Design of ultra-compact triplexer with function-expansion based topology optimization Z Zhang, Y Tsuji, T Yasui, K Hirayama Optics express 23 (4), 3937-3950, 2015 | 38 | 2015 |

A wide-angle finite element beam propagation method with perfectly matched layers for nonlinear optical waveguides T Yasui, M Koshiba, Y Tsuji Journal of lightwave technology 17 (10), 1909, 1999 | 35 | 1999 |

Design of three-dimensional optical circuit devices by using topology optimization method with function-expansion-based refractive index distribution T Yasui, Y Tsuji, J Sugisaka, K Hirayama Journal of lightwave technology 31 (23), 3765-3770, 2013 | 29 | 2013 |

Topology optimization of optical waveguide devices based on beam propagation method with sensitivity analysis A Iguchi, Y Tsuji, T Yasui, K Hirayama Journal of Lightwave Technology 34 (18), 4214-4220, 2016 | 24 | 2016 |

Efficient topology optimization of optical waveguide devices utilizing semi-vectorial finite-difference beam propagation method A Iguchi, Y Tsuji, T Yasui, K Hirayama Optics Express 25 (23), 28210-28222, 2017 | 23 | 2017 |

A study on topology optimization of optical circuits consisting of multi-materials K Fujimoto, Y Tsuji, K Hirayama, T Yasui, S Sato, R Kijima Journal of lightwave technology 30 (13), 2210-2215, 2012 | 16 | 2012 |

Implementation of free-surface condition for finite-difference time-domain method using a staggered grid with the collocated grid points of velocities T Yasui, K Hasegawa, K Hirayama Japanese Journal of Applied Physics 52 (7S), 07HD07, 2013 | 15 | 2013 |

A study on optimization of waveguide dispersion property using function expansion based topology optimization method H Goto, Y Tsuji, T Yasui, K Hirayama IEICE Transactions on Electronics 97 (7), 670-676, 2014 | 12 | 2014 |

Three-dimensional vector beam-propagation method for second harmonic generation analysis T Yasui, M Koshiba Journal of lightwave technology 19 (5), 780, 2001 | 12 | 2001 |

Topology optimal design for optical waveguides using time domain beam propagation method A Iguchi, Y Tsuji, T Yasui, K Hirayama IEICE Electronics Express 15 (11), 20180417-20180417, 2018 | 10 | 2018 |

Synthesis of one-input M-output optical FIR lattice circuits K Jinguji, T Yasui Journal of lightwave technology 26 (7), 853-866, 2008 | 10 | 2008 |

Expansion of the difference-field boundary element method for numerical analyses of various local defects in periodic surface-relief structures J Sugisaka, T Yasui, K Hirayama JOSA A 32 (5), 751-763, 2015 | 9 | 2015 |

Efficient shape and topology optimization based on sensitivity analysis for optical waveguide devices utilizing full-vectorial BPM A Iguchi, Y Tsuji, T Yasui, K Hirayama Journal of Lightwave Technology 38 (8), 2328-2335, 2020 | 8 | 2020 |

Efficient finite-difference time-domain computation of resonant frequencies of rectangular Lamé mode resonators via a combination of the symmetry boundary conditions and the … T Yasui, K Hasegawa, K Hirayama Japanese Journal of Applied Physics 54 (7S1), 07HD04, 2015 | 8 | 2015 |

Design algorithm for multichannel interleave filters K Jinguji, T Yasui Journal of lightwave technology 25 (8), 2268-2276, 2007 | 8 | 2007 |

Fast actual-size vectorial simulation of concave diffraction gratings with structural randomness J Sugisaka, T Yasui, K Hirayama JOSA A 34 (12), 2157-2164, 2017 | 6 | 2017 |

Synthesis of 1-input 3-output lattice-form optical delay-line circuit S Azam, T Yasui, K Jinguji IEICE transactions on electronics 90 (1), 149-156, 2007 | 6 | 2007 |

Finite element beam propagation method for nonlinear optical waveguides T Yasui, M Koshiba, A Niiyama, Y Tsuji Electronics and Communications in Japan (Part II: Electronics) 82 (4), 47-53, 1999 | 6 | 1999 |

Synthesis algorithm of a multi-channel lattice-form optical delay-line circuit S Azam, T Yasui, K Jinguji Optik 121 (12), 1075-1083, 2010 | 5 | 2010 |

Efficient analysis of diffraction grating with 10000 random grooves by difference-field boundary element method J Sugisaka, T Yasui, K Hirayama IEICE Transactions on Electronics 100 (1), 27-36, 2017 | 4 | 2017 |