Abstract
The amplified spontaneous emission (ASE) threshold reduction of R6G/PMMA film with a quasi-waveguide structure was observed by doping core–shell Ag nanocube@SiO2. When the SiO2 shell thickness was only 3 nm, the ASE threshold declined from 0.8 to 0.2 mJ cm−2, presenting a large decreased ratio of 75%. With the enhancement of the emission intensity, the pulse width of the ASE spectra also narrowed from 8 to 6.8 nm after doping. An efficient coupling between the R6G media and Ag nanocube through the proper ultrathin spacer was concluded as the main reason for such phenomena.
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