Plasmonic Waveguide with Spoof Localized Plasmon Polariton based Resonator for Biosensing Applications

A novel narrowband dielectric-based spoof localized plasmon polariton (DSLPP) with plasmonic waveguide sensor has been developed for biosensing applications. This sensor exhibits a narrowband response with good sensitivity and high-quality factor, characterized by resonances at 6.1 GHz and 8.2 GHz. The designed plasmonic sensor consists of coplanar waveguide (CPW) and plasmonic waveguide with a sandwiched resonator (SR). With the integration of plasmon waveguide and SR, a fundamental mode with high quality factor and multiple higher order modes are observed from the transmission coefficient spectrum. The proposed sensor is versatile and can be employed for detecting various diseases, including cancer and malaria, as well as for analyzing edible oils and other chemicals. Key advantages of this sensor include its simple design, tunability, narrow sensitive bandwidth, and high sensitivity. Moreover, it achieves very high-quality factor (Q) values for band I it is 1105.86 and band II, 1177.69, good sensitivity for band I it is 58 $\mathbf{M H z} / \varepsilon_r$ and for band II it is 114 $\mathbf{M H z} / \varepsilon_r$, with the linearity $\mathbf{R}^2{=}$ 0.9786, 0.9873 respectively, making it an excellent candidate for precise and reliable detection in diverse biosensing and chemical sensing applications.