業績(学術論文)

  1. Wide-field fluorescent nanodiamond spin measurements toward realtime and large-area intracellular quantum thermometry 

    Yushi Nishimura, Keisuke Oshimi, Yumi Umehara, Yuka Kumon, Kazu Miyaji, Hiroshi Yukawa, Yutaka Shikano, Tsutomu Matsubara, Masazumi Fujiwara, Yoshinobu Baba, and Yoshio Teki, 
    MS ready for submission.
     

  2. Real-time estimation of the optically detected magnetic resonance shift in diamond quantum thermometry
    Masazumi Fujiwara, Alexander Dohms, Ken Suto, Yushi Nishimura, Keisuke Oshimi, Yoshio Teki, 

    Kai Cai, Oliver Benson, and Yutaka Shikano, 
    MS ready for submission. 
     

  3. Real-time nanodiamond thermometry probing in-vivo thermogenic responses
    Masazumi Fujiwara, Simo Sun, Alexander Dohms, Yushi Nishimura, Ken Suto, Yuka Takezawa, Keisuke Oshimi, Li Zhao, Nikola Sadzak, Yumi Umehara, Yoshio Teki, Naoki Komatsu, Oliver Benson, Yutaka Shikano, and Eriko Kage-Nakadai,
    arXiv:2001.02844 (2020).
     

  4. Quantum thermometric sensing and analysis system using fluorescent nanodiamonds for the evaluation of the living stem cell function according to intracellular temperature

    Hiroshi Yukawa, Masazumi Fujiwara, Kaori Kobayashi, Yuka Kumon,  Kazu Miyaji, Yushi Nishimura, Keisuke Oshimi, Yumi Umehara, Yoshio Teki, Takayuki Iwasaki, Mutsuko Hatano, 
    Hideki Hashimoto and Yoshinobu Baba, 
    Nanoscale Adv. accepted.
     

  5. Removing Non-Size-Dependent Electron Spin Decoherence of Nanodiamond Quantum Sensors by Aerobic Oxidation

    Ryuta Tsukahara, Masazumi Fujiwara, Yoshihiko Sera, Yushi Nishimura, Yuko Sugai, Christian Jentgens, Yoshio Teki, Hideki Hashimoto, Shinichi Shikata,  

    ACS Appl. Nano Mat. 2, 3701-3710 (2019).
     

  6. Monitoring spin coherence of single nitrogen-vacancy centers in nanodiamonds during pH changes in aqueous buffer solutions

    Masazumi Fujiwara, Ryuta Tsukahara, Yoshihiko Sera, Hiroshi Yukawa, Yoshinobu Baba,Shinichi Shikata, and Hideki Hashimoto, 

    RSC Adv. 9, 12606-12614 (2019).
     

  7. Particle size effects of tetrahedron-shaped Ag3PO4 photocatalyst on water-oxidation activity and carrier recombination dynamics
    Ryo Miyasato, Masazumi Fujiwara, Haruyuki Sato, Toshihiro Yano, and Hideki Hashimoto,
    Chem. Phys. Lett. X 2, 100023 (2019).
     

  8. Observation of the linewidth broadening of single spins in diamond nanoparticles in aqueous fluid and its relation to the rotational Brownian motion

    Masazumi Fujiwara, Yutaka Shikano, Ryuta Tsukahara, Shinichi Shikata, and Hideki Hashimoto,

    Sci. Reports 8, 14773 (2018).
     

  9. Correlation between surface carrier dynamics and water oxidation activity of commercially available rutile-type TiO2 powders
    Ryo Miyasato, Masazumi Fujiwara, Haruyuki Sato, Toshihiro Yano, Hideki Hashimoto,

    Chem. Phys. Lett. 712, 123-127 (2018).
     

  10. Surface and bulk carrier recombination dynamics of rutile type TiO2 powder as revealed by sub-ns time-resolved diffuse reflection spectroscopy

    R. Miyasato, H. Sato, T. Yano, M. Fujiwara, and H. Hashimoto,

    J. Photochem. Photobiol. A  358, 452-458 (2018).
     

  11. Fiber-coupled diamond micro-waveguides toward an efficient quantum interface for spin defect centers

    M. Fujiwara, O. Neitzke, T. Schröder, A. W. Schell, J. Wolters, J. Zheng, S. Mouradian, M. Almoktar,
    S. Takeuchi, D. Englund, O. Benson,
    ACS Omega 2, 7194-7202 (2017).
     

