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Development of Bottom-Up Chemical Approaches to 3-D Negative Index Meta-Materials: Two Photon Lithographic Approach-Chiral Chemical Synthesis Approach

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Technical Report,01 Apr 2009,31 Mar 2014

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Research Foundation of The State University of New York at Buffalo Buffalo United States

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The objective of this project was to develop a new approach to 3-D metamaterials. A key step was developing materials with large optical activity. A series of chiral polymers, based on thiophene, fluorene, and fluorene-quinoxaline motif with chiral side chains were synthesized, post-processed and characterized in both solution and film phases. A new concept of chirality enhancement via coupling with plasmonic, excitonic and magnetic nanoparticles was introduced for the first time and verified experimentally. Theoretical models were proposed to explain the enhancement. The enhancement of nonlinear optical activity by utilizing pi-conjugated molecular building blocks was proposed and experimentally realized. Writing of sub-wavelength metal-nanoparticle-containing metamolecules was demonstrated via simultaneous photoreduction of a gold precursor and crosslinking of a photoresist using two-photon excitation, opening the way to a faster and more cost efficient top down manufacturing of metamaterials. Photopatternable polymer nanocomposites of chiral polymer and SU-8 photoresists were produced and photopatterning was demonstrated. Joint papers with researchers at AFRL in Dayton have been published, thus aiding in transitioning of our concepts to AFRL.

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