DIRECT FABRY-PÉROT EFFECT REMOVAL
Abstract
This study indicates that the removal of reflections from T-ray signals can be carried out in the frequency domain without prior knowledge of material parameters or sample thickness. By fitting polynomials to the logarithm and the argument of the sample's transfer function, the Fabry-Pérot reflection term is canceled out, leading to disappearance of the reflections in spatial domain. The method successfully removes the reflections for optically thick samples under the condition of noise or amplitude fluctuations. The application to optically thin samples is possible when the samples are subjected to broadband terahertz measurements. The Fabry-Pérot free signal, when used as input to the parameter estimation method, results in correct material parameters with low variance.
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Increasing sample thickness decreases the variance in optical constants due to amplitude variance, but also lowers the sample signal amplitude and thus lifts the overall variance.
“Increasing the thickness will seemingly decrease the variance in the optical constants.”
From Uncertainty in terahertz time-domain spectroscopy measurement (2008) · cites this paper as [20]
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References 12 · Cited by 21
- Authors
- WITHAYACHUMNANKUL, W., FERGUSON, B., RAINSFORD, T., MICKAN, S., & ABBOTT, D.
- Affiliations
- The University of Adelaide (AU)
- Venue
- Fluctuation and Noise Letters
- Publisher
- World Scientific Pub Co Pte Lt
- Published
- 2006-06
- Volume
- 06
- Issue
- 02
- Pages
- L227-L239
- ISSN
- 0219-4775 (ISSN-L)
- 1793-6780
- OpenAlex
- W2087110487
- Cited by
- 21
- References
- 12
- Citations by year
- 2025: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 1 · 2017: 3 · 2016: 1 · 2015: 1
- FWCI
- 2.36
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Fluctuation and Noise Letters (publishedVersion)
- Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Chemistry › Spectroscopy › Spectroscopy and Laser Applications
- Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
- Keywords
- Fabry-Perot effect, reflection removal, terahertz transmission, frequency-domain signal processing, polynomial fitting, transfer function, material parameter identification
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