2018/10/25 by Habib Ammari, Ammari, Habib, Alexander Dabrowski +5
Engineering · Materials Science · Physics and Astronomy · #Plasmonic and Surface Plasmon Research #Optical Coatings and Gratings #Electromagnetic Scattering and Analysis
paper · pdf · doi:10.48550/arxiv.1810.10772
This paper aims at providing a small-volume expansion framework for the scattering resonances of an open cavity perturbed by small particles. The induced shift of the scattering frequencies by the small particles is derived without neglecting the radiation effect. The formula holds for arbitrary-shaped particles. It shows a strong enhancement in the frequency shift in the case of plasmonic particles. The formula is used to image small particles located near the boundary of an open resonator which admits whispering-gallery modes. Numerical examples of interest for applications are presented.