A light at the proper wavelength can lead the dye molecules to fluoresce. The surface plasmons are generated and amplified by energy transfer from the excited molecules to the gold core of the spaser. The plasmons are then converted into photons of visible light, which is eventually emitted as a laser radiation. he inner and the outer circles represent the gold core (14 nanometers) and the glasslike shell (44 nanometers), respectively.
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