Papers


2020 2019 2018 2017 2016 20152014 2013 2012 2011 2010 2009 2008 2007 2006 20052004
   

2020


Dolf Timmerman, Brandon Mitchell, Shuhei Ichikawa, Masaya Nagai, Masaaki Ashida, and Yasufumi Fujiwara,
Carrier dynamics and excitation of Eu3+ ions in GaN,
Phys. Rev. B 101, 245306(1-5) (2020),
DOI:

Y. Minowa, S. Kuramoto, T. Kameyama, T. Torimoto, M. Ashida,
Synthesis of submicron-sized CdS particles using reverse micelles,
J. of Nanophotonics, 14(2), 026013 (2020.5),
DOI:10.1117/1.JNP.14.026013.

2019


M. Ichimiya, T. Kameyama, T. Torimoto, T. Uematsu, S. Kuwabata, M. Ashida,
Temperature dependences of photoluminescence intensities observed from AgInGaS and AgInGaS/GaSx core–shell nanoparticles,
J. of Nanophotonics, 14, 016010(1-8) (2020.3),
DOI:10.1117/1.JNP.14.016010.

K. Kawase, M. Nagai, K. Furukawa, M. Fujimoto, R. Kato, Y. Honda, and G. Isoyama,
Extremely high-intensity operation of a THz free-electron laser using an electron beam with a higher bunch charge,
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, in press,(2020.2),
DOI: 10.1016/j.nima.2020.163582.

D. Timmerman, B. Mitchell, S. Ichikawa, J. Tatebayashi, M. Ashida, and Y. Fujiwara,
Excitation Efficiency and Limitations of the Luminescence of Eu3+ Ions in GaN,
Phys. Rev. Appl. 13, 014044(1-6) (2020.1),
DOI: 10.1103/PhysRevApplied.13.014044.

M Nagai, A Nakane, H. Suzukawa, T. Morimoto, and M. Ashida,
Time-Domain Magnetic Field-Difference Spectroscopy for Semiconductors Using Circularly Polarized Terahertz Pulses,
IEEE Transactions on Terahertz Science and Technology,in press 10, (1), 51-57 (2020.1).
DOI: 10.1109/TTHZ.2019.2951055.

T. Matsuda, M. Ichimiya, M. Ashida, H. Ishihara,
Ultrafast thermal-free photoluminescence of coherently extended single quantum states,
Scientific Reports 9(1) (2019.11),
DOI: 10.1038/s41598-019-44940-7.

W. Zhang, A. Charous, M.Nagai,  D M. Mittelman, and R Mendis,
Characteristics of resonance-induced optical vortices and spatial reshaping,
Optics Letters, 44, (23), 5800-5803 (2019),
DOI: 10.1364/OL.44.005800 https://doi.org/10.1364/OL.44.005800.

M. Nagai,
Birefringent Metamaterials for THz Optics,
Electromagnetic Metamaterials, pp.89-98(2019.7)
DOI: 10.1007/978-981-13-8649-7_6.

T. Morimoto, M. Nagai, Y. Minowa, M. Ashida, Y. Yokotani, Y. Okuyama & Y. Kani ,
Microscopic ion migration in solid electrolytes revealed by terahertz time-domain spectroscopy,
Nature Communications 10, 2662 (2019.6) ,
DOI:10.1038/s41467-019-10501-9.

T. Kinoshita, T. Matsuda, T. Takahashi, M. Ichimiya, M. Ashida, Y. Furukawa, M. Nakayama, and H. Ishihara,
Synergetic Enhancement of Light-Matter Interaction by Nonlocality and Band Degeneracy in ZnO Thin Films,
Physical Review Letters. 122, 157401(1-5) (2019.4),
DOI:10.1103/PhysRevLett.122.157401.

Takashige Omatsu, Masaaki Ashida, Yoshihiko Arita,
Special Section Guest Editorial: Optical Manipulation and Structured Materials,
Journal of Nanophotonics, 13(1), 012501 (2019.2),
DOI:10.1117/1.JNP.13.012501.

Masataka Kobayashi, Yusuke Arashida, Genki Yamashita, Eiichi Matsubara, Masaaki Ashida, Jeremy A. Johnson, and Ikufumi Katayama ,
Fast-frame single-shot pump-probe spectroscopy with chirped-fiber Bragg gratings,
Optics Letters Vol. 44,Issue 1(2019),
DOI: 10.1364/OL.44.000163.

2018


  • Wei Zhang, Aaron Charous, Masaya Nagai, Daniel M. Mittleman, and Rajind Mendis,
    Characterizing optical resonances using spatial mode reshaping,
    Optica 5, (11) 1414-1417 (2018.11),
    DOI: 10.1364/OPTICA.5.001414

    Wei Zhang, Aaron Charous, Masaya Nagai, Daniel M. Mittleman, and Rajind Mendis,
    Extraordinary optical reflection resonances and bound states in the continuum from a periodic array of thin metal plates,
    Optics Express 26, (10),13195-13204 (2018),
    DOI:10.1364/OE.26.013195.

    Masaya Nagai, Takuya Tomioka, Masaaki Ashida, Mizuki Hoyano, Ryo Akashi,
    Yasuhiro Yamada, Tomoko Aharen, and Yoshihiko Kanemitsu,
    Longitudinal Optical Phonons Modified by Organic Molecular Cation Motions in Organic-Inorganic Hybrid Perovskites,
    Phys. Rev. Lett. 121, 145506 (2018.10),
    DOI: 10.1103/PhysRevLett.121.145506.

