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About optical force calculation of particles manipulated by microring resonator

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Hi,everyone.

I want to simulate a structure which includes two bus waveguides and one microring resonator to form an on-chip optical tweezer. One microparticle is placed in the gap area between one waveguide and the resonator.

The structure is quite similar with:
pubs.acs.org/doi/abs/10.1021/nl100501d
(work from Kenneth Crozier, School of Engineering and Applied Sciences, Harvard University)

I want to use the Maxwell Stress Tensor method to calculate the optical force on it.

I tried the following:
In Results-Derived values. I added a surface integration for the whole surface of this ball-shaped particles. However, I am not sure how the expression of the force is.

If you have some ideas about optical force calculation, please feel free to discuss with me.

Thank you so much.

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