Figure 5: Dependence of the k-space beating pattern on the array size.
From: Lasing in dark and bright modes of a finite-sized plasmonic lattice
(a) Normalized constant energy crosscut of the dark mode lasing peak as a function of in-plane k-vector for different array sizes. (b) The separation of the peaks in a as a function of 1/(array size). The separation of the lasing peaks for 100 and 50 μm array corresponds to angular separation of 0.44° and 0.74°, respectively. Divergence of individual peaks vary between 0.29° and 0.44°. (c) The lasing spectra for each array size integrated over the double peak from k=−0.2 to k=0.2 μm−1. The threshold fluence Pth depends on the array size. The linewidth of the lasing peak is denoted on the left and Pth on the right.
