Title: Electromagnetic standing waves in nano-objects
By Dr. NAGAO, Tadaaki
(National Institute for Materials Science (NIMS), JAPAN)
09:30, February 7th, 2012, International Training Institute for
Materials Science (ITIMS),
Hanoi University of Science and Technology
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.
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
1-1 Namiki, Tsukuba, Ibaraki, 305-0044 JAPAN
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
•F. Neubrech, D. Weber, D. Enders, T. Nagao, A. Puci : “Antenna
sensing of surface polaritons” J. Phys. Chem. C 114 (2010) 7229-7301
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 (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 (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 (2008) 355204