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Large-scale metamaterial assemblies II

10:20 : Metamaterial SERS Substrates Based on Au Nanoparticle and Block Copolymer Self-Assembly

Xin Zhang, Robert M. Briber, Oded Rabin

University of Maryland College Park (USA)

Metamaterials consisting of gold nanoparticle arrays on silicon and gold substrates were fabricated by self-assembly and were used as surface enhanced Raman scattering substrates. These large area and low cost substrates have uniform enhancement factors. All the metamaterial components contribute to the signal enhancement, as demonstrated by modifying the nanoparticle size, substrate materials, and degree of ordering of the array. Metamaterial optimization resulted in enhancement factors using 4-aminothiophenol as a probe and 785 nm laser excitation.
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10:35 Invited talk : Chiral Plasmonic Nanolens Arrays via Directed Assembly of Gold Nanoparticles

Sushmita Biswas (1),Xiaoying Liu (2),Jeremy Jarrett (3),Vitaliy Pustovit (1),Augustine Urbas (1),Kenneth L. Knappenberger Jr. (3),Paul Nealey (2),Richard Vaia (1)

(1)Air Force Research Laboratory (USA) , (2)The Institute for Molecular Engineering-University of Chicago (USA) , (3)Florida State University (USA)

Efficient focusing of linear and higher order optical fields holds immense potential in nanophotonics, such as enabling novel on-chip optical functionality. Metal nanoparticle assemblies are promising due to their intense inter-particle electromagnetic interactions, however large-area fabrication of ordered arrays with request local architectural precision and surface quality is extremely challenging. In this work, we demonstrate the feasibility of surface-directed assembly of gold nanoparticles to produce deterministic arrays with high-yield and controlled orientation of complex homo and hetero-architectures.
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10:55 Invited talk : Nanocrystal superlattices as tunable metamaterial assemblies

Matteo Cargnello

Stanford University (USA)

Nanocrystal superlattices as tunable metamaterial assemblies are the focus of this contribution. Self-assembly strategies can be utilized to obtain films with long range ordering and properties that are dictated by the appropriate choice of building blocks and their spatial organization. As key examples, quasi-quaternary and doped nanocrystal superlattices are reported, where optical and electrical properties of ordered layers are tuned by varying the 3D arrangement of the constituent building blocks.
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11:15 Invited talk : High-throughput Optical Metamaterials

Jake Fontana, S. A. Trammell, C. M. Soto, J. Naciri, B. R. Ratna

Naval Research Lab (USA)

By controlling the spatial and orientational order of plasmonic nanoparticles unique electromagnetic, electronic and chemical properties have been demonstrated. Developing assembly strategies to bridge these properties into materials for disruptive technologies is critical. Here I highlight our recent approaches to develop high-throughput macroscopic metamaterials.
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11:35 Invited talk : Large-area metamaterials and gram-scale metafluids: design, fabrication, and nano-optical tomographic characterization

Jennifer A. Dionne

Stanford University (USA)

We introduce the design, fabrication, and three-dimensional nano-optical characterization of large-area metamaterials and gram-scale metafluids. First, we use transformation optics to design a broadband metamaterial constituent. Then, we describe a novel tomographic technique to visualize radiative optical transitions in this metamaterial constituent with nanometer-scale resolution. Finally, we demonstrate the fabrication of large-area metamaterials and gram-scale metafluids, and show how these materials can be used to enhance the efficiency of solar upconversion.
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