1 / 37

From individual to coupled metallic nanocavities

From individual to coupled metallic nanocavities. Adi Salomon , Yehiam Prior Weizmann Institute of Science Radoslaw Kolkowski , Marcin Zielenski , Joseph Zyss ENS- Cachan. From individual to coupled metallic nanocavities.

paco
Télécharger la présentation

From individual to coupled metallic nanocavities

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. From individual to coupled metallic nanocavities AdiSalomon, Yehiam Prior Weizmann Institute of Science RadoslawKolkowski, MarcinZielenski, Joseph Zyss ENS-Cachan

  2. From individual to coupled metallic nanocavities Adi Salomon, Yehiam Prior, Radoslaw Kolkowski, Marcin Zielenski, Joseph Zyss WIS, ENS-Cachan

  3. Nanocavities In thin silver film Strong coupling and Symmetry 200nm

  4. SHG measurements • Coherent process • Sensitive to symmetry • Non linear process Iy .

  5. Scanning of the SHG response – Individual Cavities 5 micron ω 2ω

  6. Scanning of the SHG response – Individual Cavities 5 micron

  7. Size Resonances – side length dependency Experimental conditions: 200nm Ag film evaporated on glass ,(n=1.5) Excitation at : 940nm; SHG at 470nm

  8. Size Resonances – side length dependency

  9. Size Resonances – side length dependency

  10. Size Resonances – Wavelength dependency 960 880 840 920 Counts/10 sec triangular side length = 210nm, refractive index = 1.5

  11. Coupling between Neighboring Metallic NanoStructures

  12. Coupling between metallic nanoparticles In analogy to atoms hybridization +- +- +- +- Energy +- +- +- + - +- +- • Gersten, J. I.; Nitzan, A. Surf Sci 1985, 158, (1-3), 165-189. • Sheikholeslami, S.; Jun, Y.-w.; Jain, P. K.; Alivisatos, A. P. Nano Letters 2010, 10, (7), 2655-2660 • Rahmani, M.; Lei, D. Y.; Giannini, V.; Lukiyanchuk, B.; Ranjbar, M.; Liew, T. Y. F.; Hong, M. H.; Maier, S. A. Nano Lett 2012, 12, (4), 2101-2106 • E. Prodan, C. Radloff, N. J. Halas,P. Nordlander Science 302, 419 (2003)

  13. d=10nm d=15nm d=25nm d d=50nm d=250nm L. Gunnarsson et al. J. Phys. Chem. B 2005, 109, 1079-1087

  14. Strong coupling between metallic nanocavities • Can we design nanocavities that • couple to long distances ? • How can we probe the degree of • coupling in these systems ?

  15. Plasmonic Hybridization 500nm

  16. Strong coupling and Symmetry 200nm 3-fold symmetry ? Reduced symmetry- when coupled

  17. SHG response at two orthogonal polarizations Triangle side length = 200nm

  18. SHG response at two orthogonal polarizations 200 nm 200 nm

  19. SHG spectra with orthogonal input polarizations Counts/sec Counts/sec

  20. SHG emission from coupled cavities 200nm 200nm The SHG emission is polarized !

  21. Polarization sensitivity 5 microns Fundamental beam polarization: horizontal

  22. Can we probe the degree of coupling?

  23. Theoretical model (a) (b) For three fold symmetry : We define:

  24. rho= -0.5

  25. Summary & Conclusions • Size matters • Strong coupling is mediated by SPP

  26. Future directions • complementarity (Babinet’s principle) • between nanoparticles and nanocavities. • What about chirality?

  27. SHG from Metallic Nano Cavities • Joseph Zyss • Yehiam Prior Radoslaw Kolkowski Marcin Zeilenski

  28. Thank you ! 200 nm 1 micron 1 micron 200 nm 200 nm 1 micron 1 micron 200 nm * Fabricated at WIS

  29. Plasmonic Hybridization – In analogy to atoms hybridization 500nm * Triangular hole side length ~ 200nm

  30. Babinet’s Principle

  31. Case study: Array of individual triangles , side length 300nm 1 1 3 2 3 2

  32. Mapping of the spots More than 2 orders of magnitude for shaped triangle ! 1 1 2 3

  33. Non Inversion( )/ Inversion symmetry ( )

  34. SHG emission patterns 100nm 100nm

  35. Polarization properties of an individual cavity Figure 3 200nm (a) 200nm (b)

  36. Strong coupling between nanostructures • Can we consider nanocavitiesto be simply the complementary • structures to nanoparticles? • Can we design nanostructures that lead to coherent coupling? • How can we probe the amount of coupling in these systems ?

  37. Theoretical model (a) (b) (c) ρ=-1 ρ=-0.5 ρ=-0.1

More Related