Papers - Hasegawa Koji

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  1. Computing group velocities and group-velocity dispersions of optical fibers through automatic differentiation of explicit forms of propagation constants

    Yasuo Tsushima, Koji Hasegawa，Journal of Lightwave Technology，2020.08

  2. Hybrid Trefftz Finite-Element Method for Analyzing the Eigenmodes of Optical Fibers

    Shingo Sato, Koji Hasegawa, Naoya Mizukami, and Yasuo Tsushima，Journal of Lightwave Technology，vol.37，(3)，(p.1029 ～ 1036)，2019.02

  3. Finding Propagation Constants of Leaky and Degenerate Modes Using Simultaneous Transcendental Equations of Holey Optical Fibers

    Sato Shingo, Hasegawa Koji, Tsushima Yasuo，JOURNAL OF LIGHTWAVE TECHNOLOGY，vol.35，(14)，(p.2871 ～ 2879)，2017.07

  4. Resonant frequency analysis of a Lame-mode resonator on a quartz plate by the finite-difference time-domain method using the staggered grid with the collocated grid points of velocities

    Yasui Takashi, Hasegawa Koji, Hirayama Koichi，JAPANESE JOURNAL OF APPLIED PHYSICS，vol.55，(7)，Article Number:07KC02，2016.07

  5. Extraction of all propagation constants in a specified region from the transcendental equation of a dispersion relation using the Sakurai–Sugiura projection method

    Shingo Sato, Takao Shimada, and Koji Hasegawa，Journal of the Optical Society of America A，vol.32，(7)，(p.1216 ～ 1221)，2015.06

  6. Efficient finite-difference time-domain computation of resonant frequencies of rectangular Lamé mode resonators via a combination of the symmetry boundary conditions and the Padé approximation

    Takashi Yasui, Koji Hasegawa, and Koichi Hirayama，Japanese Journal of Applied Physics，vol.54，(7)，(p.07HD01-1 07HD04-6 ～ )，2015.06

  7. A HYBRID TREFFTZ FINITE ELEMENT ANALYSIS OF SYMMETRIC OR ANTISYMMETRIC EIGENMODES PROPAGATING IN AN ELECTROMAGNETIC WAVEGUIDE

    森田，佐藤，長谷川，嶋田，日本計算数理工学会論文集，vol.14，(p.49 ～ 54)，2014.12

  8. HYBRID TREFFTZ FINITE ELEMENT ANALYSIS OF DEGENERATE MODES PROPAGATING IN AN ELECTROMAGNETIC WAVEGUIDE

    森田，佐藤，長谷川，嶋田，日本計算数理工学会，vol.13，2013.12

  9. Implementation of Free Surface Condition for Finite-Difference Time-Domain Method with a Staggered Grid with the Collocated Grid Points of Velocities

    T. Yasui, K.Hasegawa and K.Hirayama，Japanese Journal of Applied Physics，vol.52，(p.07HD07 ～ )，2013.07

  10. Perfectly Matched Layers for Elastic Waves in Piezoelectric Solids

    K. Hasegawa and S. Sato，Japanese Journal of Applied Physics，vol.52，(p.07HB01 ～ )，2013.07

  11. 電磁波導波路非線形固有値問題の解の判別法（線形化問題の固有値あるいは固有値の感度を用いる方法）

    佐藤慎悟，森田好人、長谷川弘治、嶋田賢男，計算数理工学論文集，vol.１２，(１)，2012.12

  12. A staggered grid with collocated grid points of velocities for modeling propagation of elastic waves in anisotropic solids with the finite-difference time domain method

    K.Hasegawa　and T.Shimada，Japanese Journal of Applied Physics，vol.51，(7)，(p.07GB04 ～ )，2012.07

  13. 電磁波導波路固有値問題のSakurai-Sugiura射影法を用いたハイブリッドトレフツ有限要素解法への混入解

    嶋田賢男，森田好人，長谷川弘治，佐藤慎悟，Transactions of the Japan society for Computational Methods in Engineering，vol.１１，(1)，(p.01 ～ 111216)，2011.12

