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(a) Schematic illustration of the random laser consisting of Au-NPs immobilized on a glass substrate, PVP spacer layer and MEH-PPV-F8BT polymer composite layer. (b) Atomic force microscopy image of Au-NPs immobilized on the sample. Inset shows a higher magnification of Au-NPs.
Spectral overlap of the surface plasmon resonance of bare Au-NPs (B, dash dot, blue) and PVP covered Au-NPs (C, short dash, green) with excitation (A, dash, orange) and emission (D, solid, red) spectra of polymer.
The emission of random laser without any spacer layer excited by 4μJ laser light at 532 nm. Inset shows the emission intensity as a function of the pump energy.
Evolution of the random laser emission spectra as a function of pump energy for a sample with average spacer layer of 15 nm. Emission modes (narrow spikes) of random laser were increased in comparison to the laser without any spacer layer.
(a) Laser emission intensity as a function of pump energy for random laser without spacer layer (circle, black) and with PVP spacer layer of 15 nm (square, green) and 30 nm (triangle, red). (b) Emission intensity as a function of pump energy for the random laser with average spacer layer of 30 (triangle, red), 50 (square, royal blue), and 70 nm (circle, brown).
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