Figure 2
From: Broadband multiple responses of surface modes in quasicrystalline plasmonic structure

(a) The cross section of the photonic QC layer. The gray nano-cylinders of refractive index nβ are patterned in the quasicrystalline lattice with background index nα. (b) The Fourier transformation of the quasicrystalline cross section of (a) for Λ = 1 μm and d = 0.4Λ. The area of each circle is proportional to the spacial spectrum intensity. The circles marked blue are the first 231 reciprocal vectors chosen to be the base vectors.