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Large Third-order Optical Nonlinearity Realized In Symmetric Nonpolar Carotenoids

机译:对称非极性类胡萝卜素中实现的大三阶光学非线性

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We show that a very large enhancement of third-order optical nonlinearity (γ) of π-conjugated molecules can be realized without a major redshift of the absorption spectrum that disturbs optical transparency in the visible region. By changing the number (n) of C=C bonds of β carotene (n= 11) from 7 to 15, a remarkable 3.4-fold increase in the γ value was observed when n= 15 relative to that of β carotene. This enhancement of γ mainly originates from three-photon resonance of a lowest optically allowed excited state. The controversial higher-lying essential state is not important for generating the large value of γ.
机译:我们表明,可以实现π共轭分子的三阶光学非线性(γ)的极大增强,而不会出现吸收光谱的大红移,而这不会干扰可见光区域的光学透明性。通过将β-胡萝卜素(n = 11)的C = C键的数目(n)从7改变为15,当n = 15时,观察到γ值相对于β-胡萝卜素的γ值显着增加了3.4倍。 γ的这种增强主要来自光学允许的最低激发态的三光子共振。有争议的较高的基本状态对于生成较大的γ值并不重要。

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