    C. de Weerd, L. Gomez, A. Capretti, D. M. Lebrun, E. Matsubara, J.Lin, M. Ashida, F. C. M. Spoor, L. D. A. Siebbeles, A. J. Houtepen, K. Suenaga, Y. Fujiwara,and T. Gregorkiewicz,
    Efficient carrier multiplication in CsPbI3 perovskite nanocrystals,
    Nature Communications 9, 4199 (2018)
    DOI: 10.1038/s41467-018-06721-0.

    Keita Miyagawa, Masaya Nagai, Genki Yamashita, Masaaki Ashida, Changsu Kim, Hidefumi Akiyama, and Yoshihiko Kanemitsu,
    Quantitative monitoring of the internal field in the depletion layer of a GaAs-based solar cell with terahertz radiation,
    Applied Physics Letters, 113, 163501 (2018.10),
    DOI: 10.1063/1.5037952.

2017


  • Tomohiro Inaba, Takanori Kojima, Genki Yamashita, Eiichi Matsubara, Brandon Mitchell, Reina Miyagawa, Osamu Eryu, Jun Tatebayashi, Masaaki Ashida and Yasufumi Fujiwara,
    Quantitative study of energy-transfer mechanism in Eu,O-codoped GaN by time-resolved photoluminescence spectroscopy,
    J. Appl. Phys. 123, 161419 (2018).
    Doi: 10.1063/1.5011283

    Rajind Mendis, Masaya Nagai, Wei Zhang and Daniel M. Mittleman
    Artificial dielectric polarizing-beamsplitter and isolator for the terahertz region,
    Scientific Reports, 7,5909 (2017.7).
    Doi:10.1038/s41598-017-06297-7

    Yosuke Minowa, Yusuke Toyota, and Masaaki Ashida,
    In situ tuning of whispering gallery modes of levitated silica microspheres,
    Journal of the Optical Society of America B, Vol. 34, 6,C20-C24  (2017/5/9).
    Doi:10.1364/JOSAB.34.000C20

    M. Nagai, S. Aono, M. Ashida, K. Kawase, A. Irizawa and G. Isoyama,
    Luminescence induced by electrons outside zinc oxide nanoparticles driven by intense terahertz pulse trains,
    New Journal of Physics, 19, 053017 (2017.5)
    Doi:10.1088/1367-2630/aa6e19

    Yosuke Minowa, Yuya Oguni, and Masaaki Ashida,
    Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium,
    Optics Express, 25, 10449-10455 (2017.4).
    Doi:10.1364/OE.25.010449

2016


  • G. Yamashita, E. Matsubara, M. Nagai, C. Kim, H. Akiyama, Y. Kanemitsu, and M. Ashida,
    Sensitive monitoring of photocarrier densities in the active layer of a photovoltaic device with time-resolved terahertz reflection spectroscopy,
    Applied Physiscs Letters 110, 071108 (2017.2) .
    doi: 10.1063/1.4975631

  • Y. Sakasegawa, S. Saito, N. Sekine, A. Kasamatsu, M. Ashida, and Iwao Hosako,
    Time-resolved intensity and spectral changes in a wide-ridge terahertz quantum cascade laser by optical pulse injection,
    Jpn. J. Appl. Phys. 55, 102701 (2016) .
    DOI: 10.7567/JJAP.55.102701

  • E. Matsubara, T. Mochizuki, M. Nagai, and M. Ashida,
    Self-polarized terahertz magnon absorption in a single crystal of BiFeO3,
    Phys. Rev. B94, 054426 (2016.8).
    DOI:10.1103/PhysRevB.94.054426

  • L. Q. Phuong, Y. Yamada, M. Nagai, N. Maruyama, A. Wakamiya, and Y. Kanemitsu,
    Free Carriers versus Excitons in CH3NH3PbI3 Perovskite Thin Films at Low Temperatures: Charge Transfer from the Orthorhombic Phase to the Tetragonal Phase,
    The Journal of Physical Chemistry Letters 7, 2316–2321 (2016.6).
    DOI:10.1021/acs.jpclett.6b00781

  • H. Hoshina, H. Suzuki, C. Otani, M. Nagai, K. Kawase, A. Irizawa, G. Isoyama,
    Polymer Morphological Change Induced by Terahertz Irradiation,
    Scientific Reports 6, 27180 (2016.6).
    doi:10.1038/srep27180

  • S. Fukushima, T. Furukawa, H. Niioka, M. Ichimiya, T. Sannomiya, N. Tanaka, D. Onoshima, H. Yukawa, Y. Baba, M. Ashida, J. Miyake, T. Araki and M. Hashimoto,
    Correlative near-infrared light and cathodoluminescence microscopy using Y2O3:Ln, Yb (Ln = Tm, Er) nanophosphors for multiscale, multicolour bioimaging ,
    Scientific Reports 6, 25950 (2016.5).
    doi:10.1038/srep25950

  • Toru Adachi, Yusuke Nakamatsu, Tatsuya Kobayashi, Shigeki Miyasaka, Setsuko Tajima, Masayoshi Ichimiya, Masaaki Ashida, Hajime Sagayama, Hironori Nakao, Reiji Kumai, and Youichi Murakami,
    Effects of c/a Anisotropy and Local Crystal Structure on Superconductivity in AFe2(As1−xPx)2 (A = Ba1−ySry, Sr1−yCay and Eu),
    J. Phys. Soc. Jpn. 85, 063705(1-4) (2016.5) LETTERS .
    doi:10.7566/JPSJ.85.063705

