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Size dependence of molecular fluorescence enhancement of nanoporous gold

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5 Author(s)
Lang, X.Y. ; WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan ; Guan, P.F. ; Zhang, L. ; Fujita, T.
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We report molecular fluorescence enhancement of free-standing nanoporous gold with tunable nanopore size. The fluorescence intensity of indocynanine green adsorbed on human-serum-albumin-coated nanoporous gold films significantly increases with decreasing nanopore size. The large fluorescence enhancement results from the near-field enhanced excitation and radiative decay rate of fluorophore due to the strong electromagnetic fields produced by nanosized curvatures as well as the coupling between the neighbor gold ligaments.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 7 )