Nakajima Makoto

J-GLOBAL         Last updated: Mar 21, 2019 at 02:41
 
Avatar
Name
Nakajima Makoto
Affiliation
Osaka University
Section
.
Job title
Associate Professor
Research funding number
40361662

Research Areas

 
 

Published Papers

 
Rapid Faraday Rotation on Epsilon-Iron Oxide Magnetic Nanoparticles by Visible- and THz-Pulsed Lights
Shin-ichi Ohkoshi, Kenta Imoto, Asuka Namai, Marie Yoshikiyo, Seiji Miyashita, Hongsong Qiu, Shodai Kimoto, Kousaku Kato, and Makoto Nakajima
Journal of the American Chemical Society      Jan 2019   [Refereed]
Kotaro Makino, Kosaku Kato, Keisuke Takano, Yuta Saito, Junji Tominaga, Takashi Nakano, Goro Isoyama, Makoto Nakajima
Scientific Reports   8    Dec 2018
© 2018 The Author(s). With rapid advances occurring in terahertz (THz) radiation generation techniques, the interaction between matter and intense THz fields has become an important research topic. Among different types of THz radiation sources, t...
Takayuki Kurihara, Hongsong Qiu, Kosaku Kato, Hiroshi Watanabe, Makoto Nakajima
Applied Physics Letters   113    Sep 2018
© 2018 Author(s). Due to its efficient coupling with electron spins, the application of terahertz magnetic nearfield in metallic microstructures has been attracting attention. While paramagnetic materials that exhibit magneto-optical effect have b...
Hongsong Qiu, Lei Wang, Zhixiong Shen, Kosaku Kato, Nobuhiko Sarukura, Masashi Yoshimura, Wei Hu, Yanqing Lu, Makoto Nakajima
Applied Physics Express   11    Sep 2018
© 2018 The Japan Society of Applied Physics A magnetically and electrically polarization-tunable terahertz emitter that integrates a ferromagnetic heterostructure and large-birefringence liquid crystals is demonstrated. The heterostructure and the...
Yasunori Tokuda, Keisuke Takano, Koichiro Sakaguchi, Kosaku Kato, Makoto Nakajima, Koichi Akiyama
AIP Advances   8    Sep 2018
© 2018 Author(s). We investigated the optical transmission properties of a metamaterial system in which a natural dielectric is inserted between metallic sub-wavelength slit arrays that behave as an artificial dielectric when the incident light wa...
Yasunori Tokuda, Keisuke Takano, Koichiro Sakaguchi, Kosaku Kato, Makoto Nakajima, Koichi Akiyama
Journal of Applied Physics   123    May 2018
© 2018 Author(s). Detailed measurements of the optical properties of two-tier systems composed of metallic plates perforated with periodic sub-wavelength slit patterns were carried out using terahertz time-domain spectroscopy. We demonstrate that ...
Layer thickness dependence of the terahertz emission based on spin current in ferromagnetic heterostructures
H. Qiu, K. Kato, K. Hirota, N. Sarukura, M. Yoshimura, and M. Nakajima
Optics Express   26 15247-15254   May 2018   [Refereed]
Keisuke Takano, Keisuke Takano, Hirofumi Harada, Masashi Yoshimura, Makoto Nakajima
Applied Physics Letters   112    Apr 2018
© 2018 Author(s). We show that silver nanoparticles, which are deposited on a terahertz-receiving antenna, can be sintered by intense terahertz pulse irradiation. The conductance of the silver nanoparticles between the antenna electrodes is measur...
Hongsong Qiu, Takayuki Kurihara, Takayuki Kurihara, Hirofumi Harada, Kosaku Kato, Keisuke Takano, Keisuke Takano, Tohru Suemoto, Masahiko Tani, Nobuhiko Sarukura, Masashi Yoshimura, Makoto Nakajima
Optics Letters   43 1658-1661   Apr 2018
© 2018 Optical Society of America. Substantial enhancement of terahertz magnetic near field achieved by the combination of a tapered metallic waveguide and a micro-split-ring resonator is demonstrated. The magnetic near field is probed directly vi...
Takayuki Kurihara, Takayuki Kurihara, Hiroshi Watanabe, Hiroshi Watanabe, Makoto Nakajima, Shutaro Karube, Shutaro Karube, Kenichi Oto, Yoshi Chika Otani, Yoshi Chika Otani, Tohru Suemoto, Tohru Suemoto
Physical Review Letters   120 107202-1-107202-6   Mar 2018   [Refereed]
© 2018 American Physical Society. We exploit an intense terahertz magnetic near field combined with femtosecond laser excitation to break the symmetry of photoinduced spin reorientation paths in ErFeO3. We succeed in aligning macroscopic magnetiza...
