Silver half-shell arrays with controlled plasmonic response for fluorescence enhancement optimization

Farcău, Cosmin; Aştilean, Simion
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p193110
Academic Journal
Regular arrays of interconnected silver half-shells (HSs) deposited on self-organized polystyrene microspheres are proposed as plasmonic substrates for metal-enhanced fluorescence. An emission enhancement of 28 times was demonstrated for Rose Bengal fluorophore placed at about 1 nm above HSs. The enhancement correlates with the spectral overlap between the fluorophore emission and the plasmonic resonance of the HSs, indicating a surface plasmon-coupled emission mechanism for the amplification. As the overlap can be easily tuned by controlling the diameter of underlying microspheres, such plasmonic structures could be relevant for building fluorescence-based sensing devices with optimized efficiency for any given fluorophore.


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