Thin-film sensing with planar terahertz metamaterials: sensitivity and limitations

作者：John F. O’Hara, Ranjan Singh, Igal Brener, E. I. Smirnova, Jiaguang Han, Antoinette J. Taylor, Weili Zhang · 发表于：Optics Express · 年份：2008 · DOI：10.1364/oe.16.001786 · 被引用次数：518 · 研究领域：Terahertz technology and applications、Metamaterials and Metasurfaces Applications、Microwave Engineering and Waveguides

The limiting effects of varying the thickness of a dielectric overlayer on planar double split-ring resonator (SRR) arrays are studied by terahertz time-domain spectroscopy. Uniform dielectric overlayers from 100 nm to 16 mum thick are deposited onto fixed SRR arrays in order to shift the resonance frequency of the electric response. We discuss the bounds of resonance shifting and emphasize the resulting limitations for SRR-based sensing. These results are presented in the context of typical biosensing situations and are compared to previous work and other existing sensing platforms.