Attenuated-total-reflection technique for the determination of optical constants

Area of Science:

• Optics and Photonics
• Materials Science
• Thin Film Analysis

Background:

• Simultaneous characterization of complex dielectric constants, metal thickness, and dielectric overlayer parameters in glass-metal-dielectric systems is typically impossible.
• Existing methods face limitations in comprehensively analyzing multilayered thin-film structures.

Purpose of the Study:

• To propose and validate a novel method for the simultaneous characterization of dielectric thin-film overcoatings and metal surface parameters.
• To introduce the pseudo-Brewster angle as a key parameter for enhanced thin-film analysis.

Main Methods:

• Utilizing the Kretschmann attenuated-total-reflection (ATR) configuration.
• Employing the pseudo-Brewster angle (also known as the Abelés angle) as an additional measurement parameter.
• Using an admittance diagram to graphically represent the behavior of an absentee layer at the pseudo-Brewster angle.

Main Results:

• Demonstrated the feasibility of simultaneously determining dielectric overlayer properties and metal surface parameters.
• Showcased the utility of the pseudo-Brewster angle in overcoming previous characterization limitations.
• Provided a graphical illustration of the absentee layer effect using admittance diagrams.

Conclusions:

• The pseudo-Brewster angle offers a viable approach for simultaneous characterization in complex thin-film systems.
• The proposed method enhances the ability to analyze dielectric overcoatings and metal surfaces.
• Further investigation into the limitations of this technique is warranted.