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<p>Hybrid plasmonic configurations provide an efficient and straightforward framework for achieving high-sensitivity and miniaturized optical sensing. Electromagnetic fields at terahertz frequencies open the window to multiple optical applications such as optical sensing, wireless communication, and medical imaging. The present research explores the performance of a terahertz refractive index (RI) sensor employing the finite element method (FEM) for numerical analysis. The proposed sensor is investigated based on coupling mechanism between a metal–insulator–metal (MIM) waveguide and a porous silicon (pSi) disk resonator. The coupling mechanism induces a sharp and asymmetric Fano resonance profile with significant enhancement in transmission value. The maximum sensing performance can be achieved by manipulating structure parameters and disk porosity. Simulation results reveal that the resulting Fano resonance exhibits an approximately linear dependence on the index of the surrounding index environment. Through optimization, the design exhibited outstanding sensing capabilities, with sensitivity reaching 1433&#xa0;nm/RIU, a figure of merit of 392.06 RIU⁻¹, and quality factor of 5706.35. The study demonstrates that this design approach can effectively generate compact sensor architectures with high performance for microscale RI detection.</p>

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High Performance Terahertz Sensor Structure Based on Coupled MIM Waveguide–Disk Resonator Structure

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Zeinelabedin A. Mohamed

摘要

Hybrid plasmonic configurations provide an efficient and straightforward framework for achieving high-sensitivity and miniaturized optical sensing. Electromagnetic fields at terahertz frequencies open the window to multiple optical applications such as optical sensing, wireless communication, and medical imaging. The present research explores the performance of a terahertz refractive index (RI) sensor employing the finite element method (FEM) for numerical analysis. The proposed sensor is investigated based on coupling mechanism between a metal–insulator–metal (MIM) waveguide and a porous silicon (pSi) disk resonator. The coupling mechanism induces a sharp and asymmetric Fano resonance profile with significant enhancement in transmission value. The maximum sensing performance can be achieved by manipulating structure parameters and disk porosity. Simulation results reveal that the resulting Fano resonance exhibits an approximately linear dependence on the index of the surrounding index environment. Through optimization, the design exhibited outstanding sensing capabilities, with sensitivity reaching 1433 nm/RIU, a figure of merit of 392.06 RIU⁻¹, and quality factor of 5706.35. The study demonstrates that this design approach can effectively generate compact sensor architectures with high performance for microscale RI detection.