  • Elinore M. L. D. de Jong,Genki Yamashita, Leyre Gomez, Masaaki Ashida, Yasufumi Fujiwara, and Tom Gregorkiewicz, 
    Multiexciton Lifetime in All-Inorganic CsPbBr3 Perovskite Nanocrystals ,
    The Journal of Physical Chemistry C 121, 1941-1947 (2017) (2016.12).
    doi:10.1021/acs.jpcc.6b10551


2015


  • T. V. A. Nguyen, A. N. Hattori, M. Nagai, T. Nakamura, M. Ashida and H. Tanaka,
    Electrical transport properties of (La,Pr,Ca)MnO3 nanowires investigated using terahertz time domain spectroscopy,
    J. Appl. Phys. 119, 125102 (2016.3).
    doi:10.1063/1.4944601

  • R. Mendis, M. Nagai, Y. Wang, N. Karl, and D. M. Mittleman,
    Terahertz Artificial Dielectric Lens,
    Scientific Reports 6, 23023 (2016.3).
    doi:10.1038/srep23023

  • A. Ishikawa, K. Miyajima, M. Ashida, T. Itoh, and H. Ishihara ,
    Theory of Superfluorescence in Highly Inhomogeneous Quantum Systems,
    J. Phys. Soc. Jpn. 85, 034703 (2016.3).

  • S. Fukushima, T. Furukawa, H. Niioka, M. Ichimiya, T. Sannomiya, J. Miyake, M. Ashida, T. Araki, and M. Hashimoto,
    Synthesis of Y2O3 nanophosphors by homogeneous precipitation method using excessive urea for cathodoluminescence and upconversion luminescence bioimaging,
    Optical Materials Express, 6, 831-843 (2016.2).
    DOI: 10.1364/OME.6.000831

  • T. Morimoto, G. Yamashita, M. Nagai and M. Ashida,
    Evaluation of complex conductivity in a circularly polarized field by terahertz time-domain reflection spectroscopy with a phase shifter,
    Appl. Phys. Express. 9(2), 022402 (2016.2).
    DOI: 10.7567/APEX.9.022402

  • T. Suzuki, M. Nagai, and Y. Kishi,
    Extreme-sensitivity terahertz polarizer inspired by an anisotropic cut-through metamaterial,
    Opt. Lett. 41(2), 325-328 (2016.1).
    DOI: 10.1364/OL.41.000325

  • L. Q. Phuong, M. Okano, G. Yamashita, M. Nagai, M. Ashida, A. Nagaoka, K. Yoshino and Y. Kanemitsu,
    Free-carrier dynamics and band tails in Cu2ZnSn(SxSe1-x)4: Evaluation of factors determining solar cell efficiency,
    Phys. Rev. B 92, 115204 (2015.9).
    DOI: 10.1103/PhysRevB.92.115204

  • E. Matsubara, T. Mochizuki, M. Nagai, T. Ito and M. Ashida,
    Ultrafast near-infrared nonlinear absorption in a multiferroic single crystal of bismuth ferrite,
    Jpn. J. Appl. Phys. 54, 092201(1)-(5) (2015.8).
    DOI: 10.7567/JJAP.54.092201

  • A. N. Hattori, Y. Fujiwara, K. Fujiwara, T. V. A. Nguyen, T. Nakamura, M. Ichimiya, M. Ashida and H. Tanaka,
    Identification of Giant Mott Phase Transition of Single Electric Nanodomain in Manganite Nanowall Wire,
    Nano Lett. 15 (7) 4322-4328 (2015.06).
    DOI: 10.1021/acs.nanolett.5b00264

  • H. Fujiwara, T. Kiss, Y. K. Wakabayashi, Y. Nishitani, T. Mori, Y. Nakata, S. Kitayama, K. Fukushima, S. Ikeda, H. Fuchimoto, Y. Minowa, S. K. Mo, J. D. Denlinger, J. W. Allen, P. Metcalf, M. Imai, K. Yoshimura, S. Suga, T. Muro and A. Sekiyama,
    Soft X-ray angle-resolved photoemission with micro-positioning techniques for metallic V2O3,
    J. Synchrotron Rad. 22, 776-78 (2015.05).
    DOI: 10.1107/S1600577515003707

  • L. Q. Phuong, M. Okano, G. Yamashita, M. Nagai, M. Ashida, A. Nagaoka, K. Yoshino and Y. Kanemitsu,
    Photocarrier dynamics in undoped and Na-doped Cu2ZnSnS4 single crystals revealed by ultrafast time-resolved terahertz spectroscopy,
    Appl. Phys. Express, 8 (6) 062303 (1-4) (2015.05).
    DOI: 10.7567/APEX.8.062303

2014


  • Y. Minowa, R. Kawai and M. Ashida,
    Optical levitation of a microdroplet containing a single quantum dot,
    Optics Lett. 40, (6) 906-909 (2015.03).
    DOI: 10.1364/OL.40.000906

  • M. Nagai, Y. Kamon, E. Matsubara, Y. Minowa and M. Ashida,
    Pulse shaping of the intense few-cycle terahertz pulses for nonlinear spectroscopy,
    Ultrafast Phenomena and Nanophotonics XIX, Proceedings of SPIE - The International Society for Optical Engineering Volume 9361, 936107 (1-6) (2015.03).
    DOI: 10.1117/12.2079005

