A Novel Plasmonic Nanoantenna for Cancer Sensor Applications

Plasmonic nanoantennas are powerful tools for enhancing electromagnetic fields at the nanoscale, offering promising perspectives in Terahertz biosensing. This work introduces a novel Fractal V-Fork nanoantenna, specifically engineered for the detection of cancer biomarkers in the 1–10 THz range. The structure, composed of gold on a silicon substrate, features a fractal-inspired V-shaped geometry with internal openings that improve both field confinement and absorption at resonance. Electromagnetic simulations reveal four distinct resonances at 1.29, 3.05, 3.82, and 5.10 THz, with absorption peaks reaching -37 dB. The single nanoantenna achieves a sensitivity of 240 GHz/RIU, further enhanced in a 2×2 array configuration. The device is fabricated using Electron Beam Lithography, enabling high-resolution patterning. Thanks to its multiband response and sensitivity, the Fractal V-Fork nanoantenna represents a promising candidate for next-generation THz biosensing platforms aimed at early-stage cancer diagnostics.