Surface plasmon coupling for selectively enhanced random lasing in periodically patterned silver columnar thin film metamaterials

2020 
Periodically patterned sculptured plasmonic thin films, consisting of forests of nanocolumns of metals like silver on a periodic grating, offer a very rich landscape for light–matter interactions. Multiple light scattering, plasmonic resonances, anisotropy, hyperbolic dispersions, and Bragg scattering: a plethora of effects come together in these systems to offer various possibilities. We realize an efficient random laser by infiltrating a laser dye into such a grating of silver nanocolumns and optically pumping the system. The densely packed plasmonic nanocolumns provide feedback through efficient scattering, while the optically pumped dye solution in the voids provides for amplification. The periodicity and anisotropy provide for an angle and polarization selective enhanced coupling of the pump laser via the propagating surface plasmon resonances in the system.
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