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Dielectric Properties of Ba 0.7 Sr 0.3 TiO 3 Film at Terahertz Measured by Metamaterials
Author(s) -
Qi Peng,
Fan Yuancheng,
Li Hongqiang,
Zhang Qiwei,
Zhai Jiwei
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05072.x
Subject(s) - materials science , metamaterial , terahertz radiation , dielectric , split ring resonator , optoelectronics , thin film , resonator , ferroelectricity , resonance (particle physics) , optics , nanotechnology , physics , particle physics
A metamaterial device with resonance frequency at THz was reported in this article. The device was composed of split‐ring resonators ( SRR ), ferroelectric Ba 0.7 Sr 0.3 TiO 3 ( BST 70) film, and alumina substrates. The SRR of 140 nm thick Au/Ti was fabricated on BST 70 film with periodicity of 50 μm, width of 10 μm, and gap of 8 μm. The BST 70 thin film was deposited on alumina substrates using a sol–gel technique. Terahertz time domain spectroscopy was used to characterize electromagnetic response of the metamaterial at various temperatures. Finite difference time domain was used to simulate the transmission spectra of the metamaterial at THz frequencies. Dielectric constant of the BST 70 film at THz, in the temperature range from 0°C to 100°C, was derived by comparing the simulated resonance frequency with the experimental curves.