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Published on: November 30, 2012
Thickness dependence of amplified spontaneous emission in low-absorbing organic waveguides
Eva M Calzado1, Manuel G Ramírez, Pedro G Boj
1Instituto Universitario de Materiales de Alicante (IUMA) and Unidad Asociada UA-CSIC, Universidad de Alicante, 03080-Alicante, Spain.
Abstract:
The effect of varying film thickness (h) on the amplified spontaneous emission (ASE) properties of 0.5 wt.% perylenediimide-doped polystyrene waveguides is reported. The threshold dependence on h, not previously investigated in detail, is analyzed in terms of the film absorption and photoluminescence, the confinement of the fundamental waveguide mode (TE0), and the presence of high-order modes. For h<400 nm 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 TE0 mode.
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