Kyushu University Academic Staff Educational and Research Activities Database
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Akira Harata Last modified date:2024.04.02

Graduate School
Undergraduate School
Other Organization
Administration Post
Vice President
Director of the SHARE Office

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Harata Laboratory, Department of Interdisciplinary Engineering Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University .
Faculty, Researchers & Staff, Kyushu University Institute for Asian and Oceanian Studies .
Energy and Society Cluster, Kyushu University Platform of Inter-/Transdisciplinary Energy Research .
Member list, Transdisciplinary Research and Education Center for Green Technologies, Kyushu University .
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
Field of Specialization
Analytical chemistry
Total Priod of education and research career in the foreign country
Outline Activities
Laser-based analytical chemistry for ultrasensitive detection of environmentally and biologically important chemical species in a liquid phases.
Ultrasensitive detection of non-luminescent molecules in solutions by photoacoustic and thermal lensing methods.
Study of molecules on water by using nonlinear laser spectroscopy (second harmonic generation & multiphoton ionization).
Study of molecules on water by using synchrotron radiation.
Femtochemstry at interfaces based on development of ultrafast photothermal spectroscopy.
Cell diagnostics with a laser fluorescence and photothermal microscopy.
Quantitative nondestructive evaluation and depth profiling of materials.
"Analytical Chemistry", "Quantum Chemistry", "Molecular Spectroscopy", and "Laser Chemistry" for graduate students, and "Introduction of Optical Spectroscopy" and "Excesise of Applied Mathmatics" for undergraduate students.
Member of 8 academic societies.
Research Interests
  • Novel approach for spectroscopic molecule detection: Pioneering multicolor multiphoton photothermal spectroscopy
    keyword : two-color two-photon excitation, photothermal, ultrasensitive detection, non-florecent chemicals, liquid-solution physical chemistry
  • Developement of X-ray and visible-ultraviolet correlation spectroscopy
    keyword : X-ray, visible-ultraviolet, correlation spectroscopy, iron, catalyst
  • Laser-based methodology for ultrasensitive detection of non-luminescent molecules in liquid solutions and its application to separation analysis

    keyword : multicolor-enhance photothermal detection, yoctomole chemistry, nonradiative process, biological cells, micro-HPLC
  • ultrasensitive imaging of non-fluorescent chemicals in single biological cells
    keyword : biological cells, non-fluorescent chemicals, imaging, yeast
  • Study of solute molecules on water by using nonlinear laser spectroscopy (second harmonic generation & multiphoton ionization) and synchrotron radiation
    keyword : confocal fluorescent microscopy, nonlinear laser spectroscopy(second harmonic generation, multiphoton ionization), synchrotron radiation
  • Femtosecond time-resolved absorption/reflection spectroscopes for laser ablation of a metal in a liquid
    keyword : transient grating, transient lensing, transient reflection, liquid/solid-electrode interface
Academic Activities
1. Shiori Sakurai, Miki Isoda, Akira Harata, Two-photon photoacoustic spectroscopy of liquid solutions under degenerate and non-degenerate laser excitation, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.35848/1347-4065/acb063, 62, SJ, 2023.07, A new apparatus to measure the two-photon (2P) absorption of a dilute liquid solution is designed using tunable laser excitation with an optical parametric oscillator and photoacoustic (PA) detection. Two-photon absorption of non- or less-fluorescent solute molecules in dilute liquid solutions was investigated. When PA signal intensity was plotted versus half of an excitation laser wavelength, a degenerate 2P PA spectrum of nitrobenzene showed a shape similar to that of the absorption spectrum, as expected from Laporte's selection rule, with a slight red shift. The non-degenerate 2P PA spectrum of diphenylacetylene was compared with the degenerate 2P PA spectrum and good matching was observed. Results demonstrate that this method is suitable for observing 2P absorption for weakly fluorescent substances..
