Magnetic control of particle trapping in a hybrid plasmonic nanopore

Plasmonic nanopores are extensively investigated as single molecules detectors. The main limitations in plasmonic nanopore technology the too fast translocation velocity of molecule through pore and consequent very short analysis times, well possible instabilities due to local heating. most interesting approach control enable longer acquisition times is represented by ability efficiently trap tune motion nanoparticles that can be used tag molecules. Here, we theoretically investigate performance a magneto-plasmonic prepared with thin layer cobalt sandwiched between two gold layers. A then coupled translocating magnetic nanoparticle. By setting configuration around an external field, it generate nanoscale tweezer nanoparticle at specific point. Considering 10 nm magnetite calculate trapping force up 28 pN, order magnitude above obtained standard optical or approaches. Moreover, pulls close contact nanopore's wall, thus enabling formation nanocavity enclosing deeply sub-wavelength confined electromagnetic field average intensity enhancement 230 near-infrared wavelengths. presented hybrid system points towards strategy improve nanopore-based biosensors for single-molecule detection potentially various biomolecules.