Silver nanostructure sensing platform for maximum-contrast fluorescence cell imaging

KM Lee, A Neogi, P Basu Neogi, M Kim… - Journal of …, 2011 - spiedigitallibrary.org
KM Lee, A Neogi, P Basu Neogi, M Kim, B Kim, R Luchowski, Z Gryczynski, N Calander…
Journal of Biomedical Optics, 2011spiedigitallibrary.org
We present herein a silver nanostructure-assisted sensing platform which consists of a
combined structure of Ag nanowire (NW) and nanodot (ND) array. Highly enhanced
fluorescence from fluorophore is attributed to a strongly coupled optical near-field interaction
between proximately located Ag NW and NDs. We obtained enhanced fluorescence
intensity with up to 140 folds, as contrasted from background intensity, reaching a theoretical
maximum value. On the other hand, fluorescence lifetime was greatly reduced to 0.27 ns …
We present herein a silver nanostructure-assisted sensing platform which consists of a combined structure of Ag nanowire (NW) and nanodot (ND) array. Highly enhanced fluorescence from fluorophore is attributed to a strongly coupled optical near-field interaction between proximately located Ag NW and NDs. We obtained enhanced fluorescence intensity with up to 140 folds, as contrasted from background intensity, reaching a theoretical maximum value. On the other hand, fluorescence lifetime was greatly reduced to 0.27 ns (from 2.17 ns for the same fluorophores without nanostructure). This novel platform can be a promising utility for optical imaging and labeling of biological systems with a great sensitivity.
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