  • M. Ichimiya, T. Umakoshi, H. Murata, T. Kinoshita, H. Ishihara and M. Ashida,
    Resonant Optical Kerr Response with Ultrashort Decay Time by Nonlocal Wave Coupling of Light and Excitons,
    Ultrafast Phenomena XIX, Proceedings of the 19th International Conference, (Springer), (2015.02).
    DOI: 10.1364/UP.2014.08.Tue.P2.47


  • M. Nagai, N. Mukai, Y. Minowa, M. Ashida, T. Suzuki, J. Takayanagi and H. Ohtake,
    Achromatic wave plate in THz frequency region based on parallel metal plate waveguides with a pillar array,
    Optics Express, 23, (4) 4641–4649 (2015.02).
    DOI: 10.1364/OE.23.004641


  • Y. Kishi, M. Nagai, J. C. Young, K. Takano, M. Hangyo and T. Suzuki,
    Terahertz laminated-structure polarizer with high extinction ratio and transmission power,
    Appl. Phys. Express, 8, (3) 032201 (1-4) (2015.02)
    DOI: 10.7567/APEX.8.032201


  • S. Okamoto, S. Ichikawa, Y. Minowa and M. Ashida,
    Fabrication and Lasing Properties of Single-Crystalline Semiconductor Microspheres with Anisotropic Crystal Structures,
    MRS Online Proceedings Library, 1736, mrsf14-1736-t08-02 (1-6) (2015.02).
    DOI:10.1557/opl.2015.103


  • G. Yamashita, E. Matsubara, M. Nagai, Y. Kanemitsu and M. Ashida,
    Intrinsic carrier multiplication efficiency in bulk Si crystals evaluated by optical-pump/terahertz-probe spectroscopy,
    Appl. Phys. Lett. 105, 231118 (1-4) (2014.12).
    DOI: 10.1063/1.4903859


  • L. Q. Phuong, M. Okano, Y. Yamada, G. Yamashita, T. Morimoto, M. Nagai, M. Ashida, A. Nagaoka, K. Yoshino and Y. Kanemitsu,
    Ultrafast free-carrier dynamics in Cu2ZnSnS4 single crystals studied using femtosecond time-resolved optical spectroscopy,
    Appl. Phys. Lett. 105, 231902 (1-4) (2014.12).
    DOI: 10.1063/1.4903802

  • Y. Minowa and M. Ashida,
    Optical Transportation of Semiconductor Nanoparticles,
    The Review of Laser Engineering, 42, (10) 771-775 (2014.10).


  • T. V. A. Nguyen, A. N. Hattori, M. Nagai, T. Nakamura, K. Fujiwara, M. Ashida and H. Tanaka,
    Estimation of dc transport dynamics in strongly correlated (La,Pr,Ca)MnO3 film using an insulator-metal composite model for terahertz conductivity,
    Appl. Phys. Lett. 105, 023502 (1-4) (2014.07).
    DOI: 10.1063/1.4890109

  • S. Fukushima, T. Furukawa, H. Niioka, M. Ichimiya, J. Miyake, M. Ashida, T. Araki and M. Hashimoto,
    Y2O3:Tm,Yb nanophosphors for correlative upconversion luminescence and cathodoluminescence imaging,
    Micron, 67, 90-95 (2014.07).
    DOI: 10.1016/j.micron.2014.07.002

  • M. Nagai, E. Matsubara, M. Ashida, J. Takayanagi and H. Ohtake,
    Generation and Detection of THz Pulses with a Bandwidth Extending Beyond 4 THz Using a Sub-picosecond Yb-doped Fiber Laser System,
    Terahertz Science and Technology, IEEE Transactions on, 4, (4) 440-446 (2014.07).
    DOI:10.1109/TTHZ.2014.2327377

  • R. Kakimi, M. Fujita, M. Nagai, M. Ashida and T. Nagatsuma,
    Capture of a terahertz wave in a photonic-crystal slab,
    Nature Photonics, 8, (8) 657-663 (2014.07).
    DOI: 10.1038/nphoton.2014.150

  • S. Okamoto, K. Inaba, T. Iida, H. Ishihara, S. Ichikawa and M. Ashida,
    Fabrication of single-crystalline microspheres with high sphericity from anisotropic materials,
    Sci. Rep. 4, 5186 (1-4) (2014.06).
    DOI: 10.1038/srep05186

2013


  • M. Ashida, E. Matsubara and I. Katayama,
    Ultra-broadband IR and THz generation and detection with ultrashort pulses,
    Proceedings of SPIE - The International Society for Optical Engineering, 8964, (2014.02).
    DOI: 10.1117/12.2042829


  • T. Kawano, I. Katayama, J. Ohara, M. Ashida and J. Takeda,
    Intermolecular THz Vibrations Relevant to Optically and Thermally Induced Magnetic Phase Transitions in the Strongly Correlated Organic Radical TTTA,
    J. Phys. Soc. Jpn. 83, 014713 (1-6) (2014.01).
    DOI: 10.7566/JPSJ.83.014713


  • M. Nagai, N. Mukai, Y. Minowa, M. Ashida, J. Takayanagi and H. Ohtake,
    Achromatic THz wave plate composed of stacked parallel metal plates,
    Opt. Lett. 39, (1) 146-149 (2014.01).
    DOI: 10.1364/OL.39.000146


  • S. Okamoto, S. Ichikawa, Y. Minowa and M. Ashida,
    Optical fabrication of semiconductor single-crystalline microspheres in superfluid helium,
    MRS Proceedings, 1635, 104270 (2013.12).
    DOI: 10.1557/opl.2014.100


  • T. Furukawa, H. Niioka, M. Ichimiya, T. Nagata, M. Ashida, T. Araki and M. Hashimoto,
    High-resolution microscopy for biological specimens via cathodoluminescence of Eu- and Zn-doped Y2O3nanophosphors,
    Optics Express, 21, (22) 25655-25663 (2013.11).
    DOI: 10.1364/OE.21.025655.


