Akira Nagakubo (Assistant professor)
Curriculum Vitae

E-mail：nagakubo prec.eng.osaka-u.ac.jp
Tel　 ：+81-6-6879-7278
Room：M1-523, Engineering
Japanese page

(July 2022)


(Nov. 2016)


(March 2015)


(Sep. 2011)



　【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.


　【Professional experience】
2018 April~ :　　　　　　Assistant Professor. Osaka University, Japan
2017 April - 2018 March: Research Fellow of the Japan Society for the Promotion of Science (Kyoto University, Japan)
2016 Oct. - 2017 March: 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


　【Competitive Honors & Awards】
2021 IPO Outstanding Reviewer Awards 2021
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)


　【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


　【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)

• Research

1. Physical acoustics for thin films studied by picosecond ultrasonics
   
   • A. Nagakubo, H. T. Lee, H. Ogi, T. Moriyama, and T. Ono, Appl. Phys. Lett. 116, 021901 (2020).
     
   • A. Nagakubo, K. Adachi, T. Nishihara, and H. Ogi, Appl. Phys. Express 13, 016504 (2020).
     
   • A. Nagakubo, S. Tsuboi, Y. Kabe, S. Matsuda, A. Koreeda, Y. Fujii, and H. Ogi, Appl. Phys. Lett. 114, 251905 (2019).
     
2. Nano mechanics of superhard materials
   
   • A. Nagakubo, H. T. Lee, H. Ogi, T. Moriyama, and T. Ono, Appl. Phys. Lett. 116, 021901 (2020).
     
   • A. Nagakubo, M. Arita, H. Ogi, H. Sumiya, N. Nakamura, and M. Hirao, Appl. Phys. Lett. 108, 221902 (2016).
     
   • A. Nagakubo, H. Ogi, H. Sumiya, and M. Hirao, Appl. Phys. Lett. 105, 081906 (2014).
     
   • A. Nagakubo, H. Ogi, H. Sumiya, K. Kusakabe, and M. Hirao, Appl. Phys. Lett. 102, 241909 (2013).
     
3. Phonon-magnon interaction studied by femtosecond pulse laser
   
   • K. Tojo, A. Nagakubo, and H. Ogi, Jpn. J. Appl. Phys. 61, SG1007 (2022).
     
4. Sub-THz biosensors
   
   • H. Ogi, S. Iwagami, A. Nagakubo, T. Taniguchi, and T. Ono, Sens. Actuat. B: Chemical 278, 15 (2019).
     
     

• First and/or corresponding papers

1. A. Nagakubo, K. Kanai, H. Tamura, A. Tange, and H. Ogi,
   ‘‘Variable repetition frequency asynchronous optical sampling method without a feedback loop’’
   AIP Adv. 12, 045323 (2022).
   
   
2. K. Tojo, A. Nagakubo, and H. Ogi,
   ‘‘The angular dependence of magnetization dynamics induced by a GHz range strain pulse’’
   Jpn. J. Appl. Phys. 61, SG1007 (2022).
   
   
3. H. Fukuda, A. Nagakubo, and H. Ogi,
   ‘‘Elastic constant of dielectric nano-thin films using three-layer resonance studied by picosecond ultrasonics’’
   Jpn. J. Appl. Phys. 60, SDDA05 (2021).
   
   
4. A. Nagakubo, H. T. Lee, H. Ogi, T. Moriyama, and T. Ono,
   ‘‘Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory’’
   Appl. Phys. Lett. 116, 021901 (2020).
   
   
5. A. Nagakubo, K. Adachi, T. Nishihara, and H. Ogi,
   ‘‘GHz-range resonant ultrasound spectroscopy for a free-standing nano film studied by picosecond ultrasonics’’
   Appl. Phys. Express 13, 016504 (2020).
   
   
6. A. Nagakubo, S. Tsuboi, Y. Kabe, S. Matsuda, A. Koreeda, Y. Fujii, and H. Ogi,
   ‘‘Zero temperature coefficient of sound velocity in vitreous silicon oxynitride thin films’’
   Appl. Phys. Lett. 114, 251905 (2019).
   
   
7. 長久保 白，中島 静香，荻 博次，太田 晃仁
   ‘‘斜方晶構造を有する液晶ポリマーの弾性率計測’’
   超音波テクノ，Vol. 29-5, 99-100 (2017) (解説).
   
