一种新的手征电光效应：直流电场作用下旋光液体的和频产生
A new chiral electro-optic effect: Sum-frequency generation from optically active liquids in the presence of a dc electric field
摘要：
我们报告了和频信号的观察结果，该信号线性依赖于所施加的静电场，并且随着光学活性溶液的旋向性而改变符号。这种最近预测的手征电光效应在电偶极近似下存在。静态电场产生电场诱导的和频信号（非手性三阶过程），其在二阶处干扰手性特定的和频。在静电场中线性的交叉项构成了这种效应，可以用来确定各向同性介质中二阶和三阶非线性光学极化率的绝对符号。
英文摘要：
We report the observation of sum-frequency signals that depend linearly on an applied electrostatic field and that change sign with the handedness of an optically active solution. This recently predicted chiral electro-optic effect exists in the electric-dipole approximation. The static electric field gives rise to an electric-field-induced sum-frequency signal (an achiral third-order process) that interferes with the chirality-specific sum-frequency at second-order. The cross-terms linear in the electrostatic field constitute the effect and may be used to determine the absolute sign of second- and third-order nonlinear optical susceptibilities in isotropic media.
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