Terahertz-field-induced optical birefringence in common window and substrate materials.
Terahertz-field-induced optical birefringence in common window and substrate materials.
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DOI：
10.1364/oe.23.028985
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发表时间：
2015-11
期刊：
影响因子：
3.8
通讯作者：
M. Sajadi;M. Wolf;T. Kampfrath
中科院分区：
文献类型：
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作者：
M. Sajadi;M. Wolf;T. Kampfrath
我们施加强太赫兹（THz）电磁脉冲，场强超过2 MV cm（-1）在~1 THz的窗口和基板材料中常用的太赫兹光谱，并确定诱导的光学双折射。研究的材料是金刚石，蓝宝石，氧化镁（MgO），聚甲基戊烯（TPX），低密度聚乙烯（LDPE），氮化硅膜（SiN）和晶体石英。我们观察到的克尔效应型瞬态双折射在所有的样品中，除了石英和Si，其中，分别，一个线性的电光信号和响应超出微扰regions. We提取的非线性折射率和电光系数（在石英的情况下），这些材料和讨论其作为窗口或基板在太赫兹泵浦光探测光谱的影响。
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.