%0 Journal Article %A F. Ruesink %A H. M. Doeleman %A R. Hendrikx %A A. F. Koenderink %A E. Verhagen %B Physical Review Letters %D 2015 %G eng %N 20 %P 203904 %R 10.1103/PhysRevLett.115.203904 %T Perturbing Open Cavities: Anomalous Resonance Frequency Shifts in a Hybrid Cavity-Nanoantenna System %V 115