Determination of the time origin by the maximum entropy method in time-domain terahertz emission spectroscopy.
Open accessAbstract
We have developed a scheme for determining the time origin by the maximum entropy method (MEM) in time-domain terahertz (THz) emission spectroscopy. By applying the MEM to trial damped sinusoidal waveforms, we confirmed that the MEM gives true phase shifts across the resonance features and that its inherent uncertainty in determining the time origin is +/-15 fs for 100-fs-class excitation/sampling optical pulses. Furthermore, when the MEM was applied to a THz waveform recorded experimentally with a finite sampling interval for the Bloch oscillation in a semiconductor superlattice, a misplacement of the time origin was indeed detected with an accuracy limited by the worse of the MEM inherent uncertainty and the sampling interval.
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Existing computational techniques such as MEM, SSKK, MSKK, and DMSKK require heavy iterations or knowledge of anchor points to converge to accurate values.
“These techniques require heavy iterations or the knowledge of socalled 'anchor points' (i.e., points where the properties of the samples are known) to converge to accurate values.”
From Robust phase correction techniques for terahertz time-domain reflection spectroscopy (2024) · cites this paper as [21]
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References 18 · Cited by 17
- Authors
- Unuma, T., Ino, Y., Kuwata-Gonokami, M., Vartiainen, E. M., Peiponen, K.-E., & Hirakawa, K.
- Affiliations
- Institute of Industrial Science, The University of Tokyo (JP)
- The University of Tokyo (JP)
- Venue
- Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2010-07-12
- Volume
- 18
- Issue
- 15
- Pages
- 15853
- ISSN
- 1094-4087 (ISSN-L)
- OpenAlex
- W1982687775
- Cited by
- 17
- References
- 18
- Citations by year
- 2026: 1 · 2023: 2 · 2022: 1 · 2021: 3 · 2019: 2 · 2018: 1 · 2016: 1 · 2014: 2 · 2013: 1 · 2012: 2
- FWCI
- 1.01
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optics Express (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Physical Sciences › Chemistry › Spectroscopy › Spectroscopy and Laser Applications
- Keywords
- maximum entropy method, phase difference measurement, Bloch oscillations, semiconductor superlattices, femtosecond pulses
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