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Spectral Dependence of Fluorescence Enhancement in LH2-Au Nanoparticle Hybrid Nanostructures

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Bujak L., Brotosudarmo T., Czechowski N., Olejnik M., Ciszak K., Litvin R., Cogdell R., Heiss W., Mackowski S.

Acta Physica Polonica A

2012

vol. 122

issue 2

252-254

We report on the influence of plasmon resonance in spherical gold nanoparticles on the optical properties of light-harvesting complex LH2 from the purple bacteria Rhodopseudomonas palustris. Systematic studies as a function of the excitation energy and the separation distance indicate that metal enhanced fluorescence shows strong dependence upon both of these parameters. We observe substantial increase of the fluorescence from LH2 complex in a hybrid nanostructure with 12 nm silica spacer. On the other hand, the enhancement measured with laser tuned into the plasmon resonance is almost threefold compared to the off-resonance configuration. The enhancement of fluorescence intensity originates in both cases from the increase of carotenoid absorption in the LH2 complex.

Plasmon Enhancement of Fluorescence in Single Light-Harvesting Complexes from em Amphidinium carterae

81%

Bujak Ł., Piątkowski D., Mackowski S., Wörmke S., Jung C., Bräuchle C., Agarwal A., Kotov N., Schulte T., Hofmann E., Brotosudarmo T., Scheer H., Govorov A., Hiller R.

Acta Physica Polonica A

2009

vol. 116

issue S

S-22-S-25

We show that single peridinin-chlorophyll a-protein light-harvesting complexes from dinoflagellate Amphidinium carterae placed near to silver nanoparticles show strongly enhanced fluorescence emission. Single molecule spectroscopy experiments performed at room temperature point toward an enhancement of more than an order of magnitude for optimal conditions. Irrespective of the enhancement, we observe no effect of the metal nanoparticle on the fluorescence emission energy of the complex. This result provides a way to control the optical properties of biomolecules via plasmon excitations in metal nanoparticles.

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2 Acta Physica Polonica A

1 2012

1 2009

2 Brotosudarmo T.

2 Mackowski S.

1 Agarwal A.

1 Bräuchle C.

1 Bujak L.

1 Bujak Ł.

1 Ciszak K.

1 Cogdell R.

1 Czechowski N.

1 Govorov A.

1 Heiss W.

1 Hiller R.

1 Hofmann E.

1 Jung C.

1 Kotov N.

1 Litvin R.

1 Olejnik M.

1 Piątkowski D.

1 Scheer H.

1 Schulte T.

1 Wörmke S.

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Spectral Dependence of Fluorescence Enhancement in LH2-Au Nanoparticle Hybrid Nanostructures

Plasmon Enhancement of Fluorescence in Single Light-Harvesting Complexes from em Amphidinium carterae