High-speed terahertz time-domain polarimeter based on an electro-optic modulation technique

Yasumatsu, Naoya; Kasatani, Atsushi; Oguchi, Kenichi; Watanabe, Shinichi

doi:10.7567/apex.7.092401

Cited by 25 publications

(15 citation statements)

References 20 publications

(30 reference statements)

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“…Indeed, the strong influence of carbon-based additives on the optical properties of polymeric composite materials within the terahertz frequency region has been reported using terahertz spectroscopy1315161718192023. Moreover, very recently, polarization-sensitive (PS) measurements using terahertz waves have been drastically improved by the efforts of many researchers2728293031323334. In particular, polarization spectroscopy for polymer materials has been utilized for evaluating the molecular orientation of polymer materials, which is strongly related to their mechanical, optical, and electrical properties678910353637.…”

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confidence: 99%

Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy

Okano

Watanabe

2016

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Elastomers are one of the most important materials in modern society because of the inherent viscoelastic properties due to their cross-linked polymer chains. Their vibration-absorbing and adhesive properties are especially useful and thus utilized in various applications, for example, tires in automobiles and bicycles, seismic dampers in buildings, and seals in a space shuttle. Thus, the nondestructive inspection of their internal states such as the internal deformation is essential in safety. Generally, industrial elastomers include various kinds of additives, such as carbon blacks for reinforcing them. The additives make most of them opaque in a wide spectral range from visible to mid-infrared, resulting in that the nondestructive inspection of the internal deformation is quite difficult. Here, we demonstrate transmission terahertz polarization spectroscopy as a powerful technique for investigating the internal optical anisotropy in optically opaque elastomers with conductive additives, which are transparent only in the terahertz frequency region. The internal deformation can be probed through the polarization changes inside the material due to the anisotropic dielectric response of the conductive additives. Our study about the polarization-dependent terahertz response of elastomers with conductive additives provides novel knowledge for in situ, nondestructive evaluation of their internal deformation.

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Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy

Okano

Watanabe

2016

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“…Finally, we point out the advantage of using the h110ioriented zinc blende crystal instead of the h111i-oriented crystal with three-fold symmetry, the latter of which is useful for generating arbitrary terahertz waveforms [43], and highaccuracy [44] and/or high-speed [45] terahertz E-field polarization detection using a polarization modulation technique. When the h110i-oriented zinc blende crystal is used we can derive the equivalent representations of the terahertz vector waveform, E 1 t, in two different coordinate systems, fX 1 ;Ŷ 1 ;Ẑ 1 g and fX 2 ;Ŷ 2 ;Ẑ 2 g, as shown in Eq.…”

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confidence: 99%

Polarization detection of terahertz radiation via the electro-optic effect using zinc blende crystal symmetry

2014

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We provide a frequency-domain picture of the electro-optic (EO) detection of elliptically polarized terahertz radiation utilizing the crystal angle dependence of the EO effect using zinc blende crystal symmetry. In contrast to EO detection of a linearly polarized terahertz pulse, the measured EO signal would not be a replica of the terahertz pulse, even though the phase-matching condition is completely fulfilled. However, the rotation of the EO crystal reduces the complexity, and the ellipticity and the angle of rotation of each frequency component of the elliptically polarized terahertz pulse can be determined irrespective of what kind of zinc blende crystals are used for the EO detection. We experimentally show that the ellipticity and angle of rotation are reproducibly obtained by using three different crystals with different thicknesses and compositions. Direct detection of the elliptically polarized terahertz radiation enables us to precisely determine the optical axis and retardation of a quartz crystal using the Poincaré sphere representation of the state of polarization.

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“…Nemoto et al have used a photo-elastic device to modulate the polarization of the optical probe beam, and thus to increase the polarization sensitivity of EO detection of THz waves. Yasumatsu et al modulate also the probe beam polarization, but after it crosses the EO crystal [32]. In the present paper, we study a classical scheme of EO detection [33] and, as for OR generation, we give practical analytic expressions of the recorded signal versus the impinging THz field and the orientation of the EO crystal axes and of the necessary wave-plates.…”

Section: Introductionmentioning

confidence: 98%

“…The second part is dedicated to vectorial EO sampling using the same cubic crystal orientation as for OR. Contrary to [28]- [30], [32], the crystal is probed by a fixed circular optical beam and does not require any additional modulation. Such experimental configuration provides a detection efficiency which is transversely homogeneous.…”

Section: Introductionmentioning

confidence: 99%

Emitting and Receiving Terahertz Vectorial Antennas Based on Cubic Electro-Optic Crystals

Gaborit¹,

Bičiūnas²,

Bernier³

et al. 2015

IEEE Trans. THz Sci. Technol.

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Based on optical rectification in a ZnTe crystal, a vectorial terahertz (THz) emitter is here theoretically and experimentally demonstrated. The use of the particular orientation leads to a polarization state angle tunable THz source. This configuration requires only an optical wave plate to manage the impinging optical polarization state, thus adjusting the transverse THz electric field orientation. Moreover, the optical rectification efficiency as well as the THz signal bandwidth remain constant from horizontal to vertical Terahertz polarization. The same crystal, acting then like a THz receiver, allows to perform the vectorial analysis of a THz pulse.

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High-speed terahertz time-domain polarimeter based on an electro-optic modulation technique

Cited by 25 publications

References 20 publications

Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy

Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy

Polarization detection of terahertz radiation via the electro-optic effect using zinc blende crystal symmetry

Emitting and Receiving Terahertz Vectorial Antennas Based on Cubic Electro-Optic Crystals

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