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Controlling the near field optical binding force can be a key factor forparticle clustering, aggregation and localized surface plasmon sensors. So farthere is no generic way to reverse the near field optical binding force forplasmonic or dielectric nano-dimers of distinct shapes (cube, cylinder, ring,sphere). In this article, for both plasmonic and dielectric objects, we havedemonstrated a general way to control the reversal of near field binding forcefor different shaped dimer sets. The force reversal is achieved by simplebreaking of symmetry, considering the nano particles are half or less than halfimmersed in an inhomogeneous dielectric background, i.e. at air-waterinterface. Such reversals have been explained based on Fano resonance,interference fields, unusual behavior of optical Lorentz force and image chargetheory. However, if the dimer set is placed over a dielectric interface orfully inside a homogeneous medium, the sign of binding force does not reverse.Our proposed configuration provides a generic mechanism of archiving bindingforce reversal for both plasmonic and dielectric objects, which can be verifiedby very simple experimental set-up.

A General Way to Control the Reversal of Near Field Optical Binding Force between Plasmonic or Dielectric Dimers