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

14:00 Invited talk : Linear and nonlinear optical effects in hybrid self-assembled layers of nanoparticles

Thierry Verbiest, Ward Brullot

University of Leuven (Belgium)

We show that hybrid nano materials composed of several different types of nano particles show exciting new linear and nonlinear optical effects. Furthermore, we will address the role of chiral inclusions in these layers on the optical properties.
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14:20 Invited talk : Free-standing terahertz metamaterial fabricated via injection molding

Jinqi Wang, Shuchang Liu, Sivaraman Guruswamy, Ajay Nahata

The University of Utah (USA)

We demonstrate a technique of fabricating free-standing all-metal two-dimensional (2D) and three-dimensional (3D) terahertz metamaterials through injection molding of gallium, a metal that melts at temperatures slightly above room temperature. To obtain free-standing metamaterials, two polydimethylsiloxance (PDMS) molds are created using conventional soft lithography and then peeled away after gallium is injected and solidified. We demonstrate three different approaches for creating 3D metamaterials: a multilayer stack, a manually folded structure and a directly injection molded 3D structure.
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14:40 : Wafer-scale fabrication of plasmonic chiral metamaterials with tunable chiro-optical response.

Greshma Nair, Haobijam Singh, Ambarish Ghosh

Indian Institute of Science (India)

Chiral metamaterials have been promising candidates for applications such as broadband polarizers, negative refractive index. One of the ways to achieve large Circular Dichroism (CD) response is by arranging metallic nanoparticles in chiral geometries.We report wafer-scale fabrication of plasmonic chiral nanostructures, which exhibited large chiro-optical response in the visible. Also, we have demonstrated the tunability of the CD response, by changing the distance between the nanoparticles on a helix and by varying the refractive index of the dielectric template.
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14:55 : A Far-Field Interpretation of Optical Chirality in Analogy to Poynting's Theorem

L. V. Poulikakos (1),P. Gutsche (2),K. M. McPeak (1),S. Burger (2),J. Niegemann (1),Ch. Hafner (1),D. J. Norris (1)

(1)ETH Zurich (Switzerland) , (2)Zuse-Institut (Germany)

The optical chirality density is a valuable tool in locally characterizing chiral electromagnetic near-fields. However, how this quantity could translate into the far-field is not well understood. Here, we formulate a far-field interpretation of optical chirality by investigating its conservation law in isotropic media in analogy to Poynting's Theorem. We define the global chirality and find that lossy materials, in particular plasmonic nanostructures, can act as chirality generators. This can enable chiral sensing applications at the single molecule level.
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