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Matteo BurresiMatteo BurresiGiacomo CerrettiLorenzo CorteseRajesh KumarRajesh KumarJean-Christ. LavocatJean-Christ. LavocatDaniele MartiriDaniele MartiriCamilla ParmegCamilla ParmeggianigianiFilippo PratesiFilippo PratesiFrancesco RiboliFrancesco Riboli
Francesca IntontiFrancesca IntontiMassimo GurioliMassimo GurioliStefano LepriStefano LepriCostanza Toninelli Costanza Toninelli Stefano CavalieriStefano CavalieriMarcello ColocMarcello Coloccici
TomTomas Svenssonas SvenssonRomolo SavoRomolo SavoKevin VynckKevin VynckHao ZengHao Zeng
Jacopo BerlotottiJacopo BerlotottiSilvia VignoliniSilvia Vignolini
INO-CNR and LENS-Univ. Firenze, Sesto Fiorentino INO-CNR and LENS-Univ. Firenze, Sesto Fiorentino
www.lens.unifi.itwww.lens.unifi.it
Diederik S. WiersmaDiederik S. Wiersma
Trapping the Light Fantastic
European Laboratory for Non-linear SpectroscopyEuropean Laboratory for Non-linear Spectroscopy (LENS)
Energy and Light
Easy and clean nuclear energy
Harvest solar energy that reaches the earth
Solar cell
Standard Silicon solar cell
Photonics for solar energy
Optics of complex systems
Light transport in dielectric materials
Disordered Partially ordered Ordered
Powders Porous materials
Liquid crystals Quasi crystals
Photonic crystals
Understanding light propagation
?
?
Understanding light propagation
?
?
Photonic crystalPhotonic crystal
Understanding light propagation
?
?
Photonic glass
Trapping light in thin films
Trapping light in thin films
v v vv
vvv
Plasmon resonances – field enhancement
Trapping light in thin films
v
Surface roughness – scramble directions
!!
Trapping light in thin films
Trapping light in thin films
Trapping light with disorder?
Transport in disordered materials
Physics Today, August issue (2009)
Random materials
Average step (mean free path)ℓ
(Brownian motion)
Light waves perform random walk
Diffusion process: D=13
v ℓwith ⟨ x2⟩=D⋅t γ
Lévy glass
• Lévy flight from multiple scattering on TiO2 particles
Nature 453, 498 (May 22, 2008)
Interference effects
Speckle pattern in intensity distribution
Anderson localization
Nature 390, 671 (1997) Nature Physics 4, 359 (2008)
Very strongly scattering materials
k ℓ1
k ℓ : disorder parameter
Anderson localization in 2D
Light waves trapped in 2D planar structure
In-plane distribution light intensity
Out-of-plane coupling
Preliminary experimental data
Matteo BurresiMatteo BurresiGiacomo CerrettiLorenzo CorteseRajesh KumarRajesh KumarJean-Christ. LavocatJean-Christ. LavocatDaniele MartiriDaniele MartiriCamilla ParmegCamilla ParmeggianigianiFilippo PratesiFilippo PratesiFrancesco RiboliFrancesco Riboli
Francesca IntontiFrancesca IntontiMassimo GurioliMassimo GurioliStefano LepriStefano LepriCostanza Toninelli Costanza Toninelli Stefano CavalieriStefano CavalieriMarcello ColocMarcello Coloccici
TomTomas Svenssonas SvenssonRomolo SavoRomolo SavoKevin VynckKevin VynckHao ZengHao Zeng
Jacopo BerlotottiJacopo BerlotottiSilvia VignoliniSilvia Vignolini
INO-CNR and LENS-Univ. Firenze, Sesto Fiorentino INO-CNR and LENS-Univ. Firenze, Sesto Fiorentino
www.lens.unifi.itwww.lens.unifi.it
Diederik S. WiersmaDiederik S. Wiersma
Trapping the Light Fantastic
