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Understanding the Role of the Evanescent Field in Attenuated Total Reflection (ATR) Spectroscopy

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Evanescent waves have little to no significant role in ATR spectroscopy, which contrasts common assumptions about their importance.
ATR spectra can be captured below the critical angle, where no evanescent field exists, indicating a shift in how we understand interaction at the interface.
Comparative analysis of electric field maps for semi-infinite and layered rarer media illustrates smooth variation with incidence angle and dielectric properties.
Critical angle in the presence of absorption is defined by equality of real and imaginary components of the wavevector, reshaping conventional definitions.

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Analysis reveals weak significance of evanescent field in ATR spectroscopy, suggesting alternative mechanisms influencing outcomes.

Mayerhöfer et al. (2025) studied this question.

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