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Two-dimensional spectroscopy of electrooptical response

电光响应的二维光谱

基本信息

批准号：
10450032
负责人：
HAYAKAWA Reinosuke
金额：
$ 3.52万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

A new measurement method for second-order nonlinear after-effect function has been developed. Theoretical calculation starting from a general time-evolution equation connects nonlinear responses in time domain and frequency domain, and thus gives the nonlinear response to applied external field of arbitrary form. In addition, it turns out in the frequency domain that the dc component of a second-order nonlinear response function corresponds to a linear response function.For example, the dc component of the electric birefringence relaxation is equivalent to the dielectric relaxation. This simple relation indicates an advantage of a frequency-domain measurement for nonlinear responses. As an example, the electric birefringence relaxation is measured in two-dimensional frequency domain for aqueous solution of sodium poly(styrenesulfonate) to confirm the validity of the theoretical results.The above electric birefringence is caused by the orientation of rodlike molecule without changing the shape under applied electric field. If the molecule can deform, however, the elastic deformation due to electric field will also yield birefringence. Since the deformation has a characteristic timeτ, the electric birefringence is expected to occur in the frequency region of τィイD2-1ィエD2. By the frequency-domain electric birefringence spectroscopy, we confirmed this prediction with water/AOT/isooctane (w/o) microemulsion, which has dispersed phase of spherical water droplet coated by the mono-layer surfactant of AOT in continuous oil phase.

开发了一种新的二阶非线性后效应函数测量方法。从一般时间演化方程出发的理论计算将时域和频域的非线性响应联系起来，从而给出了对任意形式的外加场的非线性响应。另外，在频域中，二阶非线性响应函数的直流分量对应于线性响应函数。例如，电双折射弛豫的直流分量相当于介电弛豫。这种简单的关系表明了频域测量非线性响应的优势。以聚苯乙烯磺酸钠水溶液二维频域测量电双折射弛豫为例，验证了理论结果的有效性。上述电双折射是由于棒状分子在外加电场作用下形状不改变而发生取向引起的。然而，如果分子可以变形，则电场引起的弹性变形也会产生双折射。由于变形具有特征时间τ，因此预计电双折射会发生在τィイD2-1ィエD2 的频率区域中。通过频域电双折射光谱，我们用水/AOT/异辛烷（w/o）微乳液证实了这一预测，该微乳液在连续油相中具有被单层AOT表面活性剂包覆的球形水滴分散相。