High-Sensitivity Sensor in Localized Plasmonic Hybrid Resonator
Computer and Electronic Information College, Guizhou Qiannan University of Science and Technology, Huishui 550600, China
| Abstract: | Surface Plasmon Polaritons (SPP) are hybrid electromagnetic modes generated by the strong coupling of electromagnetic oscillations and electronic oscillations in metals. However, in the microwave and terahertz bands, due to the weakened skin effect of metals and the reduced effective electrical conductivity, they are difficult to be directly excited. Localized Spoof Surface Plasmonic (LSSP), as a functional material that achieves electromagnetic characteristics similar to SPP in this frequency band, has unique advantages such as deep wavelength compression and high sensitivity. This thesis focuses on the research of tunable LSSP devices. Based on the strong dispersion and high field restraint of LSSP, a microwave sensor with high sensitivity and high Figures of Merit (FOM) is designed. When the dielectric constant of the measured medium varies from 2 to 4, the dipole mode frequency shifts up to 270 MHz. With a sensitivity of 135 MHz/RIU, after introducing a crack, the FOM value of the dipole mode increased by approximately 4.4% while maintaining the sensitivity, and the excitation efficiency improved by 22%. The LSSP composite resonator, with its ultra-compact effective wavelength, low-cost manufacturing process and high Quality Factor (Q), has great application potential in microwave non-destructive testing fields such as micro-biomedicine and chemical sensing, achieving precise regulation of the electromagnetic characteristics of local artificial plasmons. |
| Keywords: | Ferroelectric Composite Resonator; LSSP; Dielectric Properties; High-sensitivity Sensor; FOM |
| DOI: | 10.57237/j.cst.2025.04.004 |
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Received: 27 October 2025
Accepted: 11 December 2025
Published Online: 24 December 2025
Funding
| 1. | 贵州省高等学校本科教学内容和课程体系改革项目 (GZJG2024456) |
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