  • M. Ichimiya, L. Q. Phuong, M. Ashida and T. Itoh,
    Growth of high-quality CuCl thin films by a technique involving electron-beam irradiation,
    J. Cryst. Growth, 378, 372-375 (2013.09).
    DOI: 10.1016/j.jcrysgro.2012.12.103


  • M. Ichimiya, M. Ashida and H. Ishihara,
    Extreme Optical Responses by Precise Control in Thin Film Fabrication ofⅠ -VII Compounds,
    Journal of smart processing, 2, (5) 245-250 (2013.09).


  • I. Katayama, R. Akai, M. Bito, E. Matsubara and M. Ashida,
    Electric field detection of phase-locked near-infrared pulses using photoconductive antenna,
    Optics Express, 21, (14) 16248-16254 (2013.06).
    DOI: 10.1364/OE.21.016248


  • E. Matsubara, M. Nagai and M. Ashida,
    Coherent infrared spectroscopy system from terahertz to near infrared using air plasma produced by 10-fs pulses,
    J. Opt. Soc. Am. B, 30, 1627-1630 (2013.06).
    DOI: 10.1364/JOSAB.30.001627


  • M. Nagai, Y. Kamon, Y. Minowa, E. Matsubara and M. Ashida,
    Coherent transitions between the shallow acceptor levels in germanium using intense THz pulses,
    New J. Phys. 15, 065012-065021 (2013.06).
    DOI: 10.1088/1367-2630/15/6/065012


2012


  • L.Q. Phuong, K. Miyajima, K. Maeno, T. Itoh and M. Ashida,
    Transitions from spontaneous emission to stimulated emission and superfluorescence of biexcitons confined in CuCl quantum dots,
    J. Luminescence, 133, 77-80 (2013.01).
    DOI: 10.1016/j.jlumin.2011.10.001


  • L. Q. Phuong, M. Ichimiya, H. Ishihara and M. Ashida,
    Multiple light-coupling modes of confined excitons observable in photoluminescence spectra of high-quality CuCl thin films,
    Phys. Rev. B, 86, 235449 (1-5) (2012.12).
    DOI: 10.1103/PhysRevB.86.235449


  • A. N. Hattori, M. Ichimiya, M. Ashida and H. Tanaka,
    ZnO nanobox luminescent source fabricated by three-dimensional nanotemplate pulsed-laser deposition,
    Appl. Phys. Express, 5, 125203 (1-3) (2012.11).
    Reported on "Nature Photonics 7, 92 (2013)",
    DOI: 10.1143/APEX.5.125203


  • M. Ando, S. Uozumi, I. Katayama, M. Ichimiya, M. Ashida and J. Takeda,
    Photoluminescence dynamics in CuCl thin films under high-dense one-and two-photon excitations,
    Phys. Status Solidi C, 9, (12) 2493-2496 (2012.10).
    DOI: 10.1002/pssc.201200278


  • M. Ichimiya, H. Yasuda, M. Ashida, H. Ishihara and T. Itoh,
    Room temperature superradiance due to coherent coupling between light and extended single quantum state,
    J. Non-Cryst. Solids, 358, 2357-2361 (2012.09).
    DOI: 10.1016/j.jnoncrysol.2012.02.019


  • M. Tsubouchi, M. Nagai and Y. Ohshima,
    Terahertz tomography of a photo-induced carrier based on pump-probe spectroscopy using counterpropagation geometry,
    Opt. Lett. 37, (17) 3528-3530 (2012.09).
    DOI: 10.1364/OL.37.003528.


  • E. Matsubara, M. Nagai and M. Ashida,
    Generation and detection of ultrabroadband infrared wave exceeding 200 THz,
    18th International Conference on Ultrafast Phenomena, UP 2012(2012.07).
    DOI: 10.1051/epjconf/20134109001


  • K. Katayama, K. Miyajima, M. Ashida and T. Itoh,
    The photoexcited spin-aligned state of high-density exciton magnetic polarons and the effect of magnetic field in semimagnetic semiconductor Cd 0.8Mn 0.2Te,
    J. Phys. Condens. Matter, 24, (32) 5801(1-6) (2012.08).
    DOI: 10.1088/0953-8984/24/32/325801


  • E. Matsubara, M. Nagai and M. Ashida,
    Ultrabroadband coherent electric field from far infrared to 200 THz using air plasma induced by 10 fs pulses,
    Appl. Phys. Lett. 101, 011105 (1-4) (2012.07).
    DOI: 10.1063/1.4732524


2011


  • M. Nagai, E. Matsubara, and M. Ashida,
    High-efficiency terahertz pulse generation via optical rectification by suppressing stimulated Raman scattering process,
    Optics Express, 20, (6) 6509-6514 (2012.03).
    DOI: 10.1364/OE.20.006509


