Development of Multi-Objective Topology Optimization for Photonic Devices with Desired Properies

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04169
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: Muroran Institute of Technology
• Principal Investigator: Tsuji Yasuhide 室蘭工業大学, 大学院工学研究科, 教授 (70285518)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 光導波路デバイス / トポロジー最適設計 / 有限要素法 / ビーム伝搬法 / 随伴変数法 / 関数展開法

Outline of Final Research Achievements

In order to design high-performance optical devices using computer simulation without relying on the designer's knowledge, an automatic topology optimization method have been investigated. We developed a new method using metaballs and mosaic-like structures to represent structures in the design region, and showed that this method can achieve the target characteristics and obtain device structures suitable for fabrication. Numerical analysis methods were also investigated to improve design efficiency, and it was shown that the improved equivalent effective index method can significantly improve the efficiency of 3D design. We also proposed a hybrid method of Harmony Search and Gradient Method as an algorithm to optimal solution search, and showed that it is more efficient than previous methods for a relatively large number of problems. Based on these results, we have found various new optical devices.

Free Research Field

電子工学，光・波動エレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

光デバイスは通信分野のみならずバイオセンシングをはじめ様々な分野で応用が広がっている．そうした様々な分野からの様々な要求に応えられる高性能な光デバイスを時期を逸することなく設計できることが求められている．開発した光デバイスのトポロジー最適設計法は，設計者の知識を必要とすることなく目的の特性を与えるだけでそれを実現し作製にも適した素子を自動設計することができる．これにより光を利用した技術の進展が加速することが期待される．また，トポロジー最適設計法でまったく新しい構造が自動生成されることで，これまで我々が考えてこなかった物理や，素子特性を改善するための技術を知ることができる．