Akira Nagakubo (Extraordinari assistant professor)
Japanese page
Curriculum Vitae


E-mail:akira.nagakubo abc.me.es.osaka-u.ac.jp
Tel  :+81-6-6850-6186
Room:Engineering Science, A328-330

(Sep. 2011)


(March 2015)



 ã€￾Education】
2014 March D. in Engineering (GPA: 3.8/4.0), Graduate School of Engineering Science, Osaka Univ.
2011 March B. in Engineering (GPA: 3.9/4.0), School of Engineering Science, Osaka Univ.


 ã€￾Professional experience】
2016 Oct. -:      Extraordinary Assistant Professor. Osaka University, Japan
2016 April ~ 2016 Sep.: Visiting Scientist. Los Alamos National Laboratory, USA
2016 April ~ 2016 Sep.: Adjunct Researcher. Osaka University, Japan
2015 April - 2016 March: Extraordinary assistant professor (Osaka University, Japan)
2012 April - 2015 March: Research Fellow of the Japan Society for the Promotion of Science


 ã€￾Teaching experience】
School students; Synthetic Exercises in Mechanical Engineering (ultrasonics testing)
School students; Experiments in Mechanical Engineering (tensile test for steels)


 ã€￾Competitive Honors & Awards】
2014 Young Scientist Award at Symposium on Ultrasonic Electronics,
          The 35th Symposium on Ultrasonic Electronics
          (10 awardees from 270 presentations)
2014 37th Young Scientist Oral Presentation Award,
          The 75th Japan Society of Applied Physics Autumn Meeting 2014
          (40 awardees from 3850 presentations)
2013 Encouraging prize for international conference presentation
          Association for the Advancement of Manufacturing and Technology
          (about a dozen awardees for each year)
2011 Graduate school of Engineering Science prize, Osaka University (The top graduate)
2010 Eji muto excellent student prize, Japan Society for Design Engineering (The top graduate)
2010 School of Engineering Science prize, Osaka University (The top graduate)


 ã€￾Scholarship (not student loans)】
2012 Excellent educational achievement scholarship, Japan Student Services Organization
2011 Micron scholarship, Micron Technology, Inc. (for excellence in academics and leadership)
2008 Cultural education scholarship, Osaka University


 ã€￾Grants】
2015 April - 2017 March: Grant-in-Aid for Young Scientists B
         Amount: 3.2 million JPY
         Funding Agency: Japan Society for the Promotion of Science (JSPS)
2012 April - 2015 March: Grant-in-Aid for JSPS Fellows
         Amount: 3 million JPY
         Funding Agency: Japan Society for the Promotion of Science (JSPS)


  • Publications (peer reviewed)
  1. H. Ogi, T. Ishihara, H. Ishida, A. Nagakubo, N. Nakamura, and M. Hirao
    ‘‘Thermal Mode Spectroscopy for Thermal Diffusivity of Millimeter-Size Solids‘‘
    Phys. Rev. Lett. 117, 195901 (2016).

  2. K. Adachi, H. Ogi, A. Nagakubo, N. Nakamura, M. Hirao, M. Imade, M. Yoshimura, and Y. Mori
    ‘‘Piezoelectric coefficients of GaN determined by hopping conduction of carriers‘‘
    Appl. Phys. Lett. 109, 182108 (2016).

  3. K. Adachi, H. Ogi, A. Nagakubo, N. Nakamura, M. Hirao, M. Imade, M. Yoshimura, and Y. Mori
    ‘‘Elastic constants of GaN between 10 and 305 K‘‘
    J. Appl. Phys. 119, 245111 (2016).

  4. A. Nagakubo, M. Arita, H. Ogi, H. Sumiya, N. Nakamura, and M. Hirao
    ‘‘Elastic constant C11 of 12C diamond between 10 and 613 K’’
    Appl. Phys. Lett. 108, 221902 (2016).

  5. H. Ogi, S. Masuda, A. Nagakubo, N. Nakamura, M. Hirao, K. Kondou, and T. Ono
    ‘‘Impact of interface stiffness in surface-wave resonances on nano-strip-attached substrates’’
    Phys. Rev. B 93, 024112 (2016).

  6. A. Nagakubo, H. Ogi, and M. Hirao
    ‘‘Refractive index and extinction coefficient of Si at 400 nm between 10 and 300 K’’
    Jpn. J. Appl. Phys. 54, 128001 (2015).

  7. A. Nagakubo, H. Ogi, H. Ishida, M. Hirao, T. Yokoyama, and T. Nishihara
    ‘‘Temperature behavior of sound velocity of fluorine-doped vitreous silica thin films studied by picosecond ultrasonics’’
    J. Appl. Phys. 118, 014307 (2015).

  8. A. Nagakubo, M. Arita, T. Yokoyama, S. Matsuda, M. Ueda, H. Ogi, and M. Hirao
    ‘‘Acoustic properties of co-doped AlN thin films at low temperatures studied by picosecond ultrasonics’’
    Jpn. J. Appl. Phys. 54, 07HD01 (2015).