  • I. Katayama, H. Shimosato, M. Bito, K. Furusawa, M. Adachi, M. Shimada, H. Zen, S. Kimura, N. Yamamoto, M. Hosaka, M. Katoh and M. Ashida,
    Electric field detection of coherent synchrotron radiation in a storage ring generated using laser bunch slicing,
    Appl. Phys. Lett. 100, 111112 (1-4) (2012.03).
    DOI: 10.1063/1.3694049


  • I. Katayama, H. Aoki, J. Takeda, H. Shimosato, M. Ashida, R. Kinjo, I. Kawayama, M. Tonouchi, M. Nagai and K. Tanaka,
    Ferroelectric soft mode in a SrTiO3 thin film impulsively driven to the anharmonic regime using intense picosecond Terahertz pulses,
    Phys. Rev. Lett. 108, 097401 (1-5) (2012.02).
    DOI: 10.1103/PhysRevLett.108.097401


  • S. Okamoto, Y. Minowa and M. Ashida,
    White-light lasing in ZnO microspheres fabricated by laser ablation,
    Proc. of SPIE, 8263 82630K(1-7), (2012.02).
    DOI: 10.1117/12.907595


  • M. Nagai, H. Hirori and K. Tanaka,
    New Materials Properties Induced by Intense THz Electromagnetic Pulse,
    The Nihon Butsuri Gakkaishi, 66, (12) 919-922, (2011.12)

  • Y. Minowa, M. Nagai, H. Tao, K. Fan, A. C. Strikwerda, X. Zhang, R. D. Averitt and K. Tanaka,
    Extremely thin metamaterial as slab waveguide at terahertz frequencies,
    IEEE Transactions on Terahertz Science and Technology, 1, (2) 441-449 (2011.12).
    DOI: 10.1109/TTHZ.2011.2167832


  • H. Niioka, T. Furukawa, M. Ichimiya, M. Ashida, T. Araki and M. Hashimoto,
    Multicolor Cathodoluminescence Microscopy for Biological Imaging with Nanophosphors,
    Appl. Phys. Express, 4, (11) 112402 (1-3) (2011.11).

    Accepted by "Virtual Journal of Nanoscale Science & Technology, 24, (22) (2011)"
    DOI: 10.1143/APEX.4.112402

  • K. Tanaka, H. Hirori and M. Nagai,
    THz Nonlinear Spectroscopy of Solids,
    IEEE Transactions on Terahertz Science and Technology, 1, (1) 60, 301-312 (2011.09).
    DOI: 10.1109/TTHZ.2011.2159535


  • E. Abraham, Y. Ohgi, M. Minami, M. Jewariya, M. Nagai, T. Araki and T. Yasui,
    Real-time line projection for fast terahertz spectral computed tomography,
    Opt. Lett. 36, (11) 2119-2121 (2011.06).
    DOI: 10.1364/OL.36.002119


  • H. A. Nguyen, K. Miyajima, T. Itoh, T.C. Dao, T.A. Cao, T.Q.N. Luong and M. Ashida,
    The effect of the etching process on the morphology and photoluminescence of porous amorphous SiC,
    Advances in Natural Sciences: Nanoscience and Nanotechnology, 2, (2) 025009(1-5) (2011.06).
    DOI: 10.1088/2043-6262/2/2/025009

2010


  • M. Ichimiya, K. Mochizuki, M. Ashida, H. Yasuda, H. Ishihara and T. Itoh,
    Efficient radiative recombination of multinode-type excitons up to room temperature in CuCl thin films,
    J. Luminescence, 131, 498-501 (2011.03).
    DOI: 10.1016/j.jlumin.2010.09.009


  • M. Ichimiya, K. Mochizuki, M. Ashida, H. Yasuda, H. Ishihara and T. Itoh,
    Room temperature degenerate four-wave mixing in CuCl thin films,
    Phys. Status Solidi B, 248, 456-459 (2011.02).
    DOI: 10.1002/pssb.201000813


  • K. Miyajima, K. Maeno, S. Saito, M. Ashida and T. Itoh,
    Biexcitonic superfluorescence from CuCl quantum dots under resonant two-photon excitation,
    Phys. Status Solidi C, 8, (1) 209-212 (2011.01).
    DOI: 10.1002/pssc.201000668


  • I. Katayama, R. Akai, M. Bito, H. Shimosato, K. Miyamoto, H. Ito and M. Ashida,
    Ultrabroadband terahertz generation using 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium tosylate single crystals,
    Appl. Phys. Lett. 97, 021105-021107 (2010.07).

    Accepted by "Virtual Journal of Ultrafast Science, 9, (8) (2010)"
    DOI: 10.1063/1.3463452


  • M. Ashida, M. Ichimiya, K. Mochizuki, H. Yasuda, H. Ishihara and T. Itoh,
    Coherent Nonlinear Response Surviving at Room Temperature Caused by Ultrafast Radiative Decay of Confined Excitons,
    Ultrafast Phenomena XVII, Proceedings of the 17th International Conference, (Oxford University Press), (2010.07).
    DOI: 10.1364/UP.2010.ThE43


  • I. Katayama and M. Ashida,
    Broadband terahertz spectroscopy and its application to the characterization of thin films,
    Journal of the Vacuum Society of Japan, 53, (5) 301-308, (2010.06)
    DOI: 10.3131/jvsj2.53.301


