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

10:30 Invited talk : Chiral Nanostructures with Plasmon and Exciton Resonances

Alexander Govorov

Ohio University (USA)

Bio-assembled and lithographic nanostructures incorporating metal and semiconductor nanocrystals exhibit strong optical absorption associated with exciton and plasmon resonances. When a system includes chiral molecules, the Coulomb and electromagnetic interactions between excitons and plasmons are able to alter and enhance circular dichroism (CD) of chiral molecular dipoles. Strong CD signals can also appear in purely plasmonic systems with a chiral geometry and a strong particle-particle interaction.
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10:50 Invited talk : Topologically nontrivial photonics of bianisotropic metamaterials

Alexander Khanikaev

Queens College of the City University of New York (USA)

Topologically nontrivial photonic states have been first shown to exist in photonic systems with broken time-reversal symmetry, such as magnetic photonic crystals. Here we demonstrate that topological order for light can also be found in crystals made of Tellegen medium, a special class of bianisotropic response violating time-reversal symmetry. Theoretical simulations of Tellegen crystals reveal existence of topologically robust edge transport insensitive to structural imperfections and defects.
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11:10 Invited talk : Metasurfaces with continuously engineered phase of nonlinearity

Guixin Li (1),Shumei Chen (1),Nitipat Pholchai (2),Polis W. H. Wong (3),Edwin Y. B. Pun (3),KokWai Cheah (4),Thomas Zentgraf (2),Shuang Zhang (1)

(1)University of Birmingham (United Kingdom) , (2)University of Paderborn (Germany) , (3)City University of Hong Kong (Hong Kong) , (4)Hong Kong Baptist University (Hong Kong)

Based on the concept of spin rotation coupling, we propose and realize a novel nonlinear metasurface with homogeneous linear optical properties but continuously controllable phase of the local effective nonlinear polarizability. The continuous phase engineering of the effective nonlinear polarizability enables complete control of the propagation of harmonic generation signals, and therefore, it seamlessly combines the generation and manipulation of the harmonic waves for highly compact nonlinear nanophotonic devices.
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11:30 Invited talk : Nonlinear Metasurface with Magnetic Response

D. N. Neshev

The Australian National University (Australia)

The nonlinear properties of optical metasurfaces can be dramatically enhanced in the vicinity of their magnetic resonances. Here we present our recent studies on enhancement of the nonlinear frequency conversion of plasmonic and all-dielectric metasurfaces with magnetic resonant properties. We characterize the nonlinearity enhancement and the origin of the nonlinear frequency conversion.
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11:50 Invited talk : Nonlinearities in 2D and 2D-3D Heteromaterials

Richard Osgood, Xiang Meng, Hsu-Cheng Huang, Jerry Dadap, Nick Bierket, Sung-Young Hong

Columbia University (USA)

This invited talk discusses the use of optical nonlinearities in a variety of 2D materials, including harmonic frequency generation, nano optical sources, and guided-wave devices.
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12:10 Invited talk : Three-Dimensional Nanohelices for Chiral Photonics

Vittorianna Tasco (1),Marco Esposito (1),Francesco Todisco (1),Alessio Benedetti (2),Massimo Cuscuna (1),Daniele Sanvitto (1),Adriana Passaseo (1)

(1)National Nanotechnology Laboratory (Italy) , (2)Universita di Roma La Sapienza (Italy)

We discuss the tailoring of linear chiroptical effects in three-dimensional plasmonic nanohelices by means of challenging technological nanoscaling approaches, allowing the operation of this metamaterial in the optical frequency range. The growth dynamics involved in focused ion and electron beam induced deposition have been extensively studied and targeted to the realization of complex 3D structures where intrinsic chirality and spatial anisotropy can be controlled at the nanoscale level, towards miniaturized chiral photonics for application in optoelectronics and biological detection.
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