ナノ光科学 - English

Nano Optical Science Laboratory, Toyota Technological Institute

2023-01-13 updated

Researches about optical force

Dr. Tetsuhiro Kudo, a principal investigator, has joined the Laser Science Laboratory in Toyota Technological Institute (TTI) as a Lecturer, the position between assistant and associate professor in Japan, since Oct. 2020. Now, we are working on new challenges of optical manipulation using Mid-infrared laser techniques. We have elaborated methods to handle the Mid-IR laser and its optics. We recently found unique and exciting results (Dec. 2021). TTI celebrated its 40th anniversary in 2021, and our group is the leading young group. We are looking for Ph.D. students and Postdoc Researchers from foreign countries for this growing up group. Besides, I have experienced living outside Japan totally for 11 years, so a conversation in English will be no problem.

Career

Tetsuhiro Kudo, Ph.D.
Specialty: Laser physics, Laser microscope, Optical manipulation, Optical trapping, Mid-infrared laser, and Mid-infrared plasmonics

1991 to 1995 Tennessee, United States.

2007 Electronic Engineering, National Institute of Technology, Nara College, Nara, Japan. I started to be interested in light and laser during a lecture teaching us about the Bohr model. At that time, I felt strange but also very interested in light irradiation from an atom when the excited electron decays to a lower energy state.

2014 Ph.D. in Department of Physics and Electronics, Osaka Prefecture University, Osaka, Japan. From here, I started theoretical research on optical trapping and optical tweezers. We investigate the optical trapping using a resonant laser which can excite the electronic transition of matters.

2014/4 to 2020/8 (a) JSPS Research Fellow for abroad, (b) MOST Postdoc, and (c) Assistant Research Fellow, in Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan. I started experimental research on optical trapping. I shifted from theoretical study to experiment.

2020/10~ current, Lecturer (principle investigator) in Toyota Technological Institute, Nagoya, Japan. Now we are exploring the optical manipulation utilizing Mid-infrared light sources. Use advanced mid-infrared light sources for controlling nanoscopic matters.

taken at the laboratory in Toyota Technological Institute (2022/7/26)

Optical Manipulation Gallery (Conventional Techniques)

↑Particles diffusing in solvent are transported from left to right. Laser is introduced from left to right and focused around the center of this video.

↑The demonstration of a standard type of optical tweezers.

↑ A counter-propagated laser beam traps particles. Several particles are making alignment.

[Our Original] Optical manipulation with new infrared laser techniques.

Optothermal trapping with mid-infrared lasers

Polystyrene particles diffusing in water are trapped by thermal gradient generated by exciting the water vibrational modes with 2μm laser.

Optical sorting of particles

(top video) By exciting the vibrational modes of Si-O-Si bonds in silica particles, they are selectively pushed in the mid-infrared evanescent wave.

(bottom video) Polystyrene particles are not vibrationally excited by this laser, so they are not pushed. This is the first demonstration of optical manipulation with mid-infrared light sources.

Equipments

Home-made inverted optical microscope with home-made infrared fiber lasers
Home-made 3D motorized inverted optical microscope with a 1064 nm CW laser and 1030 nm ultrafast pulsed Yb doped fiber laser
Home-made upright ATR optical microscope with Mid-IR light sources
Tunable mid-infrared quantum cascade lasers(Daylight solutions)
IR detectors (power meter, beam profiler, spectrometer) and related optics for Mid-IR region
UV-Visible and FTIR(ATR) spectrometers
Optical tables in Clean booths
Tabletop SEM
Fundamental tools for preparing samples (colloidal suspensions, glass substrates, DI water, spacers, pipets, vortex mixer, sonication, electronic balance, magnetic stirrer with heat control, and other fundamental tools)
Computer softs we use for data analysis are typically ImageJ, Micromanager, Python, MATLAB, Fortran90, Ansys Lumerical FDTD

Home-made inverted optical microscope with infrared fiber lasers

Home-made upright ATR optical microscope with Mid-IR light sources

Home-made 3D motorized inverted optical microscope with a 1064 nm CW laser and femtosecond 1030 nm Yb fiber laser.

Publication in TTI

[7] Yoshua Albert Darmawan, Taiki Yanagishima, Takao Fuji, and Tetsuhiro Kudo, "Proposed Method for Label-Free Separation and Infrared Spectroscopy of Carbonyl-Containing Micro- and Nanoparticles Using Mid-Infrared Optical Force," Anal. Chem. 97, 14658–14665 (2025).

[6] Roukuya Mamuti, Masaya Shimizu, Takao Fuji, and Tetsuhiro Kudo, "Opto-thermal manipulation with 3 μm mid-infrared Er:ZBLAN fiber laser," Optics Express 32, 12160-12171(2024), first two authors are contributed equally.

[5] Yoshua Albert Darmawan, Takuma Goto, Taiki Yanagishima, Takao Fuji, and Tetsuhiro Kudo, "Mid-Infrared Optical Force Chromatography of Microspheres Containing Siloxane Bonds," J. Phys. Chem. Lett. 14, 7306−7312 (2023), selected as Front Cover.

[4] Yoshua Albert Darmawan, Takuma Goto, Taiki Yanagishima, Takao Fuji, and Tetsuhiro Kudo, "Midinfrared optical force for sorting materials depending on their chemical structures," in Conference on Lasers and Electro-Optics/Europe (CLEO/Europe 2023) and European Quantum Electronics Conference (EQEC 2023), Technical Digest Series (Optica Publishing Group, 2023), paper eg_6_3.

[3] Roukuya Mamuti, Takao Fuji, and Tetsuhiro Kudo "2μm Tm-doped fiber laser trapping of colloidal particles by temperature gradient," Proc. SPIE 12479, Optical Manipulation and Structured Materials Conference (OMC 2022), 124790N (8 December 2022).

[2] Anna Statsenko, Yoshua Albert Darmawan, Takao Fuji, and Tetsuhiro Kudo, "Midinfrared optical manipulation based on molecular vibrational resonance," Physical Review Applied 18, 054041 (2022).

[1] Roukuya Mamuti, Takao Fuji, and Tetsuhiro Kudo,"Opto-thermophoretic trapping of micro and nanoparticles with a 2 µm Tm-doped fiber laser," Optics Express 29, 38314-38323 (2021).

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