Hiroki Miyaji, Adam Pander, Adam Pander, Keisuke Takano, Hideo Kohno, Hideo Kohno, Akimitsu Hatta, Akimitsu Hatta, Makoto Nakajima, Hiroshi Furuta, Hiroshi Furuta
Diamond and Related Materials   83 196-203   Mar 2018
© 2018 Elsevier B.V. In this paper, the optical properties of a frost column-like carbon nanotube (CNT) forest, a hybrid structure of carbon film and a CNT forest, in which carbon films are supported by low-density, vertically-aligned CNT forests,...
Adam Pander, Adam Pander, Keisuke Takano, Akimitsu Hatta, Akimitsu Hatta, Makoto Nakajima, Hiroshi Furuta, Hiroshi Furuta
Diamond and Related Materials   80 99-107   Nov 2017
© 2017 Electrically anisotropic one-dimensional materials, like carbon nanotubes (CNTs), have high potential to become substitutes to conventional metamaterials made of metals, and to overcome their limitations. The exceptional properties of CNT m...
K. Makino, K. Kato, K. Takano, S. Kuromiya, M. Nakajima, Y. Saito, J. Tominaga, T. Nakano
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz      Oct 2017
© 2017 IEEE. Exploiting of unique quantum states in topological insulators is expected to realize new applications of THz technology. Among various kinds of topological materials, GeTe/Sb2Te3, that is multilayered system consist of topological ins...
Boyoung Kang, Keisuke Takano, Makoto Nakajima, Sang Bae Choi, Duckjong Kim, Hakjoo Lee
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz      Oct 2017
© 2017 IEEE. We suggest a novel method for a portable and real-time THz imager operating at room temperature based on metamaterial-cholesteric liquid crystal hybrid structure. The induced local field enhancement at metasurface improved the sensiti...
Fumiyoshi Kuwashima, Takuya Shirao, Yusuke Akamine, Kazuyuki Iwao, Manatsu Ooi, Naoya Sakaue, Takurou Sirasaki, Siori Gouda, Masahiko Tani, Kazuyoshi Kurihara, Kohji Yamamoto, Osamu Morikawa, Hideaki Kitahara, Makoto Nakajima
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz      Oct 2017
© 2017 IEEE. The generation of a wide-range THz wave is investigated from a photoconductive antenna excited using a chaotic oscillation multimode semiconductor laser with optical delayed feedback by an external mirror. The stable THz wave is obtai...
Lei Wang, Lei Wang, Lei Wang, Shijun Ge, Wei Hu, Makoto Nakajima, Yanqing Lu
Optics Express   25 23873-23879   Oct 2017
© 2017 Optical Society of America. In this paper, few-layer porous graphene is integrated onto the surface of a metasurface layer to provide a uniform static electric field to efficiently control liquid crystal, thereby enabling flexible metamater...
Takaya Higashira, Tomoaki Kageyama, Kouhei Kashiwagi, Hidetoshi Miyashita, Keisuke Takano, Makoto Nakajima, Sang Seok Lee
Journal of Infrared, Millimeter, and Terahertz Waves   38 1098-1106   Sep 2017
© 2017, Springer Science+Business Media New York. In this study, we investigated the influence of the distance between metal squares in self-complementary metal checkerboard patterns (CPs) on the transmittance characteristics in the infrared (IR) ...
Keisuke Takano, Keisuke Takano, Yoku Tanaka, Gabriel Moreno, Abdallah Chahadih, Abbas Ghaddar, Xiang Lei Han, François Vaurette, Yosuke Nakata, Yosuke Nakata, Fumiaki Miyamaru, Fumiaki Miyamaru, Makoto Nakajima, Masanori Hangyo, Tahsin Akalin
Journal of Applied Physics   122    Aug 2017
© 2017 Author(s). The design of a self-complementary metallic checkerboard pattern achieves broadband, dispersion-less, and maximized absorption, concentrating in deep subwavelength resistive connections between squares, without any theoretical li...
Kosaku Kato, Hongsong Qiu, Eduard M. Khutoryan, Eduard M. Khutoryan, Yoshinori Tatematsu, Masahiko Tani, Toshitaka Idehara, Yuusuke Yamaguchi, Masafumi Fukunari, Yuto Maeda, Kyoya Takayama, Yuki Minami, Melvin John F. Empizo, Takayuki Kurihara, Kohei Yamanoi, Toshihiko Shimizu, Keisuke Takano, Nobuhiko Sarukura, Tsuguo Fukuda, Masashi Yoshimura, Makoto Nakajima
Applied Physics Letters   111    Jul 2017
© 2017 Author(s). We report the strong yellow emission of bulk ZnO single crystals irradiated with the high-power gyrotron beam. Hydrothermally grown bulk crystals with high conductivity are irradiated at room temperature with up to 60-W output of...
