Tadaaki Nagao

Tadaaki Nagao
Affiliation:
Nano-System Organization Unit, Nano-System Photonics Group
Specialty:
Surface and Interface Nanoscale Physics, Plasmonics, Nanoscale Materials Optics
Academic degree:
Ph. D, Waseda University (1995)
Recent publications
See NIMS Researchers DB

Educational and Working History

2011 - Present MANA Scientst, Nano-System Photonics Group, Group Leader, MANA, National Institute for Materials Science (NIMS)
2007 - 2011 MANA Independent Scientst, MANA, NIMS
2006 - 2007 Senior Researcher, Nanosystem Functionality Center, NIMS
2005 - 2006 Senior Researcher, Subgroup leader, Nanomaterials Laboratory ,NIMS
2004 - 2005 Senior Researcher, ICYS, NIMS
2001 - 2004 Associate Professor, Institute for Materials Research, Tohoku University
2000 - 2003 Researcher, Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency
1994 - 2001 Research Associate, Department of Physics, University of Tokyo
1994 Research Associate, Waseda University

Research Interests

Phonons at surfaces and in thin films:

He studied the surface phonons of LaB6 (high brightness electron emitter), and clarified the mechanism of lattice relaxation of boron network for the first time for borides. He also studied phonons in epitaxial monolayers of alkali metal (low-work function material), which is one of the first studies that provided quantitative comparison between the ab initio theory and the experiment.

Atomic-scale low-dimensoinal plasmonics:

Confinement and propagation of plasmons in nanoscale objects becomes important for prospective application in modern electronics and photonics devices. Plasmons confined in atomic-scale low-D objects were detected by use of nano-spectroscopic technique with highly- collimated slow electron beam. Atomic-scale confinement effect in plasmon dispersion, dynamic exchange correlation, and in plasmon lifetime was clarified. He also runs fundamental and application study of plasmon-enhanced spectroscopy in infrared spectral region, by controlling the structure of nanometer-scale low-D metallic objects.

Spin-orbit splitting in nanomaterials:

He also studies Rashba-type spin-orbit coupling (SOC) effect in atomic-scale objects in various metallic nanostructures fabricated on silicon template surfaces. Correlation between the quantum-size effects, plasmonic properties, etc. is now under investigation.

Selected Papers

  1. "Plasmons in nanoscale and atomic-scale systems"
    T. Nagao, G. Han, C. V. Hoang, J.-S. Wi, A. Pucci, D. Weber, F. Neubrech, V. M. Silkin, D.Enders, O. Saito and M. Rana
    Science and Technology of Advanced Materials, 11 (2010), 054506 (invited review)..
  2. "Optical detection of plasmonic and electronic excitations in 1 nm-wide indium atomic wires"
    H. V. Chung, C. J. Kubber, G. Han, S. Rigamonti, D. Sanchez-Portal, D. Enders, A. Pucci and T. Nagao
    Applied Physics Letters 96, 243101 (2010).
  3. "Chapter 9: Low-dimensional plasmons in atom sheets and atom chains" in Dynamics at Solid State Surfaces and Interfaces, Volume I, (Edts.) U. Bovensiepen, H. Petek and M. Wolf (Wiley VCH), pp189-211(2010). ISBN: 978-3-527-40937-2.
  4. "One-dimensional plasmon in atomic-scale metal wire"
    T. Nagao, S. Yaginuma, T. Inaoka and T. Sakurai
    Physical Review Letters, 97, (2006) 116802.
  5. "Role of Spin-orbit coupling and hybridization effects in the electronic structure of ultrathin Bi films"
    T. Hirahara, T. Nagao, I. Matsuda, G. Bihlmayer, E. Chulkov, Y. Koroteev, P. M. Echenique, M. Saito and S. Hasegawa
    Physical Review Letters, 97, (2006) 146803.
  6. "Effects of the change in dimensionality on plasmons in metallic nanomaterials"
    T. Nagao
    OYO BUTURI, 73, 1312-1318(2004) (front cover article).
  7. "Nanofilm Allotrope and Structural Transformation of Bi film on Si(111)-7x7"
    T. Nagao, J. T. Sadowski, M. Saito, S. Yaginuma, T. Kogure, T. Ohno, Y. Fujikawa, S. Hasegawa and T. Sakurai
    Physical Review Letters, 93, (2004) 105501.
  8. "Dispersion and damping of a two-dimensional plasmon in a metallic surface-state band"
    T. Nagao, T. Hildebrandt, M. Henzler, and S. Hasegawa
    Physical Review Letters, 86, (2001) 5747-5750.