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Home > Tenured Faculties > Miyaji Godai

Tenured Faculties

Miyaji Godai

Affiliation Institute of Engineering
Division Division of Advanced Applied Physics
Research field Nonlinear optics, quantum optics, laser engineering
Keyword(S) Femtosecond laser matterial processing, nanostructure fabrication, surface plasmon polariton
Url https://miyalab.themedia.jp/
Research experience

・Apr.2004-Feb.2014: Assistant professor, Institute of Advanced Energy, Kyoto University
・Feb.2014-Feb.2019: Associate professor, Tokyo University of Agriculture and Technology
・Feb.2019-Present: Associate Professor(Tenured), Tokyo University of Agriculture and Technology

Educational background

・1999: BE, School of Engineering Science, Osaka University
・2001: ME, Graduate school of Engineering Science, Osaka University
・2004: Ph. D. in Engineering, Graduate school of Engineering Science, Osaka University

Awards

・Mar.2013: IAE, Kyoto Univ. Research Award 2012
・May 2014: Laser Society of Japan Best Paper Award 2014
・April 2018: The 65th JSAP (Japanese Society of Applied Physics) Spring Meeting, 2018 Poster Award

Selected papers and publications

・S. Nikaido, T. Natori, R. Saito, and G. Miyaji, "Nanostructure Formation on Diamond-Like Carbon Films Induced with Few-Cycle Laser Pulses at Low Fluence from a Ti:Sapphire Laser Oscillator", Nanomaterials 8, 535 (2018).
・G. Miyaji, M. Hagiya, and K. Miyazaki, "Excitation of surface plasmon polaritons on Si with an intense femtosecond laser pulse", Phys. Rev. B 96, 045122 (2017).
・G. Miyaji, “Calculation Methods for Material Nanoprocessing with Femtosecond-Laser-Induced Plasmonic Near-fields”, Journal of Japan Laser Processing Society 25, 75 (2017). (Invited review paper)
・G. Miyaji and K. Miyazaki, "Fabrication of 50-nm period gratings on GaN in air through plasmonic near-field ablation induced by ultraviolet femtosecond laser pulses", Opt. Express 24, 4648 (2016).
・K. Miyazaki, G. Miyaji, and T. Inoue, "Nanograting formation on metals in air with interfering femtosecond laser pulses", Appl. Phys. Lett. 107, 071103 (2015).
・T. Shinonaga, M. Tsukamoto, and G. Miyaji, "Periodic nanostructures on titanium dioxide film produced using femtosecond laser with wavelengths of 388 nm and 775 nm", Opt. Express 22, 14696 (2014).

Research Description

Our research interest is focused on understanding the light-matter interaction process with intense femtosecond laser pulses and the applications to pioneering new fields of photon energy technology. We are challenging to material control in nanometer-scale size. We have reported the first evidence of excitation of surface plasmon polaritons on nonmetallic materials with intense femtosecond (fs) laser pulses, as the intense fs laser pulse produces a high density of free electrons to form a metal-like layer on the surfaces. The experimental results have demonstrated the generation of enhanced near fields for the periodic ablation of the surfaces. The near-fields of SPPs excited with intense fs laser pulses can sculpt homogeneous periodic nanostructures on the materials. Based on the physical model proposed, our goal is development of novel technique for laser material nanoprocessing.

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About TUAT's tenure-track program

The TUAT Tenure Track Program is excellent for quickly building-up of new laboratory, because it gives me the big financial support, and provides me abating instruction and other works in the university. This program also offers me much opportunity for communicating with many tenured teachers to hold much their experience and knowledge. As a result, I was able to build up my laboratory without hesitation. If this program such as the TUAT Tenure Track Program is expanded to all over the country, the education and research systems in the university are expected to be changed.

Future aspirations

Material science with ultrashort laser pulses is very interesting field, because there is much physical mechanism to be clarified and it can be applied to industrial technology. Through my research outcomes, I would like to play a key role of making a common foundation in various kinds of fields for science and technology.