Results found: 3

Number of results on page

Search results

Sort By:

Limit search:

Fluorescence Mapping of PCP Light-Harvesting Complexes Coupled to Silver Nanowires

100%

Krajnik B., Piatkowski D., Olejnik M., Czechowski N., Hofmann E., Heiss W., Mackowski S.

Acta Physica Polonica A

2012

vol. 122

issue 2

259-262

In this work we demonstrate confocal fluorescence imaging of hybrid nanostructures composed of silver nanowires and peridinin-chlorophyll-protein light-harvesting complexes. The length of silver nanowires, which reaches 10 μm, allows for determination of the nanowire position and consequently direct correlation with the fluorescence image. In this way we probe the influence of plasmon induced electromagnetic field on the fluorescence of light-harvesting complexes. When the nanowires are spaced from the light-harvesting complexes by a 10 nm thick dielectric layer, we observe a fluorescence enhancement, which depends upon the laser excitation wavelength. The measured enhancement values are 2.5 and 1.9 for 405 nm and 485 nm, respectively. Larger enhancement for the 405 nm excitation is attributed to direct creation of plasmon excitations in the silver nanowires.

Fluorescence Microscopy of Corrole-Single Silver Nanowire Hybrid Nanostructures

100%

Czechowski N., Olejnik M., Nowak-Król A., Piątkowski D., Heiss W., Gryko D., Mackowski S.

Acta Physica Polonica A

2012

vol. 122

issue 2

333-336

We report on confocal microscopy imaging of hybrid nanostructures composed of silver nanowires and corroles. Both nanomaterials were separated by a 30 nm thick SiO_2 spacer in order to inhibit fluorescence quenching. The results show that for such a hybrid nanostructure the average enhancement of the fluorescence intensity reached 2.5. Importantly, the coupling to plasmon excitations in metallic nanowires leaves no effect on the fluorescence spectrum of the organic molecules.

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

84%

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.

Refine search results

3 Acta Physica Polonica A

3 2012

3 Czechowski N.

3 Heiss W.

3 Mackowski S.

3 Olejnik M.

1 Brotosudarmo T.

1 Bujak L.

1 Ciszak K.

1 Cogdell R.

1 Gryko D.

1 Hofmann E.

1 Krajnik B.

1 Litvin R.

1 Nowak-Król A.

1 Piatkowski D.

1 Piątkowski D.

Search results

Fluorescence Mapping of PCP Light-Harvesting Complexes Coupled to Silver Nanowires

Fluorescence Microscopy of Corrole-Single Silver Nanowire Hybrid Nanostructures

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