Directly Imprinted Surface-Emitting Distributed Feedback Structure Polymer Sensor Laser Devices for Enhanced Oxygen Sensitivity

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We report on a gas detection enhancement by means of amplified spontaneous emission (ASE) as well as laser emission from the conjugated polymer poly[(2-methoxy-5(2-ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH-PPV). Upon photo-pumping of spin-cast films, ASE was achieved. Periodic distributed feedback (DFB) structures were fabricated directly in the active polymer layer using the soft-lithographic technique of liquid imprinting. When the structured DFB grating was photo-pumped, laser emission was observed perpendicular to the substrate surface. For both, ASE as well as lasing, we monitored the output emission intensities under the influence of argon and ambient atmosphere resulting in a change in their threshold behavior. We clearly show that these changes are by virtue of a sensitivity enhancement resulting from oxygen acting as reversible quenching defect.
2008-01-25