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Angular shaping of fluorescence from synthetic opal-based photonic crystal.

Boiko V, Dovbeshko G, Dolgov L, Kiisk V, Sildos I, Loot A, Gorelik V - Nanoscale Res Lett (2015)

Bottom Line: Fluorescence intensity increases up to two times at the edges of the spectral dip.Partial photobleaching of fluorescence was observed.Photonic origin of the observed effects is discussed.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics of Biological System, Institute of Physics, NAS of Ukraine, Prospect Nauki 46, Kyiv, 03680 Ukraine.

ABSTRACT
Spectral, angular, and temporal distributions of fluorescence as well as specular reflection were investigated for silica-based artificial opals. Periodic arrangement of nanosized silica globules in the opal causes a specific dip in the defect-related fluorescence spectra and a peak in the reflectance spectrum. The spectral position of the dip coincides with the photonic stop band. The latter is dependent on the size of silica globules and the angle of observation. The spectral shape and intensity of defect-related fluorescence can be controlled by variation of detection angle. Fluorescence intensity increases up to two times at the edges of the spectral dip. Partial photobleaching of fluorescence was observed. Photonic origin of the observed effects is discussed.

No MeSH data available.


Related in: MedlinePlus

Photobleaching of photonic crystal fluorescence in time. Unequal kinetics of blue and red fluorescence is illustrated on the example of 450 nm (1) and 650 nm (2) spectral bands excited by steady laser irradiation at 266 nm. Images of the fluorescent spot on the surface of sample 2 in the initial and bleached states are shown in the inset.
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Fig8: Photobleaching of photonic crystal fluorescence in time. Unequal kinetics of blue and red fluorescence is illustrated on the example of 450 nm (1) and 650 nm (2) spectral bands excited by steady laser irradiation at 266 nm. Images of the fluorescent spot on the surface of sample 2 in the initial and bleached states are shown in the inset.

Mentions: The fluorescence emission from photonic crystals is subject to partial photobleaching. The brightness of fluorescence at the laser spot incident on the sample surface decreases essentially during the first minutes of irradiation and then changes more gradually (Figure 8). The blue fluorescence band with the maximum at 450 nm is bleaching faster than the red band with the maximum at 650 nm. As a consequence, fluorescence acquires a reddish tint at a longer exposure of the sample to UV light (Figure 8, inset).Figure 8


Angular shaping of fluorescence from synthetic opal-based photonic crystal.

Boiko V, Dovbeshko G, Dolgov L, Kiisk V, Sildos I, Loot A, Gorelik V - Nanoscale Res Lett (2015)

Photobleaching of photonic crystal fluorescence in time. Unequal kinetics of blue and red fluorescence is illustrated on the example of 450 nm (1) and 650 nm (2) spectral bands excited by steady laser irradiation at 266 nm. Images of the fluorescent spot on the surface of sample 2 in the initial and bleached states are shown in the inset.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385143&req=5

Fig8: Photobleaching of photonic crystal fluorescence in time. Unequal kinetics of blue and red fluorescence is illustrated on the example of 450 nm (1) and 650 nm (2) spectral bands excited by steady laser irradiation at 266 nm. Images of the fluorescent spot on the surface of sample 2 in the initial and bleached states are shown in the inset.
Mentions: The fluorescence emission from photonic crystals is subject to partial photobleaching. The brightness of fluorescence at the laser spot incident on the sample surface decreases essentially during the first minutes of irradiation and then changes more gradually (Figure 8). The blue fluorescence band with the maximum at 450 nm is bleaching faster than the red band with the maximum at 650 nm. As a consequence, fluorescence acquires a reddish tint at a longer exposure of the sample to UV light (Figure 8, inset).Figure 8

Bottom Line: Fluorescence intensity increases up to two times at the edges of the spectral dip.Partial photobleaching of fluorescence was observed.Photonic origin of the observed effects is discussed.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics of Biological System, Institute of Physics, NAS of Ukraine, Prospect Nauki 46, Kyiv, 03680 Ukraine.

ABSTRACT
Spectral, angular, and temporal distributions of fluorescence as well as specular reflection were investigated for silica-based artificial opals. Periodic arrangement of nanosized silica globules in the opal causes a specific dip in the defect-related fluorescence spectra and a peak in the reflectance spectrum. The spectral position of the dip coincides with the photonic stop band. The latter is dependent on the size of silica globules and the angle of observation. The spectral shape and intensity of defect-related fluorescence can be controlled by variation of detection angle. Fluorescence intensity increases up to two times at the edges of the spectral dip. Partial photobleaching of fluorescence was observed. Photonic origin of the observed effects is discussed.

No MeSH data available.


Related in: MedlinePlus