  14. 二重周期構造による平面波散乱特性の三次元ハイブリッドトレフツ有限要素解析法

    佐藤慎悟　長谷川弘治 平山浩一，IEICE transactions on electronics，vol.J94-C，(10)，(p.277 ～ 287)，2011.10

  15. An analysis of reflection powers from a perfectly matched layer for elastic waves in the frequency domain finite element model

    T.Shimada， K.Hasegawa　and S.Sato，Japanese Journal of applied physics，vol.50，(7)，(p.07HC13 ～ )，2011.07

  16. 開放型電磁波導波路固有値問題のSakurai-Sugiura射影法を用いたハイブリッド・トレフツ有限要素解析法

    森田好人，嶋田賢男，長谷川弘治，佐藤慎悟，Transactions of the Japan society for Computational Methods in Engineering，vol.10，(1)，(p.16 ～ 101210)，2010.12

  17. Perfectly matched layers in the cylindrical and spherical coordinates for elastic waves in solids

    T.Shimada and K.Hasegawa，Japanese Journal of applied physics，vol.49，(No.7 issue 2)，(p.07HB08(3) ～ )，2010.07

  18. Perfectly Matched Layers for Elastic Waves

    嶋田賢男，長谷川弘治，IEICE transactions on electronics，vol.J93-C，(7)，(p.215 ～ 223)，2010.07

  19. 有限要素法における完全整合層の平面電磁波吸収特性

    嶋田賢男，長谷川弘治，佐藤慎悟，Transactions of the Japan society for Computational Methods in Engineering，vol.9，(1)，(p.19 ～ 24)，2009.12

  20. Finite element analysis of plane wave scattering of multilayered periodic structures

    佐藤慎悟　長谷川弘治，Transactions of the Japan society for Computational Methods in Engineering，vol.7，(2)，(p.219 ～ 224)，2008.12

  21. 3次元入射する平面波の回折格子散乱特性のハイブリッド・トレフツ有限要素法解析

    佐藤慎悟　長谷川弘治，IEICE transactions on electronics，vol.J89-C，(1)，(p.1 ～ 10)，2006.01

  22. preparation of piezoelectric ceramic thin films and their applications to GHz-band surface acousticwave devices

    H.Okano, K.Hasegawa, B.Ben-Nissan and O.C.Standard，Journal of Australasian Ceramics Society，vol.42，(2)，(p.14 ～ 20)，2006

  23. Analysis of scattering characteristics of diffraction gratings using hybrid Trefftz finite element method

    S.Sato and K.Hasegawa，International Journal of microwave and optical technology，vol.1，(2)，2006

  24. 多層格子による平面波散乱特性のハイブリッド・トレフツ有限要素法解析

    佐藤慎悟　長谷川弘治，計算数理工学論文集，vol.5，(2)，(p.113 ～ 118)，2005.12

  25. Propagation characteristics of surface acoustic waves on K3Li2Nb5O15

    K.Hasgawa, Y.Ikeda and H.Okano，Japanese Journal of applied physics，vol.44，(6B)，(p.4539 ～ 4543)，2005.06

  26. Scattering characteristics analysis of diffraction grating using hybrid trefftz finite element method

    佐藤慎悟　長谷川弘治，Transactions of the JASCOME Journal of boundary element methods，vol.21，(p.53 ～ 58)，2004.12

  27. The temperature coefficient of frequency and quality factors at resonance and antiresonance frequencies of infinite interdigital transducers for leaky surface acoustic waves on a SiO2/IDT/36° Y-X LiTaO3 substrate

    K.Hasegawa and M.Sakuma，Japanese Journal of applied physics，vol.43，(7A)，(p.4398 ～ 4403)，2004.07

  28. イオンプレーティング法による窒化アルミニウム薄膜の作製

    岡野寛,増田知弘,道久明宏,長谷川弘治，真空，vol.47，(6)，(p.452 ～ 456)，2004.06

  29. Coupled-mode equations for interdigital transducers for leaky surface acoustic waves

    Koji Hasegawa and MasanoriKoshiba，Japanese Journal of applied physics，vol.42，(5B)，(p.3157 ～ 3160)，2003.05

