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We investigate the feasibility of CMOS-compatible optical structures todevelop novel integrated spectroscopy systems. We show that local fieldenhancement is achievable utilizing dimers of plasmonic nanospheres that can beassembled from colloidal solutions on top of a CMOS-compatible opticalwaveguide. The resonant dimer nanoantennas are excited by modes guided in theintegrated silicon nitride waveguide. Simulations show that 100 fold electricfield enhancement builds up in the dimer gap as compared to the waveguideevanescent field amplitude at the same location. We investigate how the fieldenhancement depends on dimer location, orientation, distance and excitedwaveguide modes.

Electric field enhancement with plasmonic colloidal nanoantennas excited by a silicon nitride waveguide