Seminar announcement

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Written by Hoang Quoc Khanh

Wednesday, 28 December 2011 01:33

Seminar announcement

Title: Electromagnetic standing waves in nano-objects
By Dr. NAGAO, Tadaaki
(National Institute for Materials Science (NIMS), JAPAN)
Place: 09:30, February 7th, 2012, International Training Institute for Materials Science (ITIMS),
Hanoi University of Science and Technology (HUST)

Abstract: In the past decade, surface-localized electromagnetic waves as well as those of the low-dimensional variants have become increasingly important in nanotechnology since their optical properties are strongly dependent on the size and the shape of the small objects. Such feature can be utilized for tailoring optical properties for future nano-photonics/optics devices as well as high-sensitivity sensors and efficient catalytic materials.

In this contribution, we plan to introduce our recent results on the optical absorption spectroscopy by the excitations of standing-wave plasmons (1) in an array of Metallic atomic chains, atomically thin discs (2) Lithographically prepared nanoantennas (3) Wet-chemically prepared islands on silicon substrates. By tuning the preparation conditions, we tuned the size of these objects and the resonance frequency of the optical absorption was also systematically shifted as a function of their geometrical parameters. In some systems the observed behavior was found to be explained by the plasmonic resonators expected from surface plasmon polariton (SPP) scenario while in others the behavior was found to be different from the conventional SPP scenario. We also present our recent studies on the light-material interactions in efficient energy conversion and medical diagnostics.

Fig. 1: Schematic illustration of the confined standing-waves in various metallic plasmonic structures.

Dr. NAGAO, Tadaaki
Group Leader, Nano-System Photonics Group, MANA/Nano-System Field/Nano-System Organization Unit,
National Institute for Materials Science (NIMS), JAPAN
Email: NAGAO.Tadaaki nims.go.jp
Phone: +81-29-860-4746
1-1 Namiki, Tsukuba, Ibaraki, 305-0044 JAPAN

Selected publications
T. Nagao, G. Han, C. Hoang, J. Wi, A. Pucci, D. Weber, F. Neubrech, V. Silkin, D. Enders, O. Saito, M. Rana : “Plasmons in nanoscale and atomic-scale systems” Sci. Tech. Adv. Mat. 11 (2011) 054506 -1-054506 -12
•F. Neubrech, D. Weber, D. Enders, T. Nagao, A. Puci : “Antenna sensing of surface polaritons” J. Phys. Chem. C 114 (2010) 7229-7301
K. Nomura, T. Nagao, B. L. Cho, H. Katsuda, T. Matsumura and C. Oshima : “Thermodynamically stable nanotips of Au–Mo alloy” J. Vac. Sci. Technol. B 27[6] (2009) 2432-2434
S. Yaginuma, K. Nagaoka, T. Nagao, G. Bihlmayer, Y. M. Koroteev, E. V. Chulkov and T. Nakayama : “Electronic Structure of Ultrathin Bismuth Films with A7 and Black-Phosphorus-like Structures” J. Phys. Soc. Jpn. 77[1] (2008) 014701
C. Liu, T. Inaoka, S. Yaginuma, T. Nakayama, M. Aono and T. Nagao : “The excitation of one-dimensional plasmons in Si and Au–Si complex atom wires” Nanotechnology 19[35] (2008) 355204