  12. Strategies to enhance the excitation energy-transfer efficiency in the light-harvesting system using the intra-molecular charge transfer character of carotenoids
    N. Yukihira Y. Sugai, M. Fujiwara, D. Kosumi, M. Iha, K. Sakaguchi, S. Katsumura, A. T. Gardiner,

    R. J. Cogdell, and H. Hashimoto,
    Faraday Discuss. 198, 59-71 (2017).
     

  13. Manipulation of single nanodiamonds to ultrathin fiber-taper nanofibers and control of NV-spin states toward fiber-integrated lambda -systems

    M. Fujiwara, K. Yoshida, T. Noda, H. Takashima, A. W. Schell, N. Mizuochi, and S. Takeuchi, Nanotechnology 27, 455202 (2016).
     

  14. Detailed numerical analysis of photon emission from a single light emitter coupled with a nanofiber Bragg cavity
    H. Takashima, M. Fujiwara, A. W. Schell, and S. Takeuchi
    Opt. Express 24, 15050-15058 (2016).
     

  15. Optical tracking of picosecond coherent phonon pulse focusing inside a sub-micron object
    T. Dehoux, K. Ishikawa, P. H. Otsuka, M. Tomoda, O. Matsuda, M. Fujiwara, S. Takeuchi, I. A Veres, V. E. Gusev and O. B. Wright
    Light: Science & Applications (Nature) 5, e16082 (2016).
     

  16. Measuring the charge density of a tapered optical fiber using trapped microparticles
    K. Kamitani, T. Muranaka, H. Takashima, M. Fujiwara, U. Tanaka, S. Takeuchi, and S. Urabe
    Opt. Express 24, 4672-4679 (2016).
     

  17. Ultrathin fiber-taper coupling with nitrogen vacancy centers in nanodiamonds at cryogenic temperatures

    M. Fujiwara, H.-Q. Zhao, T. Noda, K. Ikeda, H. Sumiya, S. Takeuchi

    Opt. Lett. 40, 5702 (2015).
     

  18. Highly Efficient Coupling of Nanolight Emitters to a Ultra-Wide Tunable Nano Fibre Cavity

    A. W. Schell, H. Takashima, S. Kamioka, Y. Oe, M. Fujiwara, O. Benson, S. Takeuchi,

    Sci. Reports 5, 9619 (2015). 
     

  19. Numerical simulations of nanodiamond nitrogen-vacancy centers coupled with tapered optical fibers as hybrid quantum nanophotonic devices

    M. Almokhtar, M. Fujiwara, H. Takashima, and S. Takeuchi, 

    Opt. Express 22, 20045 (2014).
     

  20. Observation of 1.2-GHz linewidth of zero-phonon-line in photoluminescence spectra of nitrogen vacancy centers in nanodiamonds using a Fabry-Perot interferometer

    H.-Quan Zhao, M. Fujiwara, M. Okano, and S. Takeuchi,

    Opt. Express 21, 29679 (2013).

  21. Embedded TiO2 waveguides for sensing nanofluorophores in a microfluidic channel

    M. Furuhashi, M. Fujiwara, T. Ohshiro, K. Matsubara, M. Tsutsui, M. Taniguchi, S. Takeuchi, T.Kawai, 

    Appl. Phys. Lett. 101, 153115 (2012).
     

  22. Effect of Substrates on the Temperature Dependence of Fluorescence Spectra of Nitrogen Vacancy Centers in Diamond Nanocrystals

    H.-Q. Zhao, M. Fujiwara, S. Takeuchi

    Jpn. J. Appl. Phys. 51, 090110 (2012).  
     

  23. Suppression of fluorescence phonon sideband from nitrogen vacancy centers in diamond nanocrystals by substrate effect

    H.-Q. Zhao, M. Fujiwara, S. Takeuchi

    Opt. Express 20, 15628-15635 (2012). 
     

  24. A nanodiamond-tapered fiber system with high single-mode coupling efficiency

    T. Schröder, M. Fujiwara, T. Noda, H.-Q. Zhao, O. Benson, S. Takeuchi

    Opt. Express 20, 10490-10497 (2012). 
     