2. @Miki ISODA, Toshihiko ABE, Kai AOKI and Akira HARATA, Ultraviolet and Deep-Ultraviolet Excitation Photothermal Heterodyne Interferometer Combined with Semi-Micro HPLC, Analytical Sciences, 10.2116/analsci.20P328, 37, 6, 911-916, 2021.06, A detection system consisting of a photothermal heterodyne interferometer (PHI) combined with semi-micro HPLC (high-performance liquid chromatography) has been designed and investigated. An ultraviolet (UV) or deep-UV laser emitting at 375 or 213 nm, respectively, was used for the excitation of nitro-polycyclic aromatic hydrocarbons (NPAHs) and amino acids. A photothermally induced change in the refractive index of the solvent causes an optical phase difference between two arms of the interferometer, one beam passing through the photoexcited region and another used as a reference, which was sensitively detected with the PHI. The separation and detection of NPAHs and amino acids were successfully demonstrated via semi-micro HPLC with the PHI and a UV detector. The detection limits of the UVexcitation PHI for NPAHs were 1.2 – 5.2 times better than that of the commercial UV detector, although the first demonstration of deep-UV excitation suffered from significant baseline fluctuation..
3. @Miki ISODA, Makoto FUKUMA, and Akira HARATA, Ultraviolet-Excitation Photothermal Heterodyne Interferometer as a Micro-HPLC Detector, Analytical Sciences, 10.2116/analsci.19P190, 35, 12, 1311-1315, 2019.12, The first demonstration of a photothermal heterodyne interferometer (PHI) combined with micro-HPLC (high-performance liquid chromatography) is reported. A semiconductor laser (375 nm) was used for excitation, and the temperature change caused by heat released from photoexcited species was detected with a He–Ne laser (632.8 nm). The temperature-dependent refractive index change of the solvent modified the optical path of the probe beam. The phase difference between two arms of the interferometer, one passing through the heated sample and another as a reference, was sensitively detected with the PHI. The nitro-polycyclic aromatic hydrocarbon and vitamin mixture separated via micro-HPLC was successfully detected with the PHI as well as a UV detector. The detection limit of the PHI for riboflavin in the absorbance units was 77 times better than that of the commercial UV detector. The detection limit of the PHI with a small flow cell (6 nL) was the same as that with a large flow cell (18 nL) for 1-nitropyrene..
4. Akira HARATA, Kenji FUKUSHIMA, and Yoshihiko HATANO, Magnification in Excess of 100 Times of a Microscopic Photothermal Lensing Signal from Solute Molecules by Two-Color Excitation with Continuous-Wave Lasers, Anal. Sci., 18巻1367-1373号, 2002.12.
5. Xue-Ying ZHENG and Akira HARATA, Confocal Fluorescence Microscope Studies of the Adsorptive Behavior of Dioctadecyl-Rhodamine B Molecules at a Cyclohexane-Water Interface, Anal. Sci, 10.2116/analsci.17.131, 17, 1, 131-135, 17巻131-135頁, 2001.01.
6. Miki SATO, Takeshi KAIEDA, Kohshin OHMUKAI, Hirofumi KAWAZUMI, Akira HARATA, and Teiichiro OGAWA, Acid-Base Equilibrium Constants at the Water Surface and Distribution Coefficients between the Surface and the Bulk as Studied by the Laser Two-Photon Ionization Technique, J. Phys. Chem., 10.1021/jp001646g, 104, 42, 9873-9877, 104巻42号9873-9877頁, 2000.11.
7. Akira HARATA, Naoyasu ADACHI, and Tsuguo SAWADA, Sub-Nanosecond Transient Reflecting Grating Measurements and Depth Profiling Analysis of Mesoscopic Subsurface Properties of a Nickel Single Crystal, Phys. Rev. B, 10.1103/PhysRevB.58.7319, 58, 11, 7319-7327, 58巻11号7319-7327頁, 1998.10.
8. Yao Qun LI, Shin-ya SASAKI, Takanori INOUE, Akira HARATA, and Teiichiro OGAWA, Spatial Imaging Identification in a Fiber-Bundle Confocul Fluorescence Microspectrometer, Appl. Spectrosc., 10.1366/0003702981944832, 52, 8, 1111-1114, 52巻8号1111-1114頁, 1998.08.
