Backscattering Mueller matrices from bead-blasted aluminium surfaces

Physics – Optics

Scientific paper

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Scientific paper

The backscattering Mueller matrices for a range of bead- blasted aluminium samples having a range of surface roughness and slopes are investigated using a 632.8nm linearly polarized HeNe laser. The analyzing polarizing optics and detector are fixed in the backscattering direction and the angle of incidence varied from 0 degrees to 90 degrees. A computer controlled Mueller matrix scatterometer determines the matrix elements. The incident polarization states are set via combinations of a polarizer and waveplates and the backscattered light is Fourier analyzed using a rotating compensator and fixed linear polarizer. The surfaces were characterized using a surface profilometer and the variation of the Mueller matrix elements with incidence angle determined. Only four elements of the normalized Mueller matrix are non-zero. Of these, three vary with incidence angle and the fourth is normalized to unity. A depolarization term P(subscript D) calculated from the matrix elements is shown to decrease with increasing angle of incidence. Its value at normal incidence reduces with increasing bead-blast pressure.

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