Low-loss and highly polarized emission from planar polymer waveguides.
The waveguiding properties and amplified spontaneous emission (ASE) of a blend of light-emitting gain-conjugated polymers were investigated. ASE-induced line narrowing occurs for excitation fluences larger than 100 microJ cm(-2), with a maximum optical-gain coefficient of 8 cm(-1). Energy transfer between the host and guest polymers, significantly reducing the self-absorption, leads to a loss coefficient of the waveguide as low as 0.3 cm(-1), which is believed to be the lowest value reported for active organic gain slabs and a highly polarized emission, with a polarization contrast up to 0.65. These results indicate that gain-conjugated polymer blends are state-of-the-art organic materials for lasing devices.
Camposeo
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National Nanotechnology Laboratory of CNR-INFM, Distretto Tecnologico ISUFI, Universitá di Lecce, Italy. andrea.camposeo@unile.it
Mele
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Persano
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Pisignano
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Cingolani
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