2009


  • M. Ichimiya, M. Ashida, H. Yasuda, H. Ishihara and T. Itoh,
    Observation of Superradiance by Nonlocal Wave Coupling of Light and Excitons in CuCl Thin Films,
    Phys. Rev. Lett. 103, 257401, (2009.12).
    DOI: 10.1103/PhysRevLett.103.257401

    Accepted by "Virtual Journal of Ultrafast Science, 9, 1 (2010)"
    Reported on "Laser Focus World Japan, January 2010", World News


  • K. Miyajima, S. Saito, M. Ashida and T. Itoh,
    Superfluorescent pulsed emission from biexcitons in an ensemble of CuCl quantum dots,
    Materials Research Society Symposium Proceedings, 1208, 2010, 154-159, (2009.11).
    DOI: 10.1557/PROC-1208-O09-21


  • M. Ashida, R. Akai, H. Shimosato, I. Katayama, K. Miyamoto, and H. Ito,
    Electric Field Detection of Near-Infrared Light Using Photoconductive Sampling,
    Ultrafast Phenomena XVI (Springer Series in Chemical Physics), 92, 979-981 (2009.07).
    DOI: 10.1007/978-3-540-95946-5_317


  • K. Miyajima, Y. Kagotani, S. Saito, M. Ashida and T. Itoh,
    Superfluorescent pulsed emission from biexcitons in an ensemble of semiconductor quantum dots,
    J. Phys. Condens. Matter, 21, (19) 195802 (1-6) (2009.05).
    DOI: 10.1088/0953-8984/21/19/195802

2008

  • K. Miyajima, Y. Umemura, K. Katayama, M. Ashida and T. Itoh,
    Magnetic-field induced mixing of singlet and triplet excitons confined in CuCl quantum dots,
    Phys. Status Solidi C, 6, (1) 53-56 (2009.01).
    DOI: 10.1002/pssc.200879872


  • K. Inaba, T. Saito,Y. Saito, M. Ichimiya, M. Ashida, S. Ichikawa, S. Takeda and T. Itoh,
    Optical fabrication of wide-gap semiconductor nanoparticles in seperfluid helium,
    Phys. Status Solidi C, 6, (1) 217-220 (2009.01).
    DOI: 10.1002/pssc.200879831


  • K. Katayama, K. Miyajima, M. Ashida and T. Itoh,
    Polarization memory effect on nonlinear photoluminescence of semimagnetic semiconductor Cd0.8Mn0.2Te,
    Phys. Status Solidi C, 6, (1) 34-37 (2009.01).
    DOI: 10.1002/pssc.200879848


  • T. Yoshioka, K. Miyajima, M. Ashida and T. Itoh,
    Infrared transient absorption spectra for excited transition of excitons and biexcitons in CuCl,
    Phys. Status Solidi C, 6, (1) 296-299 (2009.01).
    DOI: 10.1002/pssc.200879905


  • M. Ashida
    Ultra-broadband Terahertz Wave Detection Using Photoconductive antenna,
    Jpn. J. Appl. Phys. 47, (10) 8221-8225 (2008.10).
    DOI: 10.1143/JJAP.47.8221


           
  • I. Katayama, H. Shimosato, D. S. Rana, I. Kawayama, M. Tonouchi and M. Ashida,
    Hardening of the ferroelectric soft mode in SrTiO3 thin films,
    Appl. Phys. Lett. 93, (13) 132903 (1-3) (2008.9).
    DOI: 10.1063/1.2991442

  • M. Ichimiya, M. Ashida, H. Yasuda, H. Ishihara and T. Itoh,
    Femtosecond-class radiative decay of multinode-type excitons in nano-to-bulk crossover regime,
    J. Luminescence, 128, (5-6) 1062-1064 (2008.05).
    DOI: 10.1016/j.jlumin.2007.11.001


  • H. Yasuda, M. Ichimiya, M. Ashida, T. Itoh and H. Ishihara,
    Real-time analysis of nonlinear transient response of weakly confined excitons,
    J. Luminescence, 128, (5-6) 814-817 (2008.05).
    DOI: 10.1016/j.jlumin.2007.11.016


  • K. Katayama, K. Miyajima, M. Ashida and T. Itoh,
    Oscillatory Structures Originating from the Faraday Rotation of a New Nonlinear Photoluminescence Band of Co0.8Mn0.2Te ,
    J. Korean Physical Society, 52, (5) 1558-1561 (2008.05).


2007


  • I. Katayama, H. Shimosato, M. Ashida, I. Kawayama, M. Tonouchi and T. Itoh,
    Thickness dependence of the soft ferroelectric mode in SrTiO3 thin films deposited on MgO,
    J. Luminescence, 128, 998-1000 (2008.01).
    DOI: 10.1016/j.jlumin.2007.12.026


  • H. Shimosato, M. Ashida, T. Itoh, S. Saito and K. Sakai,
    Ultrabroadband Detection of Terahertz Radiation from 0.1 to 100 THz with Photoconductive Antenna,
    Ultrafast Optics V, Springer Series in Optical Sciences, 132, 317-323 (2007).
    DOI: 10.1007/978-0-387-49119-6_41


  • K. Miyajima, M. Ashida and T. Itoh,
    Quantum confined Biexcitons in CuCl quantum dots and their unconventional optical properties,
    J. Phys. Condens. Matter, 19 (44) 445006 (1-21) (2007.11).
    DOI: 10.1088/0953-8984/19/44/445006