S. Miyasaka, M. Uekubo, H. Tsuji, M. Nakajima, S. Tajima, T. Shiota, H. Mukuda, H. Sagayama, H. Nakao, R. Kumai, Y. Murakami
Physical Review B   95    Jun 2017
© 2017 American Physical Society. The phase diagram of the LaFeAs1-xPxO system has been extensively studied through hole and electron doping as well as As/P substitution. It has been revealed that there are three different superconducting phases w...
Melvin John F. Empizo, Kohei Yamanoi, Kazuyuki Mori, Keisuke Iwano, Yuki Iwasa, Yuki Minami, Ren Arita, Kazuhito Fukuda, Keisuke Takano, Toshihiko Shimizu, Makoto Nakajima, Masashi Yoshimura, Nobuhiko Sarukura, Takayoshi Norimatsu, Masanori Hangyo, Hiroshi Azechi, Tsuguo Fukuda, Bess G. Singidas, Roland V. Sarmago, Makoto Oya, Yoshio Ueda
Journal of Applied Physics   121    May 2017
© 2017 Author(s). In realizing zinc oxide (ZnO) scintillator applications, we assess the optical damage and investigate the recovery of hydrogen-ion (H-ion) and deuterium-ion (D-ion) plasma-irradiated bulk ZnO single crystals. Hydrothermal-grown b...
D. Li, Y. Wang, M. Nakajima, M. Tani, M. Hashida, M. R. Asakawa, Y. Wei, S. Miyamoto
Applied Physics Letters   110    Apr 2017
© 2017 Author(s). This letter reports an approach to realize coherent radiation at the fundamental frequency of the wave that is resonant with the electron beam in a Smith-Purcell (SP) free-electron laser (FEL). We found that a two-dimensional gra...
Yasunori Tokuda, Keisuke Takano, Yuki Yamaguchi, Koichiro Sakaguchi, Makoto Nakajima
Japanese Journal of Applied Physics   56    Mar 2017
© 2017 The Japan Society of Applied Physics. We investigated the optical transmission properties of quasi-dielectric metamaterials composed of a stack of metallic sub-wavelength slit-Array slabs. First, we used simulations to predict the transmiss...
Lei Wang, Lei Wang, Shijun Ge, Wei Hu, Makoto Nakajima, Yanqing Lu
Optical Materials Express   7 2023-2029   Jan 2017
© 2017 Optical Society of America. Tunable liquid crystal devices that can change terahertz wave polarization continuously have many potential applications in terahertz optical systems. We present a reflective liquid crystal terahertz waveplate wi...
Hiroshi Furuta, Adam Pander, Keisuke Takano, Hiroki Miyaji, Akimitsu Hatta, Makoto Nakajima
Optics InfoBase Conference Papers   Part F78-JSAP 2017    Jan 2017
Adam Pander, Keisuke Takano, Makoto Nakajima, Akimitsu Hatta, Hiroshi Furuta
Nanotechnology Materials and Devices Conference, NMDC 2016 - Conference Proceedings      Dec 2016
© 2016 IEEE. The exceptional properties of carbon nanotube metamaterial - a synergy between CNT forest and electromagnetic circuits, is highly expected. In this work, infrared optical properties of patterned CNT forest for metamaterial will be pre...
M. Nakajima, T. Kurihara, Y. Tadokoro, B. Kang, K. Takano, K. Yamaguchi, H. Watanabe, K. Oto, T. Suemoto, M. Hangyo
Journal of Infrared, Millimeter, and Terahertz Waves   37 1199-1212   Dec 2016
© 2016, Springer Science+Business Media New York. Applications of high-field terahertz pulses are attractive in physics and terahertz technology. In this study, two applications related to high-intensity terahertz pulses are demonstrated. The fiel...
Kohei Yamanoi, Melvin John F. Empizo, Kazuyuki Mori, Keisuke Iwano, Yuki Minami, Ren Arita, Yuki Iwasa, Kazuhito Fukuda, Kosaku Kato, Keisuke Takano, Toshihiko Shimizu, Makoto Nakajima, Masashi Yoshimura, Nobuhiko Sarukura, Takayoshi Norimatsu, Masanori Hangyo, Hiroshi Azechi, Tsuguo Fukuda, Bess G. Singidas, Roland V. Sarmago, Makoto Oya, Yoshio Ueda
Optical Materials   62 646-650   Dec 2016
© 2016 Elsevier B.V. Hydrothermal-grown bulk zinc oxide (ZnO) single crystals are investigated before and after 1-keV hydrogen-ion and deuterium-ion plasma irradiation. A decrease in optical transmittance, red-shifting of ultraviolet (UV) emission...
