Optimal Aspect Ratio and Excitation Spectral Region of LSPR Sensors Using Individual Au Dimmeric Nanoplates

AbstractBoth the excitation wavelength and aspect ratioAR are key parameters controlling the refractive index sensitivity performances of plasmonic sensors of individual Au nanoplate dimmers. In this work, the refractive index sensitivity factorS and figure of meritFOM of individual Au dimmeric nanoplate sensors with different plate cross-sections were investigated numerically as functions ofAR and their resonant wavelength of dipolar localized surface plasmons. Their optimalFOM and corresponding optimalAR and excitation spectral region for plasmonic sensing are predicted simultaneously. The effects of the plate cross-section shape and near-filed coupling between components within each dimmer onS andFOM are also discussed. The present work holds great promise for choosing componentAR and excitation wavelength for Au dimmeric nanoplate applications in optical sensing and detection.
Source: Plasmonics - Category: Biomedical Science Source Type: research