   
8. 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).
   
   
9. 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).
   
   
10. 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).
    
    
11. 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).
    
    
12. 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).
    
    
13. 長久保 白，荻 博次，平尾 雅彦
    ‘‘サブTHz超音波を用いた機能性酸化物の音速・減衰の極低温計測’’
    超音波テクノ，Vol. 25-5, 89-92 (2013) (解説).
    
    
14. 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).
    
    
15. 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).
    
    
16. 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).
    
    

• Co-authored paper

1. H. K. Weng, A. Nagakubo, H. Watanabe, and H. Ogi,
   ‘‘Suppression of Brillouin oscillation in transparent free-standing diamond thin films in picosecond ultrasound’’
   Appl. Phys. Lett. 120, 112203 (2022).
   
   
2. H. K. Weng, A. Nagakubo, H. Watanabe, and H. Ogi,
   ‘‘Lattice thermal conductivity in isotope diamond asymmetric superlattices’’
   Jpn. J. Appl. Phys. 61, SG1004 (2022).
   
   
3. W. Yuan, A. Nagakubo, and H. Ogi,
   ‘‘Effect of interfacial damping on high-frequency surface wave resonance on a nanostrip-bonded substrate’’
   131, 015103 (2022).
   
   
4. H. K. Weng, A. Nagakubo, H. Ogi, and H. Watanabe,
   ‘‘Phonon propagation in isotopic diamond superlattices’’
   Phys. Rev. B 104, 054112 (2021).
   
   
5. L. Zhou, F. Kato, N. Nakamura, Y. Oshikane, A. Nagakubo, and H. Ogi,
   ‘‘MEMS hydrogen gas sensor with wireless quartz crystal resonator’’
   Sensor Actuat. B: Chem. 334, 129651 (2021).
   
   
6. H. K. Weng, A. Nagakubo, H. Watanabe, and H. Ogi,
   ‘‘Thermal conduction in isotope diamond thin films studied by pump-probe laser reflectivity measurement’’
   Jpn. J. Appl. Phys. 59, SKKA04 (2020).
   
   
7. L. Zhou, N. Nakamura, A. Nagakubo, and H. Ogi,
   ‘‘Enhancement of sensitivity of Pd-based hydrogen-gas sensor by plasma exposure studied by wireless quartz resonator’’
   Jpn. J. Appl. Phys. 59, SKKB02 (2020).
   
   
8. K. Kusakabe, A. Wake, A. Nagakubo, K. Murashima, M. Murakami, K. Adachi, and H. Ogi,
   ‘Interplanar stiffness in defect-free monocrystalline graphite’’
   Phys. Rev. Materials 4, 043603 (2020).
   
   
9. L. Zhou, N. Nakamura, A. Nagakubo, and H. Ogi
   ‘‘Highly sensitive hydrogen detection using curvature change of wireless-electrodeless quartz resonators’’
   Appl. Phys. Lett. 115, 171901 (2019).
   
   
10. H. Ogi, S. Iwagami, A. Nagakubo, T. Taniguchi, and T. Ono
    ‘‘Nano-Plate Biosensor Array Using Ultrafast Heat Transport through Proteins’’
    Sens. Actuat. B: Chemical 278, 15 (2019).
    
    
11. S. Tsuboi, K. Adachi, A. Nagakubo, and H. Ogi
    ‘‘Theoretical study on elastic properties of Si2N2O by ab-initio calculation’’
    Jpn. J. Appl. Phys., 57, 07LB04 (2018)
    
    
12. E. Oishi, Y. Fujii, D. Katayama, A. Koreeda, A. Nagakubo, and H. Ogi
    ‘‘Phonon anharmonicity in zirconium tungstate single crystal investigated by broadband light scattering‘‘
    Jpn. J. Appl. Phys. 56, 10B06 (2017).
    
    
13. 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).
    
    
14. 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).
    
    
15. 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).
    
    
16. 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).
    
    
17. 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).
    
    
18. 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).

