Publications
  1. Diamond quantum thermometry: From foundations to applications
    Masazumi Fujiwara and Yutaka Shikano
    arXiv:2103.17137. Link

    --------Papers below were published before the group launch on Apr. 01, 2021.--------
     

  2. Wide-field fluorescent nanodiamond spin measurements toward real-time large-area intracellular thermometry 
    Yushi Nishimura, Keisuke Oshimi, Yumi Umehara, Yuka Kumon, Kazu Miyaji, Hiroshi Yukawa, Yutaka Shikano, Tsutomu Matsubara, Masazumi Fujiwara, Yoshinobu Baba, and Yoshio Teki, 
    Sci. Rep. 11, 4248 (2021). Link

     

  3. Real-time estimation of the optically detected magnetic resonance shift in diamond quantum thermometry toward biological applications
    Masazumi Fujiwara, Alexander Dohms, Ken Suto, Yushi Nishimura, Keisuke Oshimi, Yoshio Teki, Kai Cai, Oliver Benson,
    and Yutaka Shikano, 
    Phys. Rev. Research 2, 043415 (2020). Link

     

  4. 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,
    Sci. Adv.  6, eaba9636 (2020). Link

     

  5. Photoprotective mechanisms in the core LH1 antenna pigment-protein complex from the purple photosynthetic bacterium, Rhodospirillum rubrum
    Chiasa Uragami, Hiroki Sato, Nao Yukihira, Masazumi Fujiwara, Daisuke Kosumi, Alastair T. Gardiner, Richard J. Cogdell, and Hideki Hashimoto
    J. Photochem. Photobiol. A 400, 112628 (2020). Link

     

  6. Operando time-resolved diffuse reflection spectroscopy: The origins of photocatalytic water-oxidation activity of bismuth vanadate
    Ryo Miyasato, Masazumi Fujiwara, Chiasa Uragami, Haruyuki Sato, Toshihiro Yano, and Hideki Hashimoto
    J. Photochem. Photobiol. A 395, 112493 (2020). 
    Link
     

  7. 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. 2, 1859-1868 (2020). Link

     

  8. 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). Link

     

  9. 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).Link

     

  10. 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). Link

     

  11. 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). Link

     

  12. 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). Link

     

  13. 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). Link

     

  14. 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). Link

     

  15. 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). Link

     

  16. 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). Link

     

  17. 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). Link

     

  18. 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). Link

     

  19. 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). Link

     

  20. 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). Link

     

  21. 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). Link

     

  22. 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). Link

     

  23. 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). Link

     

  24. 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). Link

     

  25. 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). Link  

     

  26. 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). Link 

     

  27. 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). Link 

     

  28. 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). Link

     

  29. 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). Link

     

  30. 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). Link

     

  31. 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). Link

     

  32. Optical transmittance degradation in tapered fibers
    M. Fujiwara, K. Toubaru, S. Takeuchi
    Opt. Express 19, 8596-8601 (2011). Link

     

  33. 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). Link

     

  34. 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). Link 

     

  35. 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). Link

     

  36. 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). Link 

     

  37. 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). Link 

     

  38. 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). Link

     

  39. Optimized terahertz-wave generation using BNA-DFG
    K. Miyamoto, S. Ohno, M. Fujiwara, H. Hashimoto, H. Ito
    Opt. Express 17, 14832-14838 (2009). Link 

     

  40. 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). Link

     

  41. 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). Link

     

  42. 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). Link

     

  43. 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). Link 

     

  44. 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). Link

     

  45. 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). Link

     

  46. 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). Link 

     

  47. Widely tunable terahertz-wave generation using an N-benzyl-2-methyl-4-nitroaniline crystal
    K. Miyamoto, H. Minamide, M. Fujiwara, H. Hashimoto, H.Ito
    Opt. Lett. 33, 252-254 (2008). Link
     
     

  48. 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). Link

     

  49. 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). Link

     

  50. 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). Link

     

  51. 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). Link 

     

  52. 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). Link 

     

  53. 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). Link 

     

  54. 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). Link