Origin of potential errors in the quantitative determination of terahertz optical properties in time-domain terahertz spectroscopy

Qijun Liang; Gregor Klatt; Nico Krauß; Oleksii Kukharenko; Thomas Dekorsy

doi:10.3788/COL201513.093001

Chinese Optics Letters, Volume. 13, Issue 9, 093001(2015)

Origin of potential errors in the quantitative determination of terahertz optical properties in time-domain terahertz spectroscopy

Qijun Liang1... Gregor Klatt2, Nico Krauß1, Oleksii Kukharenko3 and Thomas Dekorsy1,* |Show fewer author(s)

Author Affiliations

¹Department of Physics and Center for Applied Photonics, University of Konstanz, 78464 Konstanz, Germany

²Laser Quantum GmbH, 78464 Konstanz, Germany

³Faculty of Physics, National Taras Shevchenko University of Kyiv, 01601 Kyiv, Ukraine

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Fig. 1. Scheme of the experimental setup: (a) without focus displacement correction and (b) with focus displacement correction.

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Fig. 2. Frequency and sample thickness dependence of the THz beam radius in the detector crystal in the off- and in-focus configurations.

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Fig. 3. THz-TDTS of high-resistivity (100) GaAs with a thickness of 990 μm in the off- and in-focus configuration: (a) time-domain data and (b) frequency-domain spectra.

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$Optical properties of high-resistivity GaAs in the THz frequency range: (a) refractive index and (b) absorption coefficient.$

Fig. 4. Optical properties of high-resistivity GaAs in the THz frequency range: (a) refractive index and (b) absorption coefficient.

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Table 1. Beam Radius in Off- and In-focus Configuration
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Table 1. Beam Radius in Off- and In-focus Configuration
Configuration Position $w (z)$
$z = 0$ $w_{0}$
Off-focus $z = 4 f$ $\sqrt{n w_{0}^{2} + \frac{{(n - 1)}^{2} d^{2} c^{2}}{4 n π^{2} w_{0}^{2} ν^{2}}}$
$z = 8 f$ $\sqrt{w_{0}^{2} + \frac{{(n - 1)}^{2} d^{2} c^{2}}{n^{2} π^{2} w_{0}^{2} ν^{2}}}$
In-focus $z = 4 f + Δ / 2$ $\sqrt{n} w_{0}$
$z = 8 f + Δ$ $w_{0}$

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Qijun Liang, Gregor Klatt, Nico Krauß, Oleksii Kukharenko, Thomas Dekorsy, "Origin of potential errors in the quantitative determination of terahertz optical properties in time-domain terahertz spectroscopy," Chin. Opt. Lett. 13, 093001 (2015)

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