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 Adi Salomon, Yehiam Prior, Radoslaw Kolkowski, Marcin Zielenski, Joseph Zyss WIS, ENS-Cachan

200nm Strong coupling and Symmetry Nanocavities In thin silver film

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

ω 2ω2ω Scanning of the SHG response – Individual Cavities 5 micron

Scanning of the SHG response – Individual Cavities 5 micron

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

Size Resonances – Wavelength dependency triangular side length = 210nm, refractive index = 1.5 Counts/10 sec

Coupling between Neighboring Metallic NanoStructures

Coupling between metallic nanoparticles In analogy to atoms hybridization Gersten, J. I.; Nitzan, A. Surf Sci 1985, 158, (1-3), Sheikholeslami, S.; Jun, Y.-w.; Jain, P. K.; Alivisatos, A. P. Nano Letters 2010, 10, (7), 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), E. Prodan, C. Radloff, N. J. Halas,P. Nordlander Science 302, 419 (2003) Energy

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

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

Plasmonic Hybridization 500 nm

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

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

200 nm

SHG spectra with orthogonal input polarizations Counts/sec

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

Polarization sensitivity Fundamental beam polarization: horizontal 5 microns

Can we probe the degree of coupling?

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

rho= -0.5

Summary & Conclusions Size matters Strong coupling is mediated by SPP

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

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

200 nm 1 micron Thank you ! * Fabricated at WIS

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

Babinet’s Principle

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

Mapping of the spots More than 2 orders of magnitude for shaped triangle !

Non Inversion( )/ Inversion symmetry ( )

100nm SHG emission patterns

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

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

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