Establishment of nonreciprocal coordinate transformation medium

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K18810
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 21:Electrical and electronic engineering and related fields
• Research Institution: Osaka University
• Principal Investigator: Sanada Atsushi 大阪大学, 大学院基礎工学研究科, 教授 (20264905)
• Project Period (FY): 2022-06-30 – 2024-03-31
• Keywords: メタマテリアル / 変換電磁気学 / 透明マント / 非相反

Outline of Final Research Achievements

In this study, a nonreciprocal coordinate transformation medium which gives different independent coordinate systems depending on the propagation direction is proposed and a nonreciprocal cloak operation based on the proposed medium are numerically confirmed. First, a nonreciprocal lumped element model composed of multiple gyrators is proposed, and a circuit topology of a nonreciprocal two-dimensional anisotropic medium based on the proposed nonreciprocal lumped elements is devised. Then, a carpet cloak with the proposed two-dimensional nonrelativistic anisotropic medium is designed, and it is numerically confirmed that the nonreciprocal cloak has nonreciprocal behavior in which the incident beam with the incident angle of 45 deg has a specular reflection without bump, whereas an incident beam with the incident angle of -45 deg has scattering due to a bump.

Free Research Field

メタマテリアル

Academic Significance and Societal Importance of the Research Achievements

本研究は、これまで手法が確立されていない 2 次元非相反座標変換媒質の実現可能性を探るという点で挑戦的であり、変換電磁気学の新たな分野を開拓するものである。さらに本研究は、理論的・学術的な貢献のみならず、光学領域や電波領域において、相手から探知されないがこちらから探知できるような画期的な非相反性レーダ技術や、新たな無線通信技術等への応用可能性があり、工学応用的にも重要性は高く、社会変革をもたらす可能性がある。