Patent ID: 11959852
Assignee: PARK SYSTEMS CORP.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for determining properties of a sample (12) by ellipsometry, comprising the steps of:
providing an ellipsometer (10) having a reference axis (z),
positioning the sample (12) in the ellipsometer (10) so that a surface normal (n) of a measurement region of the sample surface is tilted relative to the reference axis (z) of the ellipsometer (10),
measuring a Mueller matrix for the measurement region,
creating an equation system that is not underdetermined, the equation system equating the measured Mueller matrix to a matrix product formed of
a rotation matrix about an input rotation angle (γ),
an isotropic Mueller matrix in normalized NCS form and
a rotation matrix about an output rotation angle (−δ) that is applied independently of the input rotation angle (γ), and

solving the equation system for the parameters representing the sample properties to be determined.