IEICE TRANSACTIONS ON ELECTRONICS E103C(11) 560-566 2020年11月 [査読有り]
In this paper, we reformulate a sensitivity analysis method for function-expansion-based topology optimization method without using gray area. In the conventional approach based on function expansion method, permittivity distribution contains gray...
This paper presents structural optimization based on sensitivity analysis exploiting a bi-directional beam propagation method (Bi-BPM) to design efficiently passive components in high-index-contrast optical waveguides. In this study, the Bi-BPM ba...
A new efficient boundary condition of finite element method (FEM) by using propagation operator is proposed. In this method, input, and output ports are terminated on their own boundaries instead of using perfectly matched layer (PML) which requir...
IEEE JOURNAL OF QUANTUM ELECTRONICS 55(4) 2019年8月 [査読有り]
We apply an analysis scheme combining propagation operator method (POM) and beam propagation method (BPM) to waveguide discontinuity problems. In this approach, finite element method (FEM) with higher adaptability to waveguide geometry is utilized...
Koyo Mori Keita Morimoto Tomohiro Tanaka Akito Iguchi Yasuhide Tsuji
OPTICS COMMUNICATIONS 439 290-294 2019年5月 [査読有り]
A signal output of optical devices with multi-input ports, such as a logic gate, depends on the phase difference between input ports. In order to cascade optical devices, it is essential to design such devices considering not only desired output p...
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工学研究科