  9. H. Ogi, Y. Tsutsui, N. Nakamura, A. Nagakubo, M. Hirao, M. Imade, M. Yoshimura, and Y. Mori
    ‘‘Hopping conduction and piezoelectricity in Fe-doped GaN studied by non-contacting resonant ultrasound spectroscopy’’
    Appl. Phys. Lett. 106, 091901 (2015).

  10. A. Nagakubo, H. Ogi, H. Sumiya, and M. Hirao
    ‘‘Elasticity and hardness of nano-polycrystalline boron nitrides: The apparent Hall-Petch effect’’
    Appl. Phys. Lett. 105, 081906 (2014).

  11. M. Tane, Y. Okuda, Y. Todaka, H. Ogi, and A. Nagakubo
    ‘‘Elastic properties of a single-crystalline ω phase in titanium’’
    Acta Mater. 61, 7543 (2013).

  12. A. Nagakubo, H. Ogi, M. Hirao
    ‘‘Sound velocity and acoustic attenuation of functional oxsides at cryogenic temperature studied by sub-THx ultrasound’’
    Ultrasonic Technology,Vol. 25-5, 89-92 (2013) (review).

  13. A. Nagakubo, H. Ogi, H. Sumiya, K. Kusakabe, and M. Hirao
    ‘‘Elastic constants of cubic and wurtzite boron nitrides ’’
    Appl. Phys. Lett. 102, 241909 (2013).

  14. A. Nagakubo, A. Yamamoto, K. Tanigaki, H. Ogi, N. Nakamura, and M. Hirao
    ‘‘Monitoring of the Low-Temperature Phase Transitions of SrTiO3 Using Picosecond Ultrasound Spectroscopy’’
    Jpn. J. Appl. Phys. 51, 07GA09 (2012).

  15. A. Nagakubo, K. Tanigaki, H. Ogi, M. Hirao, H. Sumiya and K. Harano
    ‘‘Picosecond Ultrasound Spectroscopy for High Purity Boron Nitrides’’
    Proceedings of ATEM’11, OS02F023 (2011).


  • Invited Talks/ Presentations/ Seminars
  1. Seminar,
    “Sub-THz pump-probe ultrasonics using femtosecond pulsed laserâ€￾
    8th(Mon.) March, 2016,Kyoto University, Kyoto, Japan

  2. International seminar,
    “Elasticity measurements by Picosecond ultrasound spectroscopyâ€￾
    18th(Mon.) May 2015, Academy of Sciences of the Czech Republic, Prague, Czech Republic

  3. The 62nd JSPS (the Japan Society of Applied Physics) Spring Meeting 2015,
    “Low-temperature carrier dynamics in different-carrier-concentration GaN
                       studied by picosecond ultrasound spectroscopyâ€￾
    11th(Wen.) - 14th(Sta.), Tokai University, Kanagawa, Japan



  • Conferences
  1. 5th Joint Meeting of the Acoustical Society of America and Acoustical Society of Japan
    “Discussion on very small temperature dependence of diamond's elastic constantsâ€￾
    28th(Mon.) Nov. - 2nd(Fri.) Dec. 2016,
         Hilton Hawaiian Village Waikiki Beach Resort, Honolulu, USA

  2. The 37th Symposium on Ultrasonic Electronics
    “Wave-propagation properties of alpha and beta Lanthanum studied by ab-initio calculationsâ€￾
    16th(Wed.) - 18th(Fri.) Nov. 2016, Pukyong National University, Busan, Korea

  3. The 36th Symposium on Ultrasonic Electronics
    “Guided wave propagation in a 2-D patterned nano-bridge studied by picosecond ultrasonicsâ€￾
    5th(Thurs.) - 7th(Sat.) Nov. 2015, Epochal Tsukuba, Ibaraki, Japan

  4. 9th International Conference on New Diamond and Nano Carbons 2015
    “The apparent Hall-Petch effect of nano-polycrystalline cubic boron nitridesâ€￾
    24th(Sun.) - 28th(Thurs.) May 2015, Shizuoka GRANSHIP, shizuoka, Japan

  5. 2015 International Congress on Ultrasonics
    “Precise measurement of sound velocity of amorphous silica
         at low temperatures by picosecond ultrasounds: correction of static heating effectâ€￾
    10th(Sun.) - 14th(Thurs.) May 2015, Arsenal, Metz, France

  6. TMS (The Minerals, Metals and Materials Society) 2015, 144th annual Meeting
    “Elastic stiffness of cubic and wurtzite boron nitrideâ€￾
    15th(Mon.) - 19th(Thurs.) March 2015,
         Walt Disney World Swan and Dolphin Resort, Orland, Florida, USA