Kotaro Makino, Shota Kuromiya, Keisuke Takano, Kosaku Kato, Makoto Nakajima, Yuta Saito, Junji Tominaga, Hitoshi Iida, Moto Kinoshita, Takashi Nakano
ACS Applied Materials and Interfaces   8 32408-32413   Nov 2016
© 2016 American Chemical Society. We proposed and demonstrated terahertz (THz) pulse detection by means of multilayered GeTe/Sb2Te3phase-change memory materials that are also known as a multilayer topological insulator-normal insulator (MTN) syste...
K. Makino, S. Kuromiya, K. Takano, K. Kato, M. Nakajima, H. Iida, M. Kinoshita, Y. Saito, J. Tominaga, T. Nakano
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2016-November    Nov 2016
© 2016 IEEE. We propose electrical THz detection based on topological insulators which have Dirac electrons. Among them, multi-layered topological insulator system is expected to stack topological interface states and hence enhancement of photo ab...
T. Higashira, T. Kageyama, K. Kashiwagi, H. Miyashita, K. Takano, M. Nakajima, S. S. Lee
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2016-November    Nov 2016
© 2016 IEEE. Checkerboard patterns (CPs) are a kind of metamaterials which have simple structure. Electromagnetic responses of CPs are unique and drastically changed by the configuration variation of self-complementary metal CPs. In this study, we...
H. S. Qiu, H. Harada, K. Kato, K. Takano, T. Kurihara, T. Suemoto, M. Tani, N. Sarukura, M. Yoshimura, M. Nakajima
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2016-November    Nov 2016
© 2016 IEEE. We report on the enhancement of the terahertz magnetic near-field which is realized by a tapered waveguide. A Tb3Ga5O12crystal coupled with a double split-ring resonator was pumped by this tightly confined terahertz field, and the mag...
D. Li, Y. Wang, M. Nakajima, M. Hashida, Y. Wei, S. Miyamoto, M. Tani
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2016-November    Nov 2016
© 2016 IEEE. A method to extract terahertz radiation from surface plasmon polaritons excited in the surface of a uniform graphene structure by an electron beam is presented. A sidewall configuration is proposed to lift the surface plasmon mode to ...
Fumiyoshi Kuwashima, Takuya Shirao, Toshihiro Kishibata, Yusuke Akamine, Noriyuki Iwao, Manatu Ooi, Naoya Sakaue, Takurou Sirasaki, Siori Gouda, Masahiko Tani, Kazuyoshi Kurihara, Kohji Yamamoto, Takeshi Nagashima, Makoto Nakajima, Masanori Hangyo
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2016-November    Nov 2016
© 2016 IEEE. Generation of a wide-range THz waves from a photoconductive antenna excited using a chaotic oscillation multimode semiconductor laser with optical delayed feedback by an external mirror are investigated. The properties of the generate...
T. Kurihara, H. Watanabe, M. Nakajima, T. Suemoto
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   2016-November    Nov 2016
© 2016 IEEE. Terahertz (THz) magnetic field directly interacts with spin systems through Zeeman torque, enabling selective excitation of magnetic order dynamics. Here we demonstrate coherent THz-control of macroscopic magnetization in ErFeO3 using...
Keisuke Iwano, Kohei Yamanoi, Yuki Iwasa, Kazuyuki Mori, Yuki Minami, Ren Arita, Takuma Yamanaka, Kazuhito Fukuda, Melvin John F. Empizo, Keisuke Takano, Toshihiko Shimizu, Makoto Nakajima, Masashi Yoshimura, Nobuhiko Sarukura, Takayoshi Norimatsu, Masanori Hangyo, Hiroshi Azechi, Bess G. Singidas, Roland V. Sarmago, Makoto Oya, Yoshio Ueda
AIP Advances   6    Oct 2016
© 2016 Author(s). We investigate the optical transmittances of ion-irradiated sapphire crystals as potential vacuum ultraviolet (VUV) to near-infrared (NIR) window materials of fusion reactors. Under potential conditions in fusion reactors, sapphi...
D. Li, Y. Wang, M. Nakajima, M. Hashida, Y. Wei, S. Miyamoto
Physics Letters, Section A: General, Atomic and Solid State Physics   380 2181-2184   Jun 2016
© 2016 Elsevier B.V. This letter presents an approach to extract terahertz radiation from surface plasmon polaritons excited in the surface of a uniform graphene structure by an electron beam. A sidewall configuration is proposed to lift the surfa...
