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Bottom‐Up Tailoring of Plasmonic Nanopeapods Making Use of the Periodical Topography of Carbon Nanocoil Templates |
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| Authors: | Yong Qin Ralf Vogelgesang Moritz Eßlinger Wilfried Sigle Peter van Aken Oussama Moutanabbir Mato Knez |
| Affiliation: | 1. Institute of Coal Chemistry, Chinese Academy of Sciences, 030001, Taiyuan, P. R. China;2. Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany;3. Max Planck Institute for Intelligent Systems, 70569 Stuttgart, Germany;4. Department of Engineering Physics, Ecole Polytechnique de Montreal, Montreal, C.P. 6079, Succ. Centre‐Ville, Montreal, Quebec, H3C 3A7 Canada;5. CIC nanoGUNE Consolider, Tolosa Hiribidea 76, 20018 Donostia‐San Sebastian, Spain Ikerbasque, Basque Foundation for Science, Alameda Urquijo 36‐5, 48011 Bilbao, Spain |
| Abstract: | Au nanoparticle chains embedded in helical Al2O3 nanotubes (“nanopeapods”) are synthesized by annealing carbon nanocoils coated with Au by sputtering and Al2O3 by atomic layer deposition. Regular spacing between nanoparticles with a sharp size distribution is achieved by fragmentation of the Au coating in agreement with the pitch of the nanocoils arising from three‐dimensional periodical topography of the carbon nanocoil templates. A strong plasmonic resonance behavior of the fabricated nanopeapods manifests itself in confocal laser scanning microscopy by a clear polarization contrast at red wavelengths, which is absent in the blue. Numerical simulations confirm an incisive resonance enhancement for longitudinal polarization and suggest the nanopeapods as promising candidates for highly efficient, ultrathin waveguides. The waveguiding properties of the nanopeapods are investigated by electron energy‐loss spectroscopy and energy‐filtered TEM imaging. |
| Keywords: | atomic layer deposition carbon nanocoils nanopeapods plasmon resonance waveguides |