Design and Measurement of Spoof Plasmon Resonators for Microwave Index Sensing
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- Design and Measurement of Spoof Plasmon Resonators for Microwave Index Sensing
- Lim, Yeon Soo
- Jun, Young Chul
- Issue Date
- Graduate School of UNIST
- Surface plasmons (SP) are generated by the interaction between electromagnetic (EM) waves and conduction electrons on the surface of conductive materials. SPs are usually observed in the optical or near-infrared region. On the other hand, in the lower frequency regime such as microwave or terahertz range, SP modes do not exist because the field cannot penetrate into metals. To overcome this limitation, metamaterials based on corrugated metal patterns were introduced, which are called spoof SPs. Spoof SPs show similar properties to optical SPs. Especially, spoof localized SPs (LSPs) can confine EM waves near compact resonant structures (like LSPs in metal nanoparticles), and they can be applied to sensing. In this thesis, we report on the fabrication of spoof LSPs on a photopaper using inkjet printing and conduct the microwave measurements of spoof LSP resonances. In addition, we show the ability of spoof LSPs for microwave index sensing. In single or coupled resonator structures, we measure how the resonance frequencies and intensities change upon the index variation. We expect spoof LSP structures could be useful for IoT sensors because of simple and cheap fabrication and easily tunable resonance frequencies.
- Department of Materials Science and Engineering
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