9. Kazuki ITO, Makiko MUTOH, Akira HARATA, and Tsuguo SAWADA, Ultrafast Lensing Effect of β-carotene in n-Hexane Solution, Chem. Phys. Lett., 275巻3-4号349-354頁, 1997.08.
10. Takayuki TANAKA, Akira HARATA, and Tsuguo SAWADA, Imagings of Picosecond-Photoexcited Carriers and Enhanced Auger Recombination Rate by Transient Reflecting Grating Measurements, Jpn. J. Appl. Phys., 35巻3642-3647頁, 1996.07.
11. Takuya SHIMOSAKA, Takehiko KITAMORI, Akira HARATA, and Tsuguo SAWADA, Fuzzy Linear Regression Method in Ultratrace Analysis and Analytical Interpretation, Anal. Sci., 12巻385-391頁, 1996.05.
12. Tsuguo SAWADA and Akira HARATA, GHz Ultrasonic Micro-Spectroscopy of Surfaces Using Transient Reflecting Gratings, Proceedings of 15th International Congress on Acoustics, 417-420 (1995, Trondheim, Norway),, 1995.12.
13. Hiroyuki NISHIMURA, Akira HARATA, and Tsuguo SAWADA, Fast Photothermal Relaxation Processes in Metals and Semiconductors Studied Using Transient Reflecting Grating, Jpn. J. Appl. Phys., 32巻5149-5154頁, 1993.09.
14. Satoshi TAKAHASHI, Akira HARATA, Takehiko KITAMORI, and Tsuguo SAWADA, In-Situ Monitoring of Monolayer Formation on Chemically Oscillating Oil/Liquid Interface by Quasielastic Laser Scattering, Anal. Sci., 7巻Supplment. 645-648頁, 1991.09.
15. Yu-Ming HSUEH, Akira HARATA, Takehiko KITAMORI, and Tsuguo SAWADA, Photoacoustic Determination of Trace Species Absorbed on a Single Microparticle, Anal. Sci., 6巻67-70頁, 1990.11.
16. Akira HARATA and Tsuguo SAWADA, Photoacoustic Quantitative Depth Profiling of an Ion-Pair Absorbed Polyvinylchloride Film Using an Approximation of the Inverse Laplace Transform, Opt. Sci., 62巻64-66頁, 1990.08.
Membership in Academic Society
  • Japan Society for Molecular Sciences
  • American Chemical Society
  • The Chemical Society of Japan
  • The Japan Society of Analytical Chemistry
  • The Japan Society of Applied Physics
  • The Surface Science Society of Japan
  • Spectroscopical Society of Japan
  • Japanese Society of Radiation Chemistry
Educational Activities
"Essential Points of Interdisciplinary Engineering Sciences id-ej" (Course both for international and domestic graduate students),
"Essentials of Analytical Chemistry ei" (Course both for international and domestic graduate students),
"Basic Physical Chemistry I" (Course for international graduate students),   
"Analytical Chemistry" (Course for graduate students),
"Laser Chemistry" (Course for graduate students),
"Molecular Spectroscopy" (Course for graduate students),
"Instrumental Analysis" (Course for graduate students),
"Introduction of Molecular and Material Sciences" (Course for graduate students),
"Introduction of Optical Spectroscopy" (Course for undergraduate students), etc.
Other Educational Activities
  • 2020.10, The head of the SHARE Office: a program promotion office of 'Strategic Hub Area for top-global Research and Education - Kyushu University'.
  • 2012.10, Program coordinator or director of the Program for Leading Graduate Schools - Advanced Graduate Course in Global Strategy for Green Asia.
  • 2008.07, Education program staff of the Global COE - Nobel Carbon Resource Sciences.
  • 2006.11, Vice Director (Oct. 2006-March 2008), Program for the strategic education of material science oriented creative researchers in "Initiatives for Attractive Education in Graduate Schools” by the Japan Society for the Promotion of Science (JSPS).