Kosaku Kato, Keisuke Takano, Yuzuru Tadokoro, Makoto Nakajima
Optics Letters   41 2125-2128   May 2016
© 2016 Optical Society of America. We demonstrate terahertz pulse generation from silver nanoparticle ink, originally developed for printed electronics, under irradiation by femtosecond laser pulses. Using metal nanoparticle ink, metallic nanostru...
Tatsunosuke Matsui, Tatsunosuke Matsui, Hiroki Mori, Yuto Inose, Shota Kuromiya, Shota Kuromiya, Keisuke Takano, Makoto Nakajima, Masanori Hangyo
Japanese Journal of Applied Physics   55    Mar 2016
© 2016 The Japan Society of Applied Physics. Terahertz (THz)-transmission modulation through the Si substrate coated with four ?-conjugated materials under various laser light irradiation conditions was investigated using THz time-domain spectrosc...
Makoto Nakajima
2015 11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015   3    Jan 2016
© 2015 IEEE. Impulsive excitation of terahertz magnetic field induces spin precession motions and the spin dynamics are probed. The results of temperature dependence in ErCrO3and enhancement of spin precession amplitudes using metamaterial in ErFe...
Kosaku Kato, Keisuke Takano, Yuzuru Tadokoro, Thanh Nhat Khoa Phan, Makoto Nakajima
Proceedings of SPIE - The International Society for Optical Engineering   10030    Jan 2016
© 2016 SPIE. Terahertz pulse generation from metallic nanostructures irradiated by femtosecond laser pulses is of interest because the conversion efficiency from laser pulses to terahertz waves is increased by the local field enhancement resulting...
Takahiro Matsui, Satoshi Tomita, Motoki Asai, Yuzuru Tadokoro, Keisuke Takano, Makoto Nakajima, Masanori Hangyo, Hisao Yanagi
Applied Physics A: Materials Science and Processing   122    Jan 2016
© Springer-Verlag Berlin Heidelberg 2016. Plasmonic chiral metasurfaces with pinwheellike structures are fabricated on silver films using a focused ion-beam milling technique. In time-domain spectroscopy, we observe terahertz (THz) wave emission f...
T. Higashira, T. Kageyama, K. Kashiwagi, H. Miyashita, K. Takano, M. Nakajima, S. S. Lee
IRMMW-THz 2015 - 40th International Conference on Infrared, Millimeter, and Terahertz Waves      Nov 2015
© 2015 IEEE. Checkerboard patterns (CPs) are a kind of metamaterials which are attracting much attention for their application to sensing devices. In this study, we have investigated the electromagnetic responses of the CPs in infrared (IR) region...
Fumiyoshi Kuwashima, Takuya Shirao, Toshihiro Kishibata, Yusuke Akamine, Noriyuki Iwao, Manatu Ooi, Masahiko Tani, Kazuyoshi Kurihara, Kohji Yamamoto, Takeshi Nagashima, Makoto Nakajima, Masanori Hangyo
IRMMW-THz 2015 - 40th International Conference on Infrared, Millimeter, and Terahertz Waves      Nov 2015
© 2015 IEEE. Generation of a wide-range THz waves are investigated from a photoconductive antenna excited using a chaotic oscillation multimode semiconductor laser with optical delayed feedback by an external mirror. The properties of the generate...
Kenichiro Hanai, Keisuke Takano, Fumiaki Miyamaru, Fumiaki Miyamaru, Tsubasa Nishida, Makoto Nakajima, Masanori Hangyo, Riad Yahiaoui
IRMMW-THz 2015 - 40th International Conference on Infrared, Millimeter, and Terahertz Waves      Nov 2015
© 2015 IEEE. A terahertz wave absorber composed of dielectric spheres is proposed. The proposed absorber offers advantages compared to other metamaterial-based absorbers owing to low-cost and flexibility of fabrication that strongly relaxes the co...
Shota Kamimura, Akira Date, Makoto Nakajima, Grzegorz Karczewski, Tomasz Wojtowicz, Jacek Kossut, Takuma Tsuchiya, Hirofumi Mino
Journal of the Physical Society of Japan   84    Oct 2015
© 2015 The Physical Society of Japan. Photoinduced exciton spin states in diluted magnetic semiconductor CdTe=Cd<inf>0.88</inf>Mn<inf>0.12</inf>Te quantum wells (QWs) were investigated by the time-resolved Kerr rotation (TRKR) technique at various...
