scattering problem in DGTD
I am analysing the scattering property of a dielectric sphere in Lumerical DGTD. It is giving good results when the host medium is a vacuum that is refractive index 1. But when I am changing the refractive index of the host medium to any other value (say 1.5), it is not giving accurate results. Although the pattern is the same but there is an offset value when the result is compared with the Mie theory. A comparison for an index of sphere 2.5 and index of host medium 1.5 is given here:
Please let me know how to resolve this.