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Speaker: Vladimir Bulovic, Massachusetts Institute of Technology
Date: September 14, 2011
Event: Solid-State Lighting Science Workshop in Novel Emitters and Nanostructured Materials
The second part of the talk will show that one mirror and the J-aggregate active layer of the polariton laser microcavity can act as a critically coupled resonator, which can be used for scalable, tunable, and homogeneous enhancement of molecular fluorescence. The operation of this device, called a J-aggregate critically coupled resonator, is based on the excitonic energy transfer from a highly absorptive thin film of J-aggregating dye molecules positioned at the anti-node of an optical half-cavity to a overlaying film whose fluorescence is enhanced in this structure. A 20-fold enhancement in molecular fluorescence is demonstrated, with the role of optical interference, Förster energy transfer, and exciton diffusion quantitatively analyzed to optimize device geometry, which can be broadly useful in light emitting structures.