This work demonstrates prismless ATR's effectiveness in measuring material properties across different frequencies, suggesting new possibilities for optical analysis.
Attenuated total reflection (ATR) has long relied on a familiar trio—prism, metal film, and substrate—to unlock insights into material properties. In this work, we demonstrate the possibility and limitations of a prismless ATR system that utilizes the relative permittivity of air in place of a prism, followed by a plasmonic test material, which is in turn followed by a novel material characterized by low real relative permittivity and near-zero imaginary relative permittivity. We show that such measurements are possible in the visible IR and UV frequency ranges. In addition, we illustrate the advantages of prismless ATR.
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Levy et al. (2026) studied this question.
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