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Optical methods for thickness measurements on thin metal films.
Applied Optics
|August 14, 2010
Summary
Two methods, transmission-ellipsometry (TELL) and attenuated total reflection (ATR), accurately determine thin metal film properties. These techniques were validated on gold and chromium films, confirming their effectiveness for optical characterization.
Area of Science:
- Materials Science
- Optics
- Thin Film Technology
Background:
- Accurate characterization of thin metal films is crucial for various optical and electronic applications.
- Determining film thickness and dielectric constants requires reliable and precise measurement techniques.
Purpose of the Study:
- To compare the effectiveness of two distinct methods for characterizing thin metal films.
- To determine the thickness and dielectric constants of gold and chromium films on glass substrates.
Main Methods:
- The study employed a combination of transmission and ellipsometer measurements (TELL method).
- Attenuated total reflection (ATR) in the Kretschmann arrangement was used as a second, comparative method.
- Both methods utilized a He-Ne laser at a 633-nm wavelength for measurements.
Main Results:
- Both the TELL and ATR methods successfully determined the thickness and dielectric constants of gold films (20-80 nm).
- The TELL method was also effective for characterizing thicker chromium films (up to 150 nm).
Conclusions:
- The TELL and ATR methods provide reliable characterization of thin metal films.
- These techniques are suitable for determining optical properties of gold and chromium films within the tested thickness ranges.
