A metal-to-insulator transition in cut-wire-grid metamaterials in the terahertz region

作者：Takano Keisuke^*; Shibuya Kyoji; Akiyama Koichi; Nagashima Takeshi; Miyamaru Fumiaki; Hangyo Masanori

来源：Journal of Applied Physics, 2010, 107(2): 024907.

DOI：10.1063/1.3284958

• finite difference time-domain analysis
• metal-insulator transition
• metamaterials
• microwave materials
• permittivity
• plasmons

Metamaterials with metallic wire-gird structures support extremely low frequency plasmons and their electromagnetic responses exhibit metallic characteristics described by the Drude model. In this paper, we have investigated the electromagnetic responses of the wire-grid structures in the terahertz frequency range when periodic and random cuts are introduced in the wires. It is found experimentally that the wire-grid structures exhibit a transition from a metallic response of negative permittivity to an insulators-like response of large positive permittivity at terahertz frequencies when small cuts are introduced in the wires. It is also revealed from the finite-difference time-domain simulation that such a transition is accompanied by an enhancement of the electric fields in the cuts, which is applicable to practical technologies.

• 出版日期2010-1-15