Researcher Information


Associate Professor

Single particle/molecule analysis by Plasmonics

Department of Chemistry, Inorganic and Analytical Chemistry


Understanding and applications of nanophotonics for analytical chemistry

FieldAnalytical chemistry, Surface/interfacial Physics, Optical physics, Machine learning
KeywordPlasmonics, Nanobiodevices, Organic devices, 2D materials, Single particle/molecule analysis, First principle calculation

Introduction of Research

To understand nanophotonics generated around nanostrcutres and to apply nanophotonics to novel analytical technologies and biosensors. Specifically, we work on the plasmonic enhancement field obtained by the resonance of light with free electrons in nanostructures. Understandings the plasmonic properties of various materials such as metals and graphene from the viewpoint of electronic and optical properties enable us to control them, and finally to analyze single molecules and/or single nanoparticles by using the plasmonic enhancement field. For example, we are recently interested in plasmonic nanopore devices for DNA, RNA, and bio-nanoparticles.

Schematic illustration of Nanopore device
Graphene nanopore
Multiphysics simulation
Schematic illustration of plasmonic metal nanoparticles
Chemically Induced Permittivity-change effect
Original high-speed CCD detector

Representative Achievements

Effect of chemically induced permittivity changes on the plasmonic properties of metal nanoparticles,
N. Saito, S. Ryuzaki*, Y. Tsuji, Y. Noguchi, P. Wang, D. Tanaka, Y. Arima, K. Okamoto, K. Yoshizawa, and K. Tamada,
Commun. Mater. 2, 54 (2021).
Rapid discrimination of extracellular vesicles by shape distribution analysis,
S. Ryuzaki*, T. Yasui, M. Tsutsui, K. Yokota, Y. Komoto, P. Paisrisarn, N. Kaji, D. Ito, K. Tamada, T. Ochiya, M. Taniguchi, Y. Baba, and T. Kawai,
Anal. Chem. 93, 7037 (2021). (Cover Art).
Field effect control of translocation dynamic in surround-gate nanopores,
M. Tsutsui, S. Ryuzaki, K. Yokota, H. Yuhui, T. Washio, K. Tamada, and T. Kawai,
Commun. Mater. 2, 29 (2021). (Co-first author, Cover Art).
Rapid structural analysis of nanomaterials in aqueous solutions,
S. Ryuzaki, M. Tsutsui, Y. He, K. Yokota, A. Arima, T. Morikawa, M. Taniguchi, and T. Kawai,
Nanotechnology 28, 155501 (2017).
An influence of charge accumulation of photo-generated carriers in the vicinity of donor/acceptor interface on the open-circuit voltage of Zinc- porphyrin/C60 hetero-junction organic photovoltaic cells,
S. Ryuzaki and J. Onoe,
J. Phys. D: Appl. Phys., 44, 265102 (2011).

Related industries

Chemistry, Physics, Material physics, Medical device, Energy
Academic degreePh.D.
Academic background2005 B.A., Department of Physics, Tokyo University of Science
2010 M.S., Department of Nuclear Engineering, Tokyo Institute of Technology
2010 Ph.D., Department of Nuclear Engineering, Tokyo Institute of Technology
2010 Postdoc., Nano-Science Center, University of Copenhagen
2012 Assistant Professor, The Institute of Scientific and Industrial Research, Osaka University
2014 Assistant Professor, Institute for Materials Chemistry and Engineering, Kyushu University
2022 Associate Professor, Department of Chemistry Hokkaido University
Affiliated academic societyThe Japan Society of Applied Physics, The Japan Society for Analytical Chemistry, The Society of Nano Science and Tchnology, Japan MRS, American Chemical Society
Room addressScience Building 6, 7-02.