  7. The 35th Symposium on Ultrasonic Electronics
    “Acoustic properties of co-doped AlN thin films
         at low temperatures studied by picosecond ultrasonicsâ€￾
    3rd(Wed.) - 5th(Fri.) Dec. 2014, Meiji University, Tokyo, Japan
    ↑Received an Awardï¼￾

  8. 2014年秋季 第75回 応用物ç￾†å­¦ä¼šå­¦è¡“講演会
    「極低温ピコ秒超音波法を用ã￾„ã￾ŸGaNã￾®ã‚­ãƒ£ãƒªã‚¢ãƒ€ã‚¤ãƒŠãƒŸã‚¯ã‚¹ã￾®è¦³æ¸¬ã￾¨åœ§é›»å®šæ•°è¨ˆæ¸¬ã€￾
    2014å¹´9月17~20日,北海é￾“大学
    ↑Received an Awardï¼￾

  9. 2014 IEEE International Ultrasonics Symposium
    “Temperature coefficients of fluorine-doped amorphous-SiO2 thin films
                               measured by picosecond ultrasonicsâ€￾
    3rd(Thurs.) - 6th(Mon.) September 2014, Hilton Hotel Chicago, Chicago, Illinois, USA

  10. The 34th Symposium on Ultrasonic Electronics
    “Acoustic properties of fluorine-doped silica-glass thin films at low temperaturesâ€￾
    20th(Wed.) - 22th(Fri.) Nov. 2013, Doshisha University, Kyoto, Japan

  11. 2013 International Congress on Ultrasonics
    “Measurement and Calculation of Elastic Constants of Boron Nitridesâ€￾
    2nd(Wed.) - 5th(Sun.) May 2013
         Grand Copthorne Waterfront Hotel, Singapore, Singapore

  12. The 33rd Symposium on Ultrasonic Electronics
    “Sub-terahertz-frequency attenuation and sound velocity of GaN
         at Cryogenic Temperatures Studied by Picosecond Ultrasound Spectroscopyâ€￾
    13th(Tue.) - 15th(Thurs.) Nov. 2012, Chiba University, Chiba, Japan

  13. 2012年秋季 第73回 応用物ç￾†å­¦ä¼šå­¦è¡“講演会
    「極低温域ã￾«ã￾Šã￾‘る圧電体・誘電体ã￾«å¯¾ã￾™ã‚‹ã‚µãƒ–THz超音波ã￾®æ¸›è¡°è¨ˆæ¸¬ã€￾
    2012年9月11~14日,愛媛大学

  14. Quantitative Nondestructive Evaluation (QNDE) 2012
    “Study of Phase Transition in SrTiO3
         Using Ultrasonic Attenuation at Sub-Terahertz Regionâ€￾
    15th(Mon.) - 20th(Fri.) July. 2012
         Hyatt Regency Denver Tech Center, Denver, Colorado, USA

  15. Materials Research Society(MRS) Fall Meeting 2011
    “Elastic Constants of Boron Nitrides at Cryogenic Temperatureâ€￾
    28th(Mon.) Nov. - 2nd(Fri.) Dec. 2011
         Hynes Convention Center, Boston, Massachusetts, USA

  16. The 32nd Symposium on Ultrasonic Electronics
    “Monitoring of sound velocity and attenuation in SrTiO3
         across the phase transition at low temperature using picosecond ultrasonicsâ€￾
    8th(Tue.) - 10th(Thurs.) Nov. 2011, Kyoto University, Kyoto, Japan

  17. International Conference on Advanced Technology in Experimental Mechanics 2011
         The 10 th Annual Conference of the Asian Society
         on Experimental Mechanics (ATEM10)
    “Picosecond Ultrasound Spectroscopy for High Purity Boron Nitridesâ€￾
    19th(Mon.) - 21th(Wed.) Sep. 2011
         Kobe International Conference Center, Kobe, Japan

  18. 5th International Conference on New Diamond and Nano Carbons 2011
    “Elasticity of High Purity Boron Nitrides at Cryogenic Temperatures
         Studied by Picosecond Laser Ultrasound and ab-initio Calculationâ€￾
    16th(Mon.) - 20th(Fri.) May 2011, Kunibiki Messe, Shimane, Japan

  19. 2011年春季 第58回 応用物ç￾†å­¦é–¢ä¿‚連å￾ˆè¬›æ¼”会(震ç￾½ã￾®ã￾Ÿã‚￾å￾£é ­ç™ºè¡¨å￾Šã￾³è³ªç–‘応答ã￾¯ä¸­æ­¢)
    「高純度BN多çµ￾晶体ã￾®è¶…高弾性ã￾¨ã￾￾ã￾®æ¥µä½Žæ¸©è¨ˆæ¸¬:ピコ秒超音波計測ã￾¨ç¬¬ä¸€åŽŸç￾†è¨ˆç®—ã€￾
    2011å¹´3月24~27日,神奈å·￾工科大学