Optical properties of mesogen-coated gold nanoparticles

José Dintinger; Bai-Jia Tang; Xianbing Zeng; Tobias Kienzler; Georg H. Mehl; Goran Ungar; Carsten Rockstuhl; Toralf Scharf

doi:10.1117/12.906999

16 February 2012 Optical properties of mesogen-coated gold nanoparticles

José Dintinger, Bai-Jia Tang, Xianbing Zeng, Tobias Kienzler, Georg H. Mehl, Goran Ungar, Carsten Rockstuhl, Toralf Scharf

Author Affiliations +

Proceedings Volume 8271, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling IX; 827106 (2012) https://doi.org/10.1117/12.906999
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

In this work, the physical and optical properties of gold nanoparticles functionalized with laterally grafted nematic ligands were studied. In particular, the influence of the nanoparticle size on the mesomorphic behavior and optical properties of the composite was investigated. To obtain an in-plane alignment of the mesogens, thin oriented films were prepared by shearing and characterized by polarized absorption spectroscopy. While the sub-2nm nanoparticle thin film only showed birefringence due to a strong damping of the plasmon resonance, larger NPs exhibit a strong dichroism with a shift of the NP plasmon resonance by about 50 nm. These results demonstrate the possibility to obtain a bulk NP metamaterial with tunable plasmonic properties by chemical engineering of the NP ligands.

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José Dintinger, Bai-Jia Tang, Xianbing Zeng, Tobias Kienzler, Georg H. Mehl, Goran Ungar, Carsten Rockstuhl, and Toralf Scharf "Optical properties of mesogen-coated gold nanoparticles", Proc. SPIE 8271, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling IX, 827106 (16 February 2012); https://doi.org/10.1117/12.906999

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