JaLCDOI 10.18926/17826
フルテキストURL Mem_Fac_Eng_OU_43_8.pdf
著者 Umeda Ryosuke| 東辻 千枝子| 鶴田 健二| 東辻 浩夫|
抄録 Metamaterial which has negative permittivity and permeability is investigated via computer simulations. Effects of the nanostructure on dielectric and magnetic properties of the material are taken into account by introducing the Drude-Lorentz model in the materials dispersion. We include multi-band process in the dielectric response in order to reproduce accurately experimental values of bulk Au thin film. Size effect on the dispersion is examined by comparing the model with that of a noble metal particle. Based on the dispersion model constructed, we analyze the electromagnetic response of nanostructured metamaterials to evanescent waves at microwave and optical frequencies via finite-difference time-domain simulatioins on parallel computer. A re- focusing and an amplification of the evanescent waves propagating through a metamaterial, consisting of metal slab/vacuum stacking, is demonstrated for the frequencies of 30GHz and 744THz.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2009-01
43巻
開始ページ 8
終了ページ 15
ISSN 1349-6115
言語 English
論文のバージョン publisher
NAID 120002308833
JaLCDOI 10.18926/17829
フルテキストURL Mem_Fac_Eng_OU_43_16.pdf
著者 Kurose Tomoyuki| 鶴田 健二| 東辻 千枝子| 東辻 浩夫|
抄録 The finite-difference time-domain (FDTD) method has been applied to the calculation of the phonon band structure of two-dimensional (2D) phononic crystals, consisting of metal cylinders placed periodically in liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the dependence of the band structures on sound speed and density of liquid media. Moreover, the negative refraction of the acoustic waves is observed at the interfaces between phononic crystal slab and the liquid. We find that an acoustic“lens effect”with the slab appears due to the negative refractions. The relationship between the focal intensity in the lens effect and the band structure is discussed.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2009-01
43巻
開始ページ 16
終了ページ 21
ISSN 1349-6115
言語 English
論文のバージョン publisher
NAID 120002308928
JaLCDOI 10.18926/17831
フルテキストURL Mem_Fac_Eng_OU_43_22.pdf
著者 東辻 浩夫| Chai Hong| 東辻 千枝子| 鶴田 健二|
抄録 For the transfer of quantum information and the creation of entangled states, the application of tuned spin chains, systems of spins with the nearest-neighbor coupling tuned so as to give high efficiency, has been proposed and some examples of high performance have been given by several authors. In this article, the effect of deviations from tuned values and the effect of resultant asymmetry are investigated through numerical simulations and theoretical analyses. It is shown that there exists a system where the transfer efficiency is comparable with exactly tuned ones and, at the same time, robust to noises in the coupling constants. It is also shown that the effect of asymmetry on the efficiency of entanglement creation is of the second order when the asymmetry is small.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2009-01
43巻
開始ページ 22
終了ページ 26
ISSN 1349-6115
言語 English
論文のバージョン publisher
NAID 120002308966
JaLCDOI 10.18926/19954
フルテキストURL Mem_Fac_Eng_OU_44_7.pdf
著者 Maetani Noriaki| Kurose Tomoyuki| 鶴田 健二|
抄録 The lens effect of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in water. Lens effect is observed by the negative refraction of acoustic waves, which results in refocusing of the waves at the point outside the crystal. To increase the focal intensity, we introduce a 2D phononic crystal shield with a different composition of material, which returns the incident waves back to the lens via the perfect reflection. Also, the dependence on filling fraction of metal in the crystal is studied.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2010-01
