Abstract- Accurate terahertz spectroscopy of supported thin films by precise substrate thickness correction

Keno L. Krewer, Zoltan Mics, Jacek Arabski, Guy Schmerber, Eric Beaurepaire, Mischa Bonn, and Dmitry Turchinovich

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-43-3-447

We present a new approach for accurate terahertz time-domain spectroscopy of thin films deposited on dielectric substrates. Our approach relies on the simultaneous measurement of film and substrate, allowing for 15 nm—precise determination of the thickness variation between the sample and reference. Our approach allows for unprecedentedly accurate determination of the terahertz conductivity of the thin film. We demonstrate our approach on a 10 nm thin iron film deposited on a 500 μm MgO substrate. We determine the Drude momentum relaxation time in iron to within 0.15 fs uncertainty.

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