Yuzuru Tadokoro, Tomohiro Nishikawa, Boyoung Kang, Keisuke Takano, Masanori Hangyo, Makoto Nakajima
Optics Letters   40 4456-4459   Oct 2015
© 2015 Optical Society of America. We demonstrate a sensor card with cholesteric liquid crystals (CLCs) for terahertz (THz) waves generated from a nonlinear crystal pumped by a table-top laser. A beam profile of the THz waves is successfully visua...
Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, Tohru Suemoto
Physical Review B - Condensed Matter and Materials Physics   92    Aug 2015
© 2015 American Physical Society. The effects of femtosecond laser excitation on the anisotropy parameter in orthoferrites ErFeO3 and DyFeO3 were probed through Faraday rotation induced by coherent spin precession, which was triggered by a teraher...
Yuanyuan Wang, Yanyu Wei, Dazhi Li, Keisuke Takano, Makoto Nakajima, Xuebing Jiang, Xianfeng Tang, Xianbao Shi, Yubin Gong, Jinjun Feng, Shuji Miyamoto
Physics of Plasmas   22    Aug 2015
© 2015 AIP Publishing LLC. We present an analysis of a Cherenkov free-electron laser based on a single slab made from negative-index materials. In this system, a flat electron beam with finite thickness travelling close to the surface of the slab ...
Keita Yamaguchi, Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, Takeo Kato, Tohru Suemoto
Springer Proceedings in Physics   162 645-648   Jan 2015
© Springer International Publishing Switzerland 2015. Terahertz pulse induced spin precession in ErFeO3 was observed via the Faraday rotation of the near infrared probe pulse. Unreported splitting of the magnetic resonance was discovered and mecha...
Makoto Nakajima, Yuzuru Tadokoro, Keisuke Takano, Masanori Hangyo
Nonlinear Optics, NLO 2015      Jan 2015
© 2015 OSA. The electrical resistance falls down several orders for aluminum particles by single-shot terahertz intense pulse irradiation. We confirmed that the electron conduction paths are induced in a direction parallel to polarization of incid...
Riad Yahiaoui, Kenichiro Hanai, Keisuke Takano, Tsubasa Nishida, Fumiaki Miyamaru, Fumiaki Miyamaru, Makoto Nakajima, Masanori Hangyo
Optics Letters   40 3197-3200   Jan 2015
© 2015 Optical Society of America. Quasi-monodisperse dielectric particles organized in a periodic hexagonal network on an aluminum surface are exploited numerically and experimentally as a single-layered near-perfect absorber in the terahertz reg...
T. Kurihara, K. Nakamura, K. Yamaguchi, Y. Sekine, Y. Saito, M. Nakajima, M. Nakajima, K. Oto, H. Watanabe, T. Suemoto
Physical Review B - Condensed Matter and Materials Physics   90    Oct 2014
© 2014 American Physical Society. We demonstrate enhancement of the spin precession of orthoferrite ErFeO3 using the magnetic near-field produced by a split-ring resonator (SRR), using the terahertz pump-optical Faraday probe measurement. The prec...
K. Makino, S. Kuromiya, K. Takano, K. Kato, M. Nakajima, H. Iida, M. Kinoshita, Y. Saito, J. Tominaga, T. Nakano
Optics InfoBase Conference Papers      Jul 2014
We report THz detection with GeTe/Sb2Te3 multi-layered topological insulator. Photoconductive-type detector device was fabricated and THz-induced change of the current was clearly observed when the DC bias voltage was applied and THz pulse was irr...
Marie Yoshikiyo, Asuka Namai, Makoto Nakajima, Keita Yamaguchi, Tohru Suemoto, Shin Ichi Ohkoshi, Shin Ichi Ohkoshi
Journal of Applied Physics   115    May 2014
In this work, we prepared indium-substituted ε-iron oxide (ε-InxFe2-xO3) spherical nanoparticles by a combination method of reverse-micelle and sol-gel techniques. The powder X-ray diffraction pattern with Rietveld analysis shows that ε-InxFe2-xO3...
Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, Takeo Kato, Tohru Suemoto
Optics InfoBase Conference Papers      Jan 2014
Terahertz pulse induced spin precession in ErFeO3was observed via the Faraday rotation of the visible probe pulse. Unreported splitting of the magnetic resonance was discovered and mechanism explaining this splitting is proposed. © 2014 OSA.
T. Kurihara, K. Nakamura, K. Yamaguchi, Y. Sekine, Y. Saito, M. Nakajima, K. Oto, H. Watanabe, T. Suemoto
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz      Jan 2014
© 2014 IEEE. Terahertz metamaterial technique enables a sophisticated electromagnetic excitation of materials. Here, we demonstrate resonant excitation of spin precession motion of canted antiferromagnet ErFeO3using the magnetic near-field produce...
