Lasing at the band edges of plasmonic lattices

摘要: We report room-temperature lasing in two-dimensional diffractive lattices of silver and gold plasmon particle arrays embedded a dye-doped polymer that acts both as waveguide gain medium. As compared to conventional dielectric distributed feedback (DFB) lasers, central question is how the underlying band structure from which emerges modified by much stronger scattering disadvantageous loss metal. use spectrally resolved back-focal plane imaging measure wavelength angle dependence emission below above threshold, thereby mapping structure. find that, for particles, strongly reference DFB lasers since strong gives large stop gaps. In contrast, particles scatter weakly absorb strongly, so thresholds are higher, but not modified. The experimental findings supported finite element Fourier modal method calculations single-particle strength lattice extinction.