Presenter: Prof. Andrea Toma (Italian Institute of Technology, Italy)
Topic: The nano-plasmonics charm: from superhydrophobic and 3D nanodevices to magnetic field manipulation
Time: 10:00 a.m., Aug. 4th (Thursday)
Location: Conference Room 308, BLDG 910-3F
Abstract
The fabrication of complex 3D plasmonic nanostructures integrated in innovative device architectures represents a multidisciplinary key activity at the core of most research efforts in nanoscience and technology. Here we would like to describe how superhydrophobicity can be successfully combined with unconventional plasmonic structures for overcoming the diffusion limit, hence allowing the realization of devices capable of detecting, in a very short time, an extremely small number of molecules [1, 2]. We will proceed by introducing a novel manufacturing process capable of defining three-dimensional nanostructures/nanocavities made of noble metals of various shapes and spatial arrangements. Within this context, the fabrication of 3D nanostructures has been exploited for identifying innovative device configurations for optofluidic/optoelectronic and biosensing applications (i.e. vertical 3D hollow nanostructures and/or 3D nanostars as recyclable SERS platform) [3, 4]. Moreover the integration of 3D nanostructures with scanning probe tips has promoted the conception of a new kind of nanoscopy based on the combination of adiabatic compression and hot electrons [5].
Finally, intense efforts have been spent in extending the hybridization concepts [6, 7] from electricto magnetic-like modes. Due to the low magnetic susceptibility of plasmonic metals, the generation of intense magnetic hot-spots in the visible spectral range represents a challenging point for the plasmonics community. In this regard, we developed and experimentally demonstrated a plasmonic nanoarchitecture (i.e. arrays of asymmetric trimers) able to sustain a magnetic coil-type plasmonic mode induced in Fano-like condition [8,9].
Fig1. Representative SEM micrographs of 3D plasmonic nanodevices and planar Fano coil-type resonators.
1. F. De Angelis, F. Gentile, F. Mecarini, G. Das, M. Moretti, P. Candeloro, M. L. Coluccio, G. Cojoc, A. Accardo, C. Liberale, R. Proietti Zaccaria, G. Perozziello, L. Tirinato, A. Toma, G. Cuda, R. Cingolani, E. Di Fabrizio, Nat. Photonics 5, 682 (2011).
2. E. Miele, M. Malerba, M. Dipalo, E. Rondanina, A. Toma, F. De Angelis, Adv. Mater. 26, 4179 (2014).
3. F. De Angelis, M. Malerba, M. Patrini, E. Miele, G. Das, A. Toma, R. Proietti Zaccaria, E. Di Fabrizio, Nano Lett. 13, 3553 (2013).
4. M. Chirumamilla, A. Toma, A. Gopalakrishnan, G. Das, R. Proietti Zaccaria, R. Krahne, E. Rondanina, M. Leoncini, C. Liberale, F. De Angelis, E. Di Fabrizio, Adv. Mater. 26, 2353 (2014).
5. A. Giugni, B. Torre, A. Toma, M. Francardi, M. Malerba, A. Alabastri, R. Proietti Zaccaria, M. I. Stockman, E. Di Fabrizio, Nat. Nanotechnol. 8, 845 (2013).
6. S. Panaro, A. Nazir, C. Liberale, G. Das, H. Wang, F. De Angelis, R. Proietti Zaccaria, E. Di Fabrizio, A. Toma, ACS Photonics 1, 310 (2014).
7. P. Zilio, M. Malerba, A. Toma, R. Proietti Zaccaria, A. Jacassi, F. De Angelis, Nano Lett. 15, 5200 (2015).
8. A. Nazir, S. Panaro, R. Proietti Zaccaria, C. Liberale, F. De Angelis, A. Toma, Nano Lett. 14, 3166 (2014).
9. S. Panaro, A. Nazir, R. Proietti Zaccaria, L. Razzari, C. Liberale, F. De Angelis, A. Toma, Nano Lett. 15, 5200 (2015).
Biography
Andrea Toma has a long-standing experience in the fabrication and characterization of 3D nanostructures, facing cutting-edge issues in plasmonics and nanophotonics. He is research scientist at the Italian Institute of Technology where he currently leads the magneto-plasmonics group (2 Post-docs, 3 PhD students and 1 master student). Andrea Toma is Adjunct Professor at the University of Genova and, since 2012, member of the Proposal Study Panel at the Lawrence Berkeley National Laboratory. He published 80 scientific papers on ISI-indexed peer-reviewed journals and holds 5 patents (citations>500/year, h-index=25). In particular he contributed to 1 Nature Nanotechnology (IF 35.267), 1 Nature Photonics (IF 31.167), 3 Advanced Materials (IF 17.493), 6 Nano Letters (IF 13.779), 5 ACS Nano (IF 13.334), 1 Advanced Functional Materials (IF 11.805), 2 Physical Review Letters (IF 7.512). Andrea Toma works as referee for many international journals and international funding agencies; he is fellow of the Italian Society of Optics and Photonics and a program committee member of few conferences on light-matter interaction and nano-/micro-fabrication. In 2014 he was appointed Editor on Nano-Plasmonics for the Encyclopedia of Nanotechnology, Springer and awarded as Experienced external reviewer of the Swiss National Science Foundation (SNSF) / Switzerland.
Contact: Prof. Lin Jiang
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