• Seminors

1. ‘‘Mechanical properties of nano objects studied by picosecond ultrasonics’’
   1st(Fri.) Nov. 2019, Institut Teknologi Bandung, Bandung, Indonesia
   
   
2. ‘‘フェムト秒パルスレーザーを用いたサブTHzフォノンの励起・検出’’
   2016年3月8日，京都大学
   
   
3. ‘‘Elasticity measurements by Picosecond ultrasound spectroscopy’’
   18th(Mon.) May 2015, Academy of Sciences of the Czech Republic, Prague, Czech Republic
   
   

• Conference

1. 184th Meeting of the Acoustical Society of America
   “In-situ monitoring of electromigration in a single nano wire by picosecond ultrasonics”
   8th(Mon.) - 12th(Fri.) May 2023, Chicago Downtown Marriott Magnificent Mile Hotel, Illinois, USA
   
   
2. 2022 IEEE International Ultrasonics Symposium
   “GHz phonon biosensor using free-standing SiN nanofilm with real-time monitoring by asynchronous optical sampling picosecond ultrasonics”
   10th(Mon.) - 13th(Thur.) Oct. 2022, Venice Convention Center, Venice, Italy
   
   
3. 2019 IEEE International Ultrasonics Symposium
   “Relationship between Temperature Coefficient of Sound Velocity and Bond Angle in Vitreous SiO₂-Type Films”
   6th(Sun.) - 9th(Wed.) Oct. 2019, SEC, Glasgow, Scotland, UK
   
   
4. 2019 International Congress on Ultrasonics
   “Time-range controllable asynchronous picosecond ultrasonics with titanium-sapphire pulse lasers”
   3rd(Tue.) Sep. - 6th(Fri.) Sep. 2019,
   　　　　　Hawaii Convention Center, Honolulu, USA
   
   
5. The 39th Symposium on Ultrasonic Electronics
   “Resonance frequencies of AlN and metal freestanding multilayers studied by picosecond ultrasonics”
   29th(Mon.) Oct. - 31th(Wed.) Oct. 2018,
   　　　　　Doshisha University, Kyoto, Japan
   
   
6. 2018年秋季 第79回 応用物理学会秋季学術講演会
   「ピコ秒超音波法を用いたa及びb型タングステンナノ薄膜の弾性率計測および重水素照射による機械特性の変化」
   2018年9月18～21日，名古屋国際会議場
   
   
7. 2017 International Congress on Ultrasonics
   “Guide wave excitation and detection in a single nanowire”
   18th(Mon.) Dec. - 20th(Wed.) Dec. 2017,
   　　　　　Hawaii Convention Center, Honolulu, USA
   
   
8. The 38th Symposium on Ultrasonic Electronics
   “Elastic constant of alpha and beta tungsten films studied by picosecond ultrasonics”
   25th(Wed.) Oct. - 27th(Fri.) Oct. 2017,
   　　　　　Tagajo City Cultural Center, Miyagi, Japan
   
   
9. 5th Joint Meeting of the Acoustical Society of America and Acoustical Society of Japan
   “Discussion on very small temperature dependence of diamond's elastic constants”
   28th(Mon.) Nov. - 2nd(Fri.) Dec. 2016,
   　　　　　Hilton Hawaiian Village Waikiki Beach Resort, Honolulu, USA
   
   
10. The 37th Symposium on Ultrasonic Electronics
    “Wave-propagation properties of alpha and beta Lanthanum studied by ab-initio calculations”
    16th(Wed.) - 18th(Fri.) Nov. 2016, Pukyong National University, Busan, Korea
    
    
11. The 36th Symposium on Ultrasonic Electronics
    “Guided wave propagation in a 2-D patterned nano-bridge studied by picosecond ultrasonics”
    5th(Thurs.) - 7th(Sat.) Nov. 2015, Epochal Tsukuba, Ibaraki, Japan
    
    
12. 9th International Conference on New Diamond and Nano Carbons 2015
    “The apparent Hall-Petch effect of nano-polycrystalline cubic boron nitrides”
    24th(Sun.) - 28th(Thurs.) May 2015, Shizuoka GRANSHIP, Shizuoka, Japan
    
    
13. 2015 International Congress on Ultrasonics
    “Precise measurement of sound velocity of amorphous silica
    　　　　　at low temperatures by picosecond ultrasounds: correction of static heating effect”
    10th(Sun.) - 14th(Thurs.) May 2015, Arsenal, Metz, Flance
    
