Thursday, April 13, 2017
Abstract-Dynamical thermal metamaterial response at terahertz frequencies
Zhi-Chao Ma, Zhi-Mou Xu, Chun-Ya Luo, Jing Peng, Ze-Ping Li, Shuang-Bao Wang
Utilizing terahertz time domain spectroscopy, we have characterized the electromagnetic response of a planar array of complementary square metal frames fabricated upon a high resistivity Si substrate, and between the two layers existed an important ferroelectric layer strontium titanate(STO). The resonance frequency dependent magnetic and electric resonances are in excellent agreement with theory. We demonstrate, it has two distinctive reflection dips through reconfigures the metamaterial by etched a rectangular stripe, and the former metamaterial has only one resonance frequency. Cooling the metamaterial from 400 K to 200 K causes excellent blue shift. The resonance shift is owing to the variation of the dielectric constant of the low-temperature co-fired ceramic (LTCC) substrate. Because of the universality of metamaterial response over many decades of frequency, these results have implications for other regions of the electromagnetic spectrum.