Research Works

This paper introduces a nanoscale plasmonic sensor with dual-function capabilities for detecting both pressure and flow rate, designed using a metal-insulator-metal (MIM) bus waveguide coupled with a resonator featuring a horizontal slot and multiple stubs. The sensor demonstrates high pressure sensitivity, achieving 1100.70 nm/MPa for pressure detection, with a Figure of Merit (FOM) of 4.6054, and effectively measures flow rates from 58.544 pL/s to 356.43 pL/s using an optical spectrum analyzer (OSA). Finite Element Method (FEM) simulations were employed to analyze the pressure-induced wavelength shifts, enhancing the sensor’s versatility in integrated sensing applications. The sensor’s compact footprint, simplicity, and ease of fabrication make it ideal for integration into lab-on-a-chip devices. Its dual functionality provides a novel solution for precise, real-time monitoring in biomedical and microfluidic engineering applications. 

This work introduces a CMOS-compatible H-shaped plasmonic sensor with a silicon–insulator–silicon (SIS) configuration, utilizing heavily doped n-type silicon as an alternative to traditional plasmonic materials like Ag and Au. By optimizing carrier concentrations, we tuned the permittivity to achieve negative real permittivity, enabling efficient Surface Plasmon Polariton (SPP) propagation. FEM simulations yielded a peak sensitivity of 5841.43 nm/RIU (FOM: 23.8426). The sensor also demonstrates temperature sensing (PDMS, ethanol), blood electrolyte detection (Na+, K+), chemical detection, and magnetic field sensing, showcasing the versatility of n-type silicon in plasmonic device applications. 

This paper presents a novel oxidation-resistant plasmonic MIM biosensor designed for real-time urea and glucose detection in urine, aiding in diabetes and kidney disease (DKD) diagnosis. The biosensor features a four-hand-shaped fan resonator with integrated nanodots and stubs, optimized via FEM simulations. It achieves a maximum sensitivity of 2470.48 nm/RIU (FOM: 50.15). The use of Au for oxidation resistance ensures chemical stability, making it a viable candidate for point-of-care DKD monitoring. By leveraging SPP interactions in MIM structures, the sensor enables real-time, highly sensitive biomarker detection for improved disease diagnostics.