Effect of nonlinearity on wave scattering and localization. Yuri S. Kivshar

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1 Effect of nonlinearity on wave scattering and localization Yuri S. Kivshar Nonlinear Physics Centre, Australian National University, Canberra, Australia St. Petersburg University of Information Technologies, Mechanics & Optics, Russia

2 Costas in APS journals Search Soukoulis + xxx (full text) Anderson localization 55 Disorder Photonic crystals Metamaterials Nonlinear 24 Solitons - 10

3 Outline of today s talk Back to 1988 Disorder and nonlinearity Bistability of Anderson states Photonic crystals & Fano resonances Nonlinear metamaterials Self-trapped localized beams

4 Outline of today s talk Back to 1988 Disorder and nonlinearity Bistability of Anderson states Photonic crystals & Fano resonances Nonlinear metamaterials Self-trapped localized beams

5 Back to 1988 Yu.K. et al, Phys Lett A 125, 35 (1987) St. Pnevmatikos ( )

6 Suppression of Anderson localization Linear scattering Nonlinear scattering

7 Experimental demonstration

8 Outline of today s talk Back to 1988 Disorder and nonlinearity Bistability of Anderson states Photonic crystals & Fano resonances Nonlinear metamaterials Self-trapped localized beams

9 Localized states in disordered structures x x exp 0 loc Anderson 1951 random dielectric medium Azbel 1983 What nonlinearity does to such a resonance? barrier cavity barrier Bliokh et al. 2004

10 618.9nm Bistable transmission

11 Outline of today s talk Back to 1988 Disorder and nonlinearity Bistability of Anderson states Photonic crystals & Fano resonances Nonlinear metamaterials Self-trapped localized beams

12 Photonic Crystals

13 Waveguide + defect coupling How can we use optical resonators to control light? 1 m Interference between different photon pathways Bandwidth modulation with small refractive index variation ( n/n<10-4 )

14 Fano resonance U. Fano, Effects of configuration interaction on intensities and phase shifts, Phys. Rev. 124, 1866 (1961) Ranked #3 in Top-100 Phys. Rev. articles! Ugo Fano ( ) ε = ω ω / Γ 2 0 F ε = ε+ f 2 ε First published in Nuovo Cimento in 1935

15 Gustav Mie, Mie resonances

16 Outline of today s talk Back to 1988 Disorder and nonlinearity Bistability of Anderson states Photonic crystals & Fano resonances Nonlinear metamaterials Self-trapped localized beams

17 Microwave metamaterials from Canberra

18 Epsilon-near-zero channel Tunability of the ENZ channel

19 Arrays of nonlinear SRRs i n 2 (2 i n ) n ( n 1 n 1 2 n) t N. N. Rosanov, Spatial Hysteresis and Optical Patterns (Springer, 2002). Bistability, modulational instability, switching waves, dissipative solitons,

20 Moving switching waves

21 Hysteresis of switching wave velocity V > 0 means widening of the region corresponding to the upper branch Mechanical analogy: static friction > rolling friction Bistability range: Not standard bistability!

22 Outline of today s talk Back to 1988 Disorder and nonlinearity Bistability of Anderson states Photonic crystals & Fano resonances Nonlinear metamaterials Self-trapped localized beams

23 Spatial optical solitons

24 Self-trapping in BEC Th. Anker et al, PRL 94, (2005)

25 Novel broad gap states truncated nonlinear Bloch modes two types of modes

26 Nonadiabatic generation Nonadiabatic loading into a 1D optical lattice produces broad states t=0 t=25 ms V 0 4E R ; N ~10 3 V 0 T.J. Alexander et al, Phys. Rev. Lett. 96, (2006)

27 Experimental observation in optics

28 Summary Nonlinearity produces many interesting effects in wave propagation and scattering Many effects have been observed and verified experimentally We hope Costas will find more time to study nonlinear effects!!

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