Optics of Nanostructures:Optics of Nanostructures:Science, Technology, Science, Technology,

ApplicationsApplicationsSergey V. GaponenkoSergey V. Gaponenko

Institute of Molecular and Atomic Institute of Molecular and Atomic PhysicsPhysics

National Academy of Sciencs of National Academy of Sciencs of BelarusBelarus

Institute of Molecular and Institute of Molecular and Atomic PhysicsAtomic Physics

Established in 1992 (separated from the Inst. Physics)Staff: 160 total (30 Dr. of Sci, 70 Ph.D)Research topics:• Plasma physics and atomic spectroscopy• Molecular spectroscopy• Photobiophysics• Physics of nanostructures12 research laboratoriesJournal of Applied Spectroscopy publisher (since 1964)

Basic PrinciplesBasic Principles Photonic crystal ideologyPhotonic crystal ideology Quantum size effects in Quantum size effects in

semiconductor nanocrystalssemiconductor nanocrystals Surface enhanced optical processesSurface enhanced optical processes

Photonic crystalsPhotonic crystals

Nanoporous alumina Nanoporous alumina developed at BSUIRdeveloped at BSUIR

Anisotropic light scattering in Anisotropic light scattering in nanoporous materialsnanoporous materials

Lutich, Gaponenko, Gaponenko, Sokol, APL, 2003 Lutich, Gaponenko, Gaponenko, Sokol, APL, 2003 in pressin press

Quantum size effects in Quantum size effects in semiconductor semiconductor nanocrystalsnanocrystals

Absorption

Lumi

nesc

ence

inten

sity (

a.u.)

Abso

rptio

n (lg

I0/I)

Wavelength (nm)400 600 800

0

1

2

3

4

5

Luminescence

CdS:Mn nanocrystals

Light convertor for Si photodetectorsLight convertor for Si photodetectorsMain advantage versus organic luminophores:Main advantage versus organic luminophores:

high photostabilityhigh photostability

300 350 400 450 500 550 600 650 700 750 8000.0

0.5

1.0

1.5

2.0

Si-photodetector withUV sensitive coating

Phot

ocur

rent

(A)

Wavelength (nm)

Principal publicationsPrincipal publicationsA. Kapitonov, A. Stupak, E. Petrov, A. Kapitonov, A. Stupak, E. Petrov, S. Gaponenko, A.Rogach, A. S. Gaponenko, A.Rogach, A. Eychmueller. Photoluminescence Eychmueller. Photoluminescence of CdTe nanocrystals in aqueous of CdTe nanocrystals in aqueous solution. solution. J. Phys. Chem. 103, 10109 (1999).J. Phys. Chem. 103, 10109 (1999).

M.Artemyev, A.Bibik, L.Gurinovich, M.Artemyev, A.Bibik, L.Gurinovich, S.Gaponenko, U.Woggon. Evolution S.Gaponenko, U.Woggon. Evolution from individual to collective from individual to collective electron states in a quantum dot electron states in a quantum dot ensemble. ensemble. Phys. Rev. B 60,1504-1506 (1999)Phys. Rev. B 60,1504-1506 (1999)

M. Artemyev, L. Gurinovich, A. M. Artemyev, L. Gurinovich, A. Stupak, S. GaponenkoStupak, S. Gaponenko. . Luminescence of CdS Luminescence of CdS Nanoparticles Doped with MnNanoparticles Doped with Mn. . PPhys. stat. sol. (b) 224, 191 (2001)hys. stat. sol. (b) 224, 191 (2001)

Surface enhanced optical Surface enhanced optical processes processes

Enhanced Raman scattering Enhanced Raman scattering Enhanced PhotoluminescenceEnhanced Photoluminescence

Malashkevich et al, in pressMalashkevich et al, in press

400 500 600 700

5000

10000

15000

20000

25000

30000Eu luminescence enhancement

in presence of silver colloids

Wavelength (Nanometers)

Inten

sity

1

2

3

7% мол. Eu2O

3 1 - no Ag. 2 - 0,5 % AgNO

3.

3 - 5 % AgNO3.

High-sensitive SERS molecular High-sensitive SERS molecular analysysanalysys

Gaponenko, Gaiduk, Kulakovich et al. JETP Lett. 2001, 74, 324.

Basic TechnologiesBasic Technologies Electrochemical etchingElectrochemical etching Colloidal chemistryColloidal chemistry Sol-gel processesSol-gel processes High-energy plasma flow High-energy plasma flow

processesprocesses

Nanoporous aluminaNanoporous aluminaBSUIRBSUIR

CdSe nanocrystalsCdSe nanocrystals ССdTedTe nanocrystalsnanocrystals Gaponenko et al. Gaponenko et al. Gaponenko et al. Gaponenko et al.

J. Appl. Phys. 1995, J. Appl. Phys. 1995, JETP lett. 1998JETP lett. 1998 In cooperation with Belarussian Sate University

Colloidal crystalsColloidal crystalsPetrov, Bogomolov, Kalosha, Gaponenko, PRL Petrov, Bogomolov, Kalosha, Gaponenko, PRL

19981998cooperation with Russian Academy of Sciences

and Inst. Powder Metallurgy

Metal colloidsMetal colloids

High-energy plasma flow High-energy plasma flow processesprocesses

discharge durationdischarge duration — 100 — 100 150 150

sec;sec; peak currentpeak current— 50 — 50 120 kA; 120 kA; plasma velocityplasma velocity — (3 — (3 7)x10 7)x1066 cm/sec; cm/sec; electron densityelectron density — 10— 101616 10 101818 cm cm-3-3;; plasma temperatureplasma temperature — 2 — 2 4 eV 4 eV

Regular surface structures formed on silicon Regular surface structures formed on silicon waferwafer

TasksTasks• Novel luminophores and efficient light Novel luminophores and efficient light

emitting devicesemitting devices

• Spectral transformers for silicon solar cells Spectral transformers for silicon solar cells and photodetectorsand photodetectors

• Ultrasensitive chemical analysisUltrasensitive chemical analysis

• Si surface processingSi surface processing

Optical data coding and security Optical data coding and security systemssystems

Spectral portraits of numbersSpectral portraits of numbers

Current projectsCurrent projects National program “Electronics”National program “Electronics” National program “Nanotechnologies”National program “Nanotechnologies” National program “Plasma dynamics”National program “Plasma dynamics” National Basic Res. Fnd. Projects (5)National Basic Res. Fnd. Projects (5) International INTAS projects (2 projects)International INTAS projects (2 projects) NATO for Peace projectNATO for Peace project Int. Sci. Techn. Center projectInt. Sci. Techn. Center project Volkswagen Shiftung projectVolkswagen Shiftung project Cooperaton agreement with Swiss Sherer InstituteCooperaton agreement with Swiss Sherer Institute European network of excellence “Nanophotonics”European network of excellence “Nanophotonics”