Ellipsometry using imperfect polarizers.

Area of Science:

• Optical Physics
• Spectroscopy
• Materials Science

Background:

• Ellipsometry is a powerful technique for characterizing material properties.
• Far ultraviolet (UV) ellipsometry is crucial for studying electronic transitions and surface phenomena.
• Previous far UV ellipsometric studies often assumed incident light was fully polarized.

Purpose of the Study:

• To address the limitations of assuming coherent polarized light in far UV ellipsometry.
• To demonstrate the necessity of modifying experimental techniques for partially polarized light.
• To provide a more accurate framework for far UV ellipsometric measurements.

Main Methods:

• Theoretical analysis of ellipsometric measurements under partially polarized light conditions.
• Comparison of experimental requirements for coherent versus partially polarized incident light.
• Identification of modifications needed for reflection polarizers in far UV ellipsometry.

Main Results:

• The assumption of coherent polarization is often invalid for light sources used in far UV.
• Partially polarized light, a mixture of polarized and unpolarized components, significantly affects measurements.
• Existing ellipsometric techniques require substantial modifications to account for partial polarization.

Conclusions:

• Far UV ellipsometry must account for the general state of partial polarization.
• Modified experimental approaches are essential for reliable and accurate far UV ellipsometric data.
• This work highlights a critical consideration for advancing optical characterization techniques.