jannatul nayem
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https://www.researchgate.net/publication/279215399_Graphene_Enhances_the_Sensitivity_of_Fiber-Optic_Surface_Plasmon_Resonance_Biosensor

in the paper sayes collimated source.i am not understanding where to put it..i have posted some pictures below.

I am very new to lumerical fdtd.please correct me if i am wrong.