Plasmonic Nanoshell Antennas for Enhanced Sensing Bio‐Labeling

$SiO2$ core, Au shell nanoparticles are employed as plasmonic nanoantennas for enhanced sensing bio‐labeling. Electrodynamics calculations show that strong absorption and emission enhancements are obtained in a wide spectral range, suitable for a large variety of commonly employed bio‐labels. Furthermore, the shell geometry is able to provide high bio‐compatibility by embedding the labels in the inner cavity.