    
14. TMS (The Minerals, Metals and Materials Society) 2015, 144th annual Meeting
    “Elastic stiffness of cubic and wurtzite boron nitride”
    15th(Mon.) - 19th(Thurs.) March 2015,
    　　　　　Walt Disney World Swan and Dolphin Resort, Orland, Florida, USA
    
    
15. 2015年春季 第62回 応用物理学会春季学術講演会
    「極低温ピコ秒超音波法を用いた異なるキャリア密度のGaNに対するキャリアダイナミクスの観測」
    2015年3月11～14日，東海大学 湘南キャンパス(招待講演)
    
    
16. The 35th Symposium on Ultrasonic Electronics
    “Acoustic properties of co-doped AlN thin films
    　　　　　at low temperatures studied by picosecond ultrasonics”
    3rd(Wed.) - 5th(Fri.) Dec. 2014, Meiji University, Tokyo, Japan
    ↑奨励賞受賞！
    
    
17. 2014年秋季 第75回 応用物理学会学術講演会
    「極低温ピコ秒超音波法を用いたGaNのキャリアダイナミクスの観測と圧電定数計測」
    2014年9月17～20日，北海道大学
    ↑奨励賞受賞！
    
    
18. 2014 IEEE International Ultrasonics Symposium
    “Temperature coefficients of fluorine-doped amorphous-SiO₂ thin films
    　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　measured by picosecond ultrasonics”
    3rd(Thurs.) - 6th(Mon.) September 2014, Hilton Hotel Chicago, Chicago, Illinois, USA
    
    
19. The 34th Symposium on Ultrasonic Electronics
    “Acoustic properties of fluorine-doped silica-glass thin filmsat low temperatures”
    20th(Wed.) - 22th(Fri.) Nov. 2013, Doshisha University, Kyoto, Japan
    
    
20. 2013 International Congress on Ultrasonics
    “Measurement and Calculation of Elastic Constants of Boron Nitrides”
    2nd(Wed.) - 5th(Sun.) May 2013
    　　　　　Grand Copthorne Waterfront Hotel, Singapore, Singapore
    
    
21. The 33rd Symposium on Ultrasonic Electronics
    “Sub-terahertz-frequency attenuation and sound velocity of GaN
    　　　　　at Cryogenic Temperatures Studied by Picosecond Ultrasound Spectroscopy”
    13th(Tue.) - 15th(Thurs.) Nov. 2012, Chiba University, Chiba, Japan
    
    
22. 2012年秋季 第73回 応用物理学会学術講演会
    「極低温域における圧電体・誘電体に対するサブTHz超音波の減衰計測」
    2012年9月11～14日，愛媛大学
    
    
23. Quantitative Nondestructive Evaluation (QNDE) 2012
    “Study of Phase Transition in SrTiO₃
    　　　　　Using Ultrasonic Attenuation at Sub-Terahertz Region”
    15th(Mon.) - 20th(Fri.) July. 2012
    　　　　　Hyatt Regency Denver Tech Center, Denver, Colorado, USA
    
    
24. Materials Research Society(MRS) Fall Meeting 2011
    “Elastic Constants of Boron Nitrides at Cryogenic Temperature”
    28th(Mon.) Nov. - 2nd(Fri.) Dec. 2011
    　　　　　Hynes Convention Center, Boston, Massachusetts, USA
    
    
25. The 32nd Symposium on Ultrasonic Electronics
    “Monitoring of sound velocity and attenuation in SrTiO₃
    　　　　　across the phase transition at low temperature using picosecond ultrasonics”
    8th(Tue.) - 10th(Thurs.) Nov. 2011, Kyoto University, Kyoto, Japan
    
    
26. 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 Nitrides”
    19th(Mon.) - 21th(Wed.) Sep. 2011
    　　　　　Kobe International Conference Center, Kobe, Japan
    
    
27. 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 Calculation”
    16th(Mon.) - 20th(Fri.) May 2011, Kunibiki Messe, Shimane, Japan
    
    
28. 2011年春季 第58回 応用物理学関係連合講演会(震災のため口頭発表及び質疑応答は中止)
    「高純度BN多結晶体の超高弾性とその極低温計測:ピコ秒超音波計測と第一原理計算」
    2011年3月24～27日，神奈川工科大学
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