T. Kurihara, K. Yamaguchi, H. Watanabe, M. Nakajima, T. Suemoto
Applied Physics Letters   103    Oct 2013
Dielectric material was used as the probe material for a scattering-type terahertz scanning near-field optical microscope (THz S-SNOM). It was found that the dielectric probe exhibits a strong near-field scattering signal with an amplitude compara...
Asuka Namai, Marie Yoshikiyo, Sayaka Umeda, Takayuki Yoshida, Tatsuro Miyazaki, Makoto Nakajima, Keita Yamaguchi, Tohru Suemoto, Shin Ichi Ohkoshi, Shin Ichi Ohkoshi
Journal of Materials Chemistry C   1 5200-5206   Sep 2013
In this study, we demonstrate a synthesis of rhodium substituted ε-iron oxide, ε-RhxFe2-xO3(0 ≤ x ≤ 0.19), nanoparticles in silica. The synthesis features a sol-gel method to coat the metal hydroxide sol containing Fe3+and Rh3+ions with a silica s...
Ryo Fukaya, Ryo Fukaya, Akifumi Asahara, Shun Ishige, Makoto Nakajima, Makoto Nakajima, Hiroko Tokoro, Shin Ichi Ohkoshi, Tohru Suemoto
Journal of Chemical Physics   139    Aug 2013
Resonant couplings of the electronic states and the stretching vibrations of CN-ligands, which bridges metal ions, is investigated by resonance Raman spectroscopy for Rb0.94Mn[Fe(CN)6]0.98·0.2H2O. Large excitation wavelength dependences over one o...
Tohru Suemoto, Shigeyuki Sakaki, Makoto Nakajima, Yukiaki Ishida, Shik Shin
Physical Review B - Condensed Matter and Materials Physics   87    Jun 2013
Ultrafast dynamics of holes in a solid is usually hard to observe directly because the optical transition includes both electron and hole dynamics. In this paper we show an approach combining femtosecond luminescence and photoemission spectroscopy...
Yasuyuki Hirata, Makoto Nakajima, Yusuke Nomura, Hiroyuki Tajima, Yoshitaka Matsushita, Keiko Asoh, Yoko Kiuchi, Adolfo G. Eguiluz, Ryotaro Arita, Tohru Suemoto, Kenya Ohgushi
Physical Review Letters   110    May 2013
The structural, electronic, and optical properties of pyrochlore-type Pb2Ir2O6O0.55′, which is a metal without spatial inversion symmetry at room temperature, were investigated. Structural analysis revealed that the structural distortion relevant ...
Yasuo Minami, Takayuki Kurihara, Keita Yamaguchi, Makoto Nakajima, Tohru Suemoto
Applied Physics Letters   102    Apr 2013
We have generated and detected a longitudinally polarized (Z-polarized) terahertz (THz) wave by focusing a conically propagating THz beam generated from a plasma filament induced by a femtosecond laser pulse. In the experiment, we observed a radia...
Keita Yamaguchi, Takayuki Kurihara, Yasuo Minami, Makoto Nakajima, Tohru Suemoto
Physical Review Letters   110    Mar 2013
Terahertz time domain spectroscopy was performed on orthoferrite ErFeO3. Through the emission from the two magnetic resonance modes, we succeeded in observing the spin reorientation transition. Depending on the orientation of the single crystal, t...
Yasuo Minami, Takayuki Kurihara, Keita Yamaguchi, Makoto Nakajima, Tohru Suemoto
Applied Physics Letters   102    Feb 2013
Yasuo Minami, Takayuki Kurihara, Keita Yamaguchi, Makoto Nakajima, Tohru Suemoto
Applied Physics Letters   102    Jan 2013
We introduce a simple and efficient method of enhancing the terahertz field in an air plasma produced by two-color laser pulses, by inserting a specially designed dual-wavelength wave plate between the non-linear optical crystal and the plasma. Ad...
Keita Yamaguchi, Takayuki Kurihara, Yasuo Minami, Makoto Nakajima, Tohru Suemoto
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz      Dec 2012
We performed terahertz time domain spectroscopy on erbium orthoferrite. The spin reorientation transition was observed as switching of magnetic radiation mode between F and AF mode, and the change in the polarization of the radiation. © 2012 IEEE.
