Plasmonic Fabry-Perot cavity as platform to build nano-optical filters and sensors

This work deals with the nano-optical version of a Fabry-Perot cavity. By exciting plasmon modes on the metallic nanoparticles in the cavity, optical power can be squeezed into subwavelength scale without scattering effects stemmed from diffraction. As suggested by our results, it surges feasible to use such structure as a building block for optical resonators at nanometer dimensions. Furthermore, the enhanced near-field provided by the plasmon modes yields a high-sensitive ultra-compact area, which meets potential applications for biochemical sensing.