  25. Coupling of ultrathin tapered fibers with high-Q microsphere resonators at cryogenic temperatures and observation of phase-shift transition from undercoupling to overcoupling

    M. Fujiwara, T. Noda, A. Tanaka, K. Toubaru, H.-Q. Zhao, S. Takeuchi

    Opt. Express 20, 19545-19553 (2012).
     

  26. Development of microfabricated TiO2 channel waveguides

    M. Furuhashi, M. Fujiwara, T. Ohshiro, M. Tsutsui, K. Matsubara, M. Taniguchi, S. Takeuchi, T. Kawai

    AIP Advances 1, 032102 (2011).
     

  27. Highly Efficient Coupling of Photons from Nanoemitters into Single-Mode Optical Fibers

    M. Fujiwara, K. Toubaru, T. Noda, H.-Q Zhao, S. Takeuchi

    Nano Lett. 11, 4362 (2011).
     

  28. Phase shift spectra of a fiber-microsphere system at the single photon level

    A. Tanaka, T. Asai, K. Toubaru, H. Takashima, M. Fujiwara, R. Okamoto, and S. Takeuchi

    Opt. Express 19, 2278-2285 (2011).
     

  29. Optical transmittance degradation in tapered fibers

    M. Fujiwara, K. Toubaru, S. Takeuchi

    Opt. Express 19, 8596-8601 (2011).
     

  30. Fiber-microsphere system at cryogenic temperatures toward cavity QED using diamond NV centers

    H. Takashima, T. Asai, K. Toubaru, M. Fujiwara, K. Sasaki, S. Takeuchi,

    Opt. Express 18, 15169-15173 (2010).

  31. Ultrafast relaxation kinetics of the dark S1 state in all-trans-b-carotene explored by one- and two-photon pump-probe spectroscopy

    D. Kosumi, K. Abe, H. Karasawa, M. Fujiwara, R. J. Cogdell, H. Hashimoto, M. Yoshizawa

    Chem. Phys. 373, 33 (2010). 

  32. Comparison of transient grating signals from spheroidene in an organic solvent and in pigment-protein complexes from Rhodobacter sphaeroides 2.4.1

    M. Sugisaki, M. Fujiwara, D. Kosumi, R. Fujii, M. Nango, R. J. Cogdell, H. Hashimoto,

    Phys. Rev B 81, 245112 (2010).
     

  33. Third-order optical nonlinearity of b-carotene homologues

    M. Fujiwara, K. Yamauchi, M. Sugisaki, K. Yanagi, A. Gall, B. Robert, R. J. Cogdell, H. Hashimoto

    Phys. Stat. Solidi C 6, S31-S33 (2009). 
     

  34. Ultrafast optical responses of b-carotene and lycopene probed by sub-20 fs time-resolved coherent spectroscopy

    M. Fujiwara, M. Sugisaki, A. Gall, B. Robert, R. J. Cogdell, H. Hashimoto

    J. Lumin. 129, 1808-1812 (2009). 

  35. Ultrafast Nonlinear Optical Responses Induced by Multiphoton Excitation in All-trans-b-carotene: Nonresonant Excitation to the Optically Allowed S2 State

    D. Kosumi, M. Fujiwara, H. Hashimoto, M. Yoshizawa

    J. Phys. Soc. Jpn. 78, 104715 (2009).
     

  36. Optimized terahertz-wave generation using BNA-DFG

    K. Miyamoto, S. Ohno, M. Fujiwara, H. Hashimoto, H. Ito

    Opt. Express 17, 14832-14838 (2009). 

  37. Simultaneous reference and differential waveform acquisition in time-resolved terahertz spectroscopy

    K. Iwaszczuk, D. G. Cooke, M. Fujiwara, H. Hashimoto, P. U. Jepsen

    Opt. Express 17, 21969-21976 (2009).

  38. Excitation-energy dependence of transient grating spectroscopy in beta-carotene

    M. Sugisaki, M. Fujiwara, S. V. Nair, H. E. Ruda, R. J. Cogdell, H. Hashimoto

    Phys. Rev. B 80, 035118 (2009).