  • K. Miyajima, M. Ashida and T. Itoh,
    Size-selective excitation of biexcitons in CuCl quantum dots un-der two-photon resonant excitation,
    Phys. Status Solidi B, 244, (9) 3297-3302 (2007.09).
    DOI: 10.1002/pssb.200642588


2006


  • M. Ashida, K. Inaba and T. Itoh,
    Optical manipulation of semiconductor quantum dots in superfluid helium,
    SPIE Proceedings, 6468, Photonics with Single-Quantum-Dot Devices XV, (2007.03).
    DOI: 10.1117/12.717243


  • H. Minami, M. Kusunoki, M. Minamiguchi, M. Ichimiya, M. Ashida and T. Itoh,
    Modification of photonic band structure in an ordered polystyrene particle layer by controlling interparticle light-mode interaction,
    J. Luminescence, 122-123, 747-749, (2007.01-04).
    DOI: 10.1016/j.jlumin.2006.01.277


  • K. Inaba, K. Imaizumi, K. Katayama, M. Ichimiya, M. Ashida, T. Iida, H. Ishihara and T. Itoh,
    Optical manipulation of CuCl nanoparticles under an excitonic resonance condition in superfluid helium,
    Phys. Status Solidi B, 243, (14) 3829-3833, *Editor's Choice (2006.11).
    DOI: 10.1002/pssb.200672125


  • Y. Sawada, M. Ichimiya, M. Ashida, S. Shimomura, S. Hiyamizu and T. Itoh,
    Cathodoluminescence properties of GaAs/AlGaAs pyramidal cap structures with high spatical resolution,
    Phys. Status Solidi C, 3, (10) 3553-3556, (2006.11).
    DOI: 10.1002/pssc.200672150

  • H. Shimosato, T. Katashima, S. Saito, M. Ashida, T. Itoh and K. Sakai,
    Ultrabroadband THz spectroscopy using rapid scanning method,
    Phys. Status Solidi C, 3, 10, 3484-3487, (2006.11).
    DOI: 10.1002/pssc.200672154

  • K. Inaba, K. Imaizumi, K. Katayama, M. Ichimiya, M. Ashida, T. Iida, H. Ishihara and T. Itoh,
    Optical manipulation of CuCl nanoparticles under an excitonic resonance condition in superfluid helium,
    Phys. Status Solidi B, 243, (14) 3829-3833, (2006.11).
    DOI: 10.1002/pssc.200672125

  • M. Ichimiya, M. Ashida, H. Yasuda, H. Ishihara and T. Itoh,
    Ultrafast degenerate four-wave mixing in CuCl ultrathin films,
    Phys. Status Solidi B, 243, (14) 3800-3805, (2006.11).
    DOI: 10.1002/pssb.200672122

  • K. Katayama, K. Miyajima, M. Ashida and T. Itoh,
    High-density selective excitation effect on excitons in semimagnetic semiconductor CdMnTe,
    Phys. Status Solidi B, 243, (14) 3806-3811, (2006.11).
    DOI: 10.1002/pssb.200672133

  • K. Miyajima, Y. Kagotani, S. Saito, M. Ashida and T. Itoh,
    Ultrafast emission under two-photon excitation of biexcitons in CuCl quantum dots,
    Phys. Status Solidi B, 243, (14) 3795-3799, (2006.11).
    DOI: 10.1002/pssb.200672142

  • Y. Kagotani, K. Miyajima, S. Saito, M. Ashida and T. Itoh,
    Temporal behavior of biexciton luminescence under two-photon excitaiton in CuCl quantum dots,
    J. Luminescence, 119-120, Spec Iss. 33-37 (2006.07-10).
    DOI: 10.1016/j.jlumin.2005.12.008

2005


  • M. Ichimiya, Y. Sawada, M. Ashida and T. Itoh,
    Free exciton luminescence of ZnO:Zn microcrystals under electron beam excitation,
    Phys. Status Solidi C, 3, (4) 1189-1192 (2006.03).
    DOI: 10.1002/pssc.200564702

  • M. Ichimiya, T. Horii, T. Hirai, Y. Sawada, M. Minamiguchi, N. Ohno, M. Ashida and T. Itoh,
    Nano-scale distribution of ZnO free exciton luminescence in ZnO:Zn microcrystals, and its modification under electron beam excitation,
    J. Phys. Condens. Matter, 18, (6) 1967-1975 (2006.02).
    DOI: 10.1088/0953-8984/18/6/012


  • Y. Kagotani, K. Miyajima, G. Oohata, S. Saito, M. Ashida, K. Edamatsu and T. Itoh,
    Two-photon absorption and lasing due to biexciton in CuCl quantum dots,
    J. Luminescence, 112, (1) 113-116 (2005.04).
    DOI: 10.1016/j.jlumin.2004.09.007

2004


  • G. Oohata, Y. Kagotani, K. Miyajima, M. Ashida, S. Saito, K. Edamatsu and T. Itoh,
    Stable Biexcitonic Lasing of CuCl Quantum Dots Under Two-Photon Resonant Excitation,
    Physica E, 26, (1-4) 347-350 (2005.02).
    DOI: 10.1016/j.physe.2004.08.074

  • K. Miyajima, G. Oohata, Y. Kagotani, M. Ashida, K. Edamatsu and T. Itoh,
    Two-Photon Excitation of Confined Biexcitons in CuCl Quantum Dots,
    Physica E, 26, (1-4) 33-36 (2005.02).
    DOI: 10.1016/j.physe.2004.08.018