Chiral and Nonlinear Metamaterials: Properties, Fabrication, and Applications II

14:00 Invited talk : Electronic energy transfer in chiral media and metamaterials

David Andrews, Kayn Forbes

University of East Anglia (United Kingdom)

The photonic mechanism for local electronic excitation transfer in condensed media is generally understood in terms of coupling electric dipole transitions. By considering additional magnetic effects, chiral aspects emerge, relating to the distinctive character of electromagnetic propagation in a non-symmetric environment. These relate to chiral physics that is also involved in optical electrostriction and circular dichroism. Entirely different photonic behaviour is anticipated when electronic energy transfer occurs in a negative-index medium, even when associated with purely electric dipole coupling.
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14:20 Invited talk : Second-harmonic generation from metasurfaces - more than resonance enhancement

Robert Czaplicki (1),Jouni Makitalo (1),Roope Siikanen (1),Hannu Husu (1),Joonas Lehtolahti (2),Markku Kuittinen (2),Martti Kauranen (1)

(1)Tampere University of Technology (Finland) , (2)University of Eastern Finland (Finland)

We probe metasurfaces of L- and T-shaped gold nanoparticles by second-harmonic generation. The nonlinear radiation from such samples can be boosted through several mechanisms. Furthermore, for certain geometries, the detuning of the incident field polarization from the resonant direction can enhance the overall second-harmonic response.
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14:40 Invited talk : Plasmonic meta-molecules in the quantum tunneling regime

A. Garcia-Etxarri (1),J. Scholl (2),G. Aguirregabiria (1),R. Esteban (1),H. Alaeian (2),T. Narayan (2),J. A. Dionne (2),J. Aizpurua (1)

(1)Donostia International Physics Center- CSIC-UPV/EHU (Spain) , (2)Stanford University (USA)

Closely spaced plasmonic nanoparticles exhibit highly tunable hybridized resonances based on nanoparticle geometry, spacing, and arrangement. Such resonances have allowed for applications ranging from nanoantennas to chiral metamaterials. Here, we explore the quantum-influenced modes of a plasmonic trimer using scanning transmission electron microscopy and electron energy-loss spectroscopy. Our combined experimental and theoretical work provides the first complete evolution of magnetic and dark modes in the classical and quantum tunneling regime, and may enable new quantum plasmonic meta-molecules and metamaterials.
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