Figure 10

Plasmonic nanoantennas coupled to microcavities enhance sensitivity in biodetection. (A) A molecule binding to a plasmonic nanoantenna coupled to a WGM microcavity experiences field strengths that are enhanced in proportion to $E2/E02$, boosting the frequency shift upon binding [147]. (B) Up to three orders of sensitivity enhancement has been predicted for protein detection with a nanorod coupled to a toroidal cavity, reprinted with permission from [58], copyright (2011), American Institute of Physics.