44巻
開始ページ 7
終了ページ 12
ISSN 1349-6115
言語 English
論文のバージョン publisher
NAID 120002309019
JaLCDOI 10.18926/19953
フルテキストURL Mem_Fac_Eng_OU_44_1.pdf
著者 Nagai Shinji| Umeda Ryosuke| 鶴田 健二|
抄録 In this paper, we investigate a light-confinement phenomenon in the structure which has triangular latice composed of Double NeGative Metamaterial (DNGM). In geometrical optics consideration, this structure is expected to confine lights completely by sequential refractions in the structure. We demonstrate it by using the two dimensional finite-difference time-domain simulations. We introduce Drude-Lorentz model for dielectric and magnetic dispersion of the material at optical frequencies. We analyze quantitatively the effects of energy loss in the DNGM on the light-confinement efficiency.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2010-01
44巻
開始ページ 1
終了ページ 6
ISSN 1349-6115
言語 English
論文のバージョン publisher
NAID 120002309117
フルテキストURL fulltext.pdf
著者 Hada, Masaki| Yamaguchi, Daisuke| Ishikawa, Tadahiko| Sawa, Takayoshi| Tsuruta, Kenji| Ishikawa, Ken| Koshihara, Shin-Ya| Hayashi, Yasuhiko| Kato, Takashi|
発行日 2019-09-13
出版物タイトル Nature Communications
10巻
出版者 Nature Publishing Group
開始ページ 4159
ISSN 2041-1723
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 © The Author(s) 2019
論文のバージョン publisher
PubMed ID 31519876
DOI 10.1038/s41467-019-12116-6
Web of Science KeyUT 000485685200005
関連URL isVersionOf https://doi.org/10.1038/s41467-019-12116-6
フルテキストURL JJAP_59.pdf
著者 Watanabe, Keita| Fujita, Mikiya| Tsuruta, Kenji|
備考 This fulltext is available in Apr. 2021.|
発行日 2020-04-06
出版物タイトル Japanese Journal of Applied Physics
59巻
SK号
出版者 Japan Society of Applied Physics
開始ページ SKKA06
ISSN 0021-4922
NCID AA12295836
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 © 2020 The Japan Society of Applied Physics
論文のバージョン author
DOI 10.35848/1347-4065/ab7e3e
Web of Science KeyUT 000546613200005
オフィシャル URL https://iopscience.iop.org/article/10.35848/1347-4065/ab7e3e|
フルテキストURL fulltext.pdf
著者 Suichi, Takahiro| Ishikawa, Atsushi| Tanaka, Takuo| Hayashi, Yasuhiko| Tsuruta, Kenji|
発行日 2020-04-16
出版物タイトル Scientific Reports
10巻
1号
出版者 Nature
開始ページ 6486
ISSN 2045-2322
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 © The Author(s) 2020
論文のバージョン publisher
PubMed ID 32300158
DOI 10.1038/s41598-020-63591-7
Web of Science KeyUT 000562142100005
関連URL isVersionOf https://doi.org/10.1038/s41598-020-63591-7
著者 Iida, Takumi | Ishikawa, Atsushi| Tanaka, Takuo| Muranaka, Atsuya| Uchiyama, Masanobu| Hayashi, Yasuhiko| Tsuruta, Kenji|
備考 This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Takumi Iida et. al. Super-chiral vibrational spectroscopy with metasurfaces for high-sensitive identification of alanine enantiomers. Appl. Phys. Lett. 117, 101103 (2020) and may be found at https://doi.org/10.1063/5.0012331. </br>This fulltext is available in Sep. 2021.|
発行日 2020-09-09
出版物タイトル Applied Physics Letters
117巻
10号
出版者 American Institute of Physics
開始ページ 101103
ISSN 0003-6951
NCID AA00543431
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン publisher
DOI 10.1063/5.0012331
Web of Science KeyUT 000571581400002
関連URL isVersionOf https://doi.org/10.1063/5.0012331
著者 Takasugi, Shota| Watanabe, Keita| Misawa, Masaaki| Tsuruta, Kenji|
備考 This fulltext is available in Feb. 2022.|
発行日 2021-02-22
出版物タイトル Japanese Journal of Applied Physics
60巻
SD号
出版者 IOP Publishing
開始ページ SDDA01
ISSN 0021-4922
NCID AA12295836
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン author
DOI 10.35848/1347-4065/abe2e5
Web of Science KeyUT 000621475200001
関連URL isVersionof https://doi.org/10.35848/1347-4065/abe2e5