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Phase-modulated ellipsometer using a Fourier transform infrared spectrometer for real time applications
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A new Fourier transform infrared phase‐modulated ellipsometer is presented. It combines the high frequency provided by a photoelastic modulator (37 kHz) with the low frequency of the Fourier transform infrared spectroscopy (<1 kHz), by means of a numerical data acquisition system. A full spectrum recording (from 900 to 4000 cm−1) can be achieved in 2 s. Thus, it allows its adaptation for kinetic in situ studies. The optical setup and the data reduction procedure are presented. In particular, a self‐consistent spectral calibration procedure is described in detail. The precision in Ψ and Δ increases from 0.3° to 0.02° when increasing the integration time from 2 to 760 s. The examples shown in this article illustrate the high sensitivity to identify and analyze the absorption vibration variations of ultrathin films (a few angstroms thick).
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CANILLAS I BIOSCA, Adolf, PASCUAL MIRALLES, Esther and DRÉVILLON, B. Phase-modulated ellipsometer using a Fourier transform infrared spectrometer for real time applications. Review of Scientific Instruments. 1993. Vol. 64, num. 8, pags. 2153-2159. ISSN 0034-6748. [consulted: 5 of August of 2026]. Available at: https://hdl.handle.net/2445/25058