2026. A Critical Study of Nanostructured Gold and Silver Plasmonic Devices with Ultra-Sensitive Localized Surface Plasmon Resonance for Biosensing Applications. Journal of Science Innovations and Nature of Earth. 6, 2 (May 2026), 04–08. DOI:https://doi.org/10.59436/jsiane.v6i2.2.2583-2093.