  30. 電子ビーム蒸着法によるニオブ酸カリウム薄膜の作製

    岡野寛,岡田光孝，宮脇功磨,中村茂昭,長谷川弘治，真空，vol.46，(3)，(p.269 ～ 271)，2003.03

  31. Parameters of coupled-mode equations for a natural-single-phase- unidirectional transducer on a La3Ga5.5Ta0.5O14 substrate

    W.Tyua and K.Hasegawa，Japanese Journal of applied physics，vol.41，(5B)，(p.3469 ～ 3472)，2002.05

  32. Coefficients of coupled-mode equations for interdigital transducers with solid-electrodes ofgold, silver, tantalum, or tungsten alloy on a 50°Y-25°X La3Ga5SiO14 substrate

    K.Hasegawa, K.Inagawa and M.Koshiba，Japanese Journal of applied physics，vol.41，(5B)，(p.3473 ～ 3475)，2002.05

  33. Study of electrode materials effect on NSPUDT properties of Langasite

    S.Wang, R.Kimura,K.Yamaguchi, J.Harada, S.Uda andK.Hasegawa，Japanese Journal of applied physics，vol.40，(9B)，(p.5710 ～ 5714)，2001.09

  34. Extraction of all the coefficients of coupled-mode equations for natural-single-phase-unidirectional SAW transducers from dispersion characteristics computed by hybrid finite element method

    K. Hasegawa, K. Inagawa and M. Koshiba，IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control，vol.UFFC-48，(4)，(p.1341 ～ 1350)，2001.09

  35. An analysis of EWD-RDT on a La3Ga5.5Nb0.5O14 substrate

    K. Inagawa , K. Hasegawa, and M. Koshiba，Japanese Journal of applied physics，vol.40，(5B)，(p.3747 ～ 3750)，2001.05

  36. Coefficients of coupled-mode equations for reversal of directivity transducers on a 50ヒ唳-25ヒ唸 La3Ga5SiO14 substrate

    K.Hasegawa, K.Inagawa and M.Koshiba，Japanese Journal of applied physics，vol.40，(5B)，(p.3751 ～ 3754)，2001.05

  37. 周期が１波長である周期構造弾性表面波導波路のハイブリッド有限要素法解析

    長谷川弘治, 小柴正則，IEICE transactions on electronics，vol.J83-C，(10)，(p.954 ～ 962)，2000.10

  38. Coefficients of coupled-mode equations for a natural-single-phase-unidirectional transducer and an electrode-width-difference-reversal-of-directivity transducer on a 50ヒ唳-24ヒ唸 La3Ga5SiO14 substrate

    K.Hasegawa, K.Inagawa and M.Koshiba，Japanese Journal of applied physics，vol.39，(5B)，(p.3020 ～ 3023)，2000.05

  39. Parameters of coupling-of-modes equations for NSPUDT on a La3Ga5.5Nb0.5O14 substrate

    K.Inagawa, K.Hasegawa and M.Koshiba，Japanese Journal of applied physics，vol.39，(5B)，(p.3014 ～ 3019)，2000.05

  40. 基板の異方性を用いた１方向性弾性表面波用すだれ状電極のモード結合方程式

    長谷川弘治,稲川清, 小柴正則，IEICE transactions on electronics，vol.J82-C-I，(12)，(p.735 ～ 743)，1999.12

  41. Parameters in coupling-of-modes equations for a natural single-phase unidirectional transducer and a transduction center shift reversal of directivity transducer on a La3Ga5SiO14 substrate

    K.Inagawa, K.Hasegawa and M.Koshiba，Japanese Journal of applied physics，vol.38，(5B)，(p.3248 ～ 3253)，1999.05

  42. An analysis of periodicleaky surface acoustic waveguides using the hybrid finite-element method

    K.Hasegawa and M.Koshiba，Japanese Journal of applied physics，vol.37，(5B)，(p.2901 ～ 2904)，1998.05

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