Akifumi Asahara, Makoto Nakajima, Makoto Nakajima, Ryo Fukaya, Ryo Fukaya, Hiroko Tokoro, Shin Ichi Ohkoshi, Tohru Suemoto
Physical Review B - Condensed Matter and Materials Physics   86    Nov 2012
Photoinduced phase switching dynamics between LTP (low-temperature phase: Fe2+-CN-Mn3+) and PIHTP (photoinduced high-temperature phase: Fe3+-CN-Mn2+) in rubidium manganese hexacyanoferrate at 4K was investigated by visible pump midinfrared probe t...
Asuka Namai, Marie Yoshikiyo, Kana Yamada, Shunsuke Sakurai, Takashi Goto, Takayuki Yoshida, Tatsuro Miyazaki, Makoto Nakajima, Tohru Suemoto, Hiroko Tokoro, Shin Ichi Ohkoshi, Shin Ichi Ohkoshi
Nature Communications   3    Oct 2012
Magnetic ferrites such as Fe3O4and Fe2O3are extensively used in a range of applications because they are inexpensive and chemically stable. Here we show that rhodium-substituted ε-Fe2O3, ε-Rh x Fe 2-x O3nanomagnets prepared by a nanoscale chemical...
Marie Yoshikiyo, Asuka Namai, Makoto Nakajima, Tohru Suemoto, Shin Ichi Ohkoshi, Shin Ichi Ohkoshi
Journal of Applied Physics   111    Apr 2012
In this work, we studied the temperature dependence of millimeter wave absorption due to natural resonance, zero-field ferromagnetic resonance, in ε-Al0.06Fe1.94O3. The natural resonance frequency (fr) was recorded at a high value of 172 GHz at ro...
A. Asahara, M. Nakajima, R. Fukaya, H. Tokoro, S. Ohkoshi, T. Suemoto
Acta Physica Polonica A   121 375-378   Feb 2012
Rubidium manganese hexacyanoferrate exhibits charge transfer phase transition from high temperature phase to low temperature phase at 230 K. This phase transition can also be triggered by light irradiation resonantly inducing charge transfer from ...
M. Nakajima, K. Yamaguchi, T. Suemoto
Acta Physica Polonica A   121 343-346   Jan 2012
We demonstrated coherent control of spin precession motion due to the ferromagnetic resonance induced by magnetic field component of ultrashort terahertz pulses. The amplitude of the precession can be controlled by the pulse separation time of the...
Y. Ishida, Y. Ishida, T. Togashi, K. Yamamoto, K. Yamamoto, M. Tanaka, T. Taniuchi, T. Kiss, M. Nakajima, T. Suemoto, S. Shin, S. Shin, S. Shin
Scientific Reports   1    Dec 2011
Investigation of the non-equilibrium dynamics after an impulsive impact provides insights into couplings among various excitations. A two-temperature model (TTM) is often a starting point to understand the coupled dynamics of electrons and lattice...
Christopher T. Que, Tadataka Edamura, Tadataka Edamura, Makoto Nakajima, Makoto Nakajima, Masahiko Tani, Masanori Hangyo, Masanori Hangyo
Japanese Journal of Applied Physics   50    Aug 2011
Enhancement of the pulsed terahertz radiation generated from a lens-coupled InAs thin film excited by a femtosecond laser is reported. A Si hemispherical lens was used as a lens coupler and attached to the substrate-side of a 520-nm-thick InAs fil...
T. Suemoto, H. Nakao, M. Nakajima, H. Kitagawa
Journal of Chemical Physics   134    Jun 2011
The out-of-phase and in-phase ladder type Br-bridged Pt complexes are investigated by time-resolved luminescence spectroscopy in pico- and femtosecond time regions. The observed luminescence spectra have peaks at 0.87 and 0.94eV in out-of-phase an...

Research Grants & Projects

 
Ultrafast terahertz switching in organic bistable material
日本学術振興会: 新学術領域研究(研究領域提案型)
Project Year: Apr 2018 - Mar 2020    Investigator(s): 中嶋 誠
Spin manipulation using high power THz pulse
日本学術振興会: 基盤研究(B)
Project Year: Apr 2017 - Mar 2020    Investigator(s): 森田 健
Ultrafast control of conductive state by terahertz pulses
日本学術振興会: 基盤研究(B)
Project Year: Apr 2016 - Mar 2019    Investigator(s): 中嶋 誠
Control of spin order and non-linear phenomena induced by intense terahertz magnetic field
日本学術振興会: 基盤研究(B)
Project Year: Apr 2014 - Mar 2017    Investigator(s): 末元 徹
Ultrafast spin manipulation using the intense THz pulse
日本学術振興会: 基盤研究(C)
Project Year: Apr 2014 - Mar 2017    Investigator(s): 森田 健