  39. The dependence of the ultrafast relaxation kinetics of the S2 and S1 states in b-carotene homologs and lycopene on conjugation length studied by femtosecond time-resolved absorption and Kerr-gate fluorescence spectroscopies

    D. Kosumi, M. Fujiwara, R. Fujii, R. J.Cogdell, H. Hashimoto, M. Yoshizawa

    J. Chem. Phys. 130, 214506 (2009).

  40. Third-order optical nonlinearity of beta-carotene homologues

    M. Fujiwara, K. Yamauchi, M. Sugisaki, K. Yanagi, A. Gall, B. Robert, R. J. Cogdell, H. Hashimoto

    Phys. Stat. Solidi C 6, S31-S33 (2009). 

  41. Spectrally-resolved transient grating signals from b-carotene in benzene solution

    M. Sugisaki, M. Fujiwara, S. V. Nair, H. E. Ruda, R. J. Cogdell, H. Hashimoto

    Phys. Stat. Solidi C 6, S34-S37 (2009).

  42. Ultrafast coherent vibronic oscillations in regioregular poly(3-alkylthiophene)

    K. Kanemoto, M. Sugisaki, M. Fujiwara, T. Karasawa, H. Hashimoto

    Phys. Stat. Solidi C 6, S46-S49 (2009).

  43. Transient grating spectroscopy in photosynthetic purple bacteria Rhodobacter sphaeroides 2.4.1

    M. Sugisaki, M. Fujiwara, R. Fujii, K. Nakagawa, M. Nango, R. J. Cogdell, H. Hashimoto

    J. Lumin. 129, 1908-1911 (2009). 
     

  44. Coherent tunable monochromatic THz-wave generation using N-Benzyl-2-methyl-4-nitroaniline (BNA) crystal
    K. Miyamoto, H. Minamide, M. Fujiwara, H. Hashimoto, H.Ito
    Opt. Lett. 33, 252-254 (2008).
     

  45. Four-wave mixing signals from b-carotene and its n = 15 homologue

    M. Sugisaki, M. Fujiwara, K. Yanagi, R. J. Cogdell, H. Hashimoto

    Photosynth. Res. 95, 299-308 (2008).
     

  46. Large Third-Order Optical Nonlinearity Realized in Symmetric Nonpolar Carotenoids
    M. Fujiwara, K. Yamauchi, M. Sugisaki, K. Yanagi, A. Gall, B. Robert, R. J. Cogdell, H. Hashimoto
    Phys. Rev. B 78, 161101(R) (2008).
     

  47. Energy dissipation in the ground-state vibrational manifolds of β-carotene homologues: a sub-20-fs time-resolved transient grating spectroscopic study
    M. Fujiwara, K. Yamauchi, M. Sugisaki, A. Gall, B. Robert, R. J. Cogdell, H. Hashimoto
    Phys. Rev. B 77, 205118 (2008). 
     

  48. Determination of the d-tensor components of a single crystal of N-benzyl 2-methyl-4-nitroaniline
    M. Fujiwara, M. Maruyama, H. Takahashi, S. Aoshima, R. J. Cogdell, H. Hashimoto
    Jpn. J. Appl. Phys. 46, 1528-1530 (2007). 
     

  49. Second order nonlinear optical properties of the single crystal of N-benzyl 2-methyl-4-nitroaniline: anomalous enhancement of the d333 component and its possible origin
    M. Fujiwara, K. Yanagi, M. Maruyama, M. Sugisaki, K. Kuroyanagi, H. Takahashi, S. Aoshima, Y. Tsuchiya, A. Gall, H. Hashimoto
    Jpn. J. Appl. Phys. 45, 8676-8685 (2006). 
     

  50. Determination of the Refractive Indices and Absorption Coefficients of Highly Purified N-Benzyl-2-methyl-4-nitroaniline Crystal in Terahertz Frequency Regime

    K. Kuroyanagi, M. Fujiwara, H. Hashimoto, H. Takahashi, S. Aoshima, Y. Tsuchiya
    Jpn. J. Appl. Phys. 45, L761-L764 (2006). 
     

  51. All Organic THz Electromagnetic Wave Emission and Detection Using Highly Purified N-Benzyl-2-Methyl-4-Nitroaniline Crystals

    K. Kuroyanagi, M. Fujiwara, H. Hashimoto, H. Takahashi, S. Aoshima, Y. Tsuchiya
    Jpn. J. Appl. Phys. 45, 4068-4073 (2006).

Masazumi Fujiwara

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