Terahertz-field-induced optical birefringence in common window and substrate materials

We apply intense terahertz (THz) electromagnetic pulses with field strengths exceeding 2 MV cm(-1) at ~1 THz to window and substrate materials commonly used in THz spectroscopy and determine the induced optical birefringence. Materials studied are diamond, sapphire, magnesium oxide (MgO), polymethyl...

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Bibliographic Details
Published inOptics express Vol. 23; no. 22; pp. 28985 - 28992
Main Authors Sajadi, Mohsen, Wolf, Martin, Kampfrath, Tobias
Format Journal Article
LanguageEnglish
Published United States 02.11.2015
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Summary:We apply intense terahertz (THz) electromagnetic pulses with field strengths exceeding 2 MV cm(-1) at ~1 THz to window and substrate materials commonly used in THz spectroscopy and determine the induced optical birefringence. Materials studied are diamond, sapphire, magnesium oxide (MgO), polymethylpentene (TPX), low-density polyethylene (LDPE), silicon nitride membrane (SiN) and crystalline quartz. We observe a Kerr-effect-type transient birefringence in all samples, except in quartz and Si, where, respectively, a linear electrooptic signal and a response beyond the perturbative regime are found. We extract the nonlinear refractive indices and the electrooptic coefficient (in the case of quartz) of these materials and discuss implications for their use as windows or substrates in THz pump-optical probe spectroscopy.
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content type line 23
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.23.028985