Experimental performance of plasmonically enhanced...
Transcript of Experimental performance of plasmonically enhanced...
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2328-23
Preparatory School to the Winter College on Optics and the Winter College on Optics: Advances in Nano-Optics and Plasmonics
S.V. Gaponenko
30 January - 17 February, 2012
Stepanov Institute of Physics MinskBelarus
Experimental performance of plasmonically enhanced luminescence and Raman scattering
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Experimental performance of plasmonically enhanced
luminescence and Raman scattering
S. V. GaponenkoB. I. Stepanov Institute of Physics,
National Academy of Sciences of Belarus
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Outline
• Photoluminescence enhancement• Raman scattering enhancement• Rayleigh scattering enhancement
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Photoluminescence enhancement
• Molecules• Quantum dots• Rare-earth ions
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I(ω΄) = I0(ω) [interaction term] D(ω΄)
Field DensityEnhancement of States EffectsFactor
Spatial redistribution Spatial redistributionof EM-field for ω of EM-field for ω΄
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Field +metal body Metal body +molecule
2
20
, ,, , , ,
, ,rad
rad nonrad
F G Q
E r rr r r
r rE
High quantum yield F = 1…50
Low quantum yield F > 1000! - biomicroscopy!
Intensityenhancement
Quantum yield
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General recipePut a liminescent object (atom, molecule,
quantum dot) in a position where:- excitation radiation is enhanced- photon DOS for emission spectrum is
enhanced- non-radiative rate enhancement does not
overtake the 2 above enhancement factors
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Surface enhanced luminescence
• Optimal metal surface structure:- chemical colloidal technigues- physical deposition techniques + annealing- nanolithography + deposition
• Optimal metal—luminophore spacing:- Langmuir—Blodgett films- polyelectrolyte films- Vacuum deposition of dielectric film
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O.Kulakovich, N.Strekal, M.Artemyev, A.Stupak, S.Maskevich, S.Gaponenko.
Nanotechnology 17,5201 (2006)
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Tip-enhanced spectroscopy
Anger, Bharadwaj, Novotny PRL 2006 96 113002
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SolidsNanocrystals
ClustersAtoms
Number of atoms 3-102 102 –106 >106
Semiconductor nanocrystals
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E3
E2
E1
E
a
Ev
v alen ce band
co n d u ctio n b an d
Ec
Eg
b an d g apen ergy
Ener
gy E
c o o rd in a te x
Quantum confinement effects
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Size-dependent absorption and emission spectra
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Bruchez, M. Moronne, M., Gin, P., Weiss, S., Alivisatos, A.P. Semiconductor nanocrystals as fluorescent biological labels.
Science 281, p.2013-2016 (1998).
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In 2002 two groups reported first results on QD PL enhancement :Shimizu,K.T., Woo,W.K., Fisher,B.R., Eisler,H.J. &Bawendi, M.G. Surface-enhanced emission from singlesemiconductor nanocrystals.Phys. Rev. Lett. 89,117401(2002).
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30-fold QD PL enhancement reported
Pompa et al, Nature Nanotechnology 2006 1 126
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ACS NANO 2011v. 5, p.1328–1334.
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Svetlana Serezhkina, Minsk, PhD Thesis, 2006
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Eu luminescence enhancement in presence of silver colloids
Wavelength (Nanometers)
Inte
nsity
1
2
3
7% мол. Eu2O
3
1 - no Ag. 2 - 0,5 % AgNO
3.
3 - 5 % AgNO3.
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Raman scattering enhancement
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2006
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Klyachkovskaya et al. Plasmonics, 2011, 6, 413; J. Raman. Spectr. 2012
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Summary• Photoluminescence can be enhanced by 1-2 orders
of the magnitude (ensemble averaged) and can be used in fluorescence labelling and novel luminophores
• Raman scattering can be enhanced for individual molecules up to 1014 times and about 106 averaged