Abstract
The effect of varying film thickness () on the amplified spontaneous emission (ASE) properties of perylenediimide-doped polystyrene waveguides is reported. The threshold dependence on , not previously investigated in detail, is analyzed in terms of the film absorption and photoluminescence, the confinement of the fundamental waveguide mode (), and the presence of high-order modes. For and down to 150 nm, the ASE wavelength blueshifts, while the linewidth and threshold increase. The detrimental ASE operation in very thin films is due to the low absorption as well as to the poor confinement of the mode.
©2012 Optical Society of America
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