 2014 9:90 doi:10.1186/1556-276X-9-90