Create your fanciest forward-scattering dicks!

https://omlc.org/calc/mie_calc.html

Parameters for the OP pic:
Sphere Diameter 1.0 microns
Refractive Index of Medium 1.0
Real Refractive Index of Sphere 2.21
Imaginary Refractive Index of Sphere -0.012
Wavelength in Vacuum 1.015 microns
Concentration 0.1 spheres/micron3