Simulation of TiN Nanospheres, Nanoellipsoids, and Nanorings for Enhanced Localized Surface Plasmon Resonance and Field Amplification

Abstract This study investigates the plasmonic behavior of TiN nanostructures, specifically focusing on three geometries: nanospheres, nanoelliptical particles, and nanorings. The localized surface plasmon resonance (LSPR) of these structures is analyzed and compared with noble plasmonic materials to determine their potential in applications such as sensing, photothermal therapy, and energy harvesting. TiN nanospheres exhibit strong absorption and scattering in the visible to near‐infrared region, making them suitable for applications requiring high field enhancement. The optical absorption and scattering efficiencies were found to depend heavily on particle size and the surrounding medium's refractive index. Nanoelliptical particles offer tunability in their plasmonic response by adjusting their aspect ratio, allowing for enhanced field confinement and broader spectral coverage. This tunability makes them ideal for applications requiring precise control over resonance frequencies. Nanorings, with their unique hollow structure, demonstrate distinct plasmonic modes that are sensitive to both inner and outer diameters. These geometries enhance light‐matter interactions at their edges and enable further tuning of LSPR properties. The plasmonic field enhancement of TiN nanorings surpasses that of spherical and elliptical counterparts due to their larger surface area that are crucial for applications like biosensing and surface‐enhanced Raman spectroscopy (SERS). Overall, the versatility in geometry offers a range of tunable plasmonic properties for TiN nanostructures, paving the way for their use in next‐generation nanophotonic and sensing devices.