Metamaterial with a negative refractive index for real-time terahertz imaging with sub-wavelength resolution

2017 Fiscal Year Final Research Report

• Project/Area Number: 26706017
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Optical engineering, Photon science
• Research Institution: Tokyo University of Agriculture and Technology (2017); Ibaraki University (2014-2016)
• Principal Investigator: Suzuki Takehito 東京農工大学, 工学(系)研究科(研究院), 准教授 (60550506)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: テラヘルツ波帯 / メタマテリアル / 負の屈折率 / ゼロ屈折率 / 高屈折率 / 超高屈折率

Outline of Final Research Achievements

We demonstrate a negative refractive index metamaterial with high transmission, low reflection, and low loss in the terahertz waveband. The metamaterial with a negative refractive index consists of　asymmetrically aligned paired cut metal wires on the front and back of a dielectric substrate. A cyclo-olefin polymer film with copper layers on the front and back is etched. Measurements by terahertz time-domain spectroscopy (THz-TDS) demonstrate a metamaterial with a negative refractive index of -4.2+j0.17, high transmitted power of 81.5%, low reflected power of 4.3%, and a high figure of merit (FOM) of 24.2 at 0.42 THz.

Free Research Field

応用物理学・工学