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