1. Giant Rabi splitting in metal/semiconductor nanohybrids
J. Bellessa, C. Symonds, J.C. Plenet, A. Lemaitre, K. Vinck, D. Felbacq
Laboratoire de Physique de la Matière Condensée et Nanostructure, Lyon, France
Laboratoire de Photonique et Nanostructures, Marcoussis, France
Groupement d’Etude des Semiconducteurs, Montpellier, France

2. Outline Properties of surface plasmons
Description of surface plasmons
Plasmons in strong coupling
Hybridisation localised plasmon/exciton
Localised plasmon in nanodisks
Nanodisks with organic semiconductor
Particularities of the hybrid states
Inhomogeneous broadenings
Geometrical effects
Conclusion

3. Surface plasmon Interface metal / dielectric material
Properties of surface plasmons
Surface plasmon
Interface metal / dielectric material
Dielectric
Metal
100nm
20nm
W. L. Barnes et al., Nature, 418, 306 (2002) 2D
1D plasmon guide
0D nanoparticules
Damping in the metal

4. Delocalised plasmon in strong coupling
Properties of surface plasmons
Delocalised plasmon in strong coupling
Weak coupling : Luminescence enhancement with nanoantennas
D.E. Gomez et al. Nano Lett (2010)
Strong interaction between plasmons and :
Aggregated dyes
Laser dyes such as Rhodamine 6G
Semiconductor nanocrystals arrays : CdSe dots under a thin silver film
Rabi splitting of 112 meV
T.K. Hakala et al. PRL (2009)
J. Bellessa, C. Bonnand, J.C. Plenet, J. Mugnier., PRL 93, (2004)

5. Plasmon in strong coupling
Properties of surface plasmons
Plasmon in strong coupling
Plasmons in nanoshells
Metallic nanostructures
Holes and voids in metallic structures
GOLD
N. T. Fofang et al. Nanoletters (2008)
J. Dintinger et al. Phys. Rev. B 71, (2005)
Y. Sugawara et al. PRL 97, (2006)

6. Localised plasmons Discrete Plasmon resonance
Hybridisation localised plasmon/exciton
Localised plasmons
Ag Nanodisks
control of the environment and size
Discrete Plasmon resonance
Distance between the disks 200nm
Low inhomogeneous broadening
300nm

7. Bare plasmon resonances
Hybridisation localised plasmon/exciton
Bare plasmon resonances
Transmission of nanodisks
Plasmon resonances
energy : size dependant
linewidth 150meV
No plasmon overlapping

8. Nanodisks with TDBC Nanodisks covered with a TDBC layer
Hybridisation localised plasmon/exciton
Nanodisks with TDBC
Nanodisks covered with a TDBC layer
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Absorption (a. u.)
Transmission
Energy (eV)
121 nm
143 nm
111 nm
(b)
(a)
Three transmission dips
TDBC absorption
two size dependant dips
Uncoupled regions Bare TDBC

9. Two levels model Formation of localised plasmon/ exciton mixed states
Hybridisation localised plasmon/exciton
Two levels model
Formation of localised plasmon/ exciton mixed states
Eplasmon
Eexciton ħW

10. Formation of polaritons
Hybridisation localised plasmon/exciton
Formation of polaritons
Rabi splitting depends on TDBC thickness
FDTD simulations
Rabi energy meV
20% of the transition energy
1 TDBC layer
2 TDBC layers
(b)
Nanodisk diameter (nm)
100
120
140
160
180
200
220
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
Energy (eV)
2.5
2.4
2.3
2.2
2.1
450meV
Energy (eV)
2.0
1.9
1.8
1.7
1.6
100
120
140
160
180
200
220
Nanodisk diameter (nm)
J. Bellesa et al. Phys. Rev. B 80, (2009)

11. Homogeneous and inhomogeneous broadenings
Particularities of the hybrid states
Homogeneous and inhomogeneous broadenings
In microcavities
In nanoparticles N
photon
Excitons
N. F. Fofang et al. Nanolett. 2008, 8 (10), 3481 N ?
exciton
plasmons
ERabi<ginhomogène
Strong coupling

12. Distance between disks
Particularities of the hybrid states
Distance between disks
Large modification of the bare plasmons
Diffractive effects
Rabi energy roughly unchanged

13. Conclusion Localized plasmon/exciton hybridization
Rabi splitting of 450 meV (20% transition energy)
Model system for cylindrical nanoparticles with controlled size and environment