Analytic ellipsometric measurement for materials under bulk encapsulation

Area of Science:

• Solid-state physics
• Materials science
• Optical materials

Background:

• Accurate dielectric function measurement is crucial for optical materials in solid-state physics.
• Chemically reactive materials pose challenges for in-situ measurements due to ambient conditions.
• Traditional spectroscopic ellipsometry methods struggle with complex fitting and unphysical results for new materials.

Purpose of the Study:

• To develop an ambient-condition ellipsometry method for measuring dielectric functions of reactive materials.
• To demonstrate the effectiveness and accuracy of the proposed analytical ellipsometry method (AEM).
• To provide a generalized and convenient strategy for ellipsometric measurements of sensitive materials.

Main Methods:

• Development of an analytical ellipsometry method (AEM).
• Application of AEM for measuring dielectric functions of chemically reactive materials under bulk encapsulation.
• Systematic demonstration of AEM's effectiveness and error analysis using sodium films as an example.

Main Results:

• AEM successfully measures dielectric functions of reactive materials in ambient conditions.
• The method demonstrates superiority over traditional spectroscopic ellipsometry, avoiding complex fitting and unphysical results.
• Effectiveness and measuring errors of AEM were systematically validated using low-loss plasmonic sodium films.

Conclusions:

• The developed AEM offers a generalized and convenient strategy for ellipsometric measurements of sensitive materials.
• AEM overcomes key limitations of traditional methods, enabling accurate dielectric function determination for challenging materials.
• This advancement facilitates further research in solid-state physics and the development of novel optical materials.