Nonlinear optical response of photochromic azobenzene-functionalized self-assembled monolayers.
Nonlinear optical response of photochromic azobenzene-functionalized self-assembled monolayers.
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DOI：
10.1039/c5cp03093e
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发表时间：
2015-07
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影响因子：
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通讯作者：
M. Schulze;M. Utecht;Thomas Moldt;Daniel Przyrembel;C. Gahl;M. Weinelt;P. Saalfrank;P. Tegeder
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文献类型：
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作者：
M. Schulze;M. Utecht;Thomas Moldt;Daniel Przyrembel;C. Gahl;M. Weinelt;P. Saalfrank;P. Tegeder
偶氮苯功能化的自组装单分子膜（SAMs）具有光致变色和非线性光学（NLO）特性，这是实现新型光子和光电器件的一个有趣的步骤。通过利用二阶非线性光学过程的二次谐波产生（SHG），密度泛函理论和相关波函数方法计算的支持下，我们证明了光致变色界面提供了必要的先决条件，对未来可能的技术应用的路线：我们发现一个高的非线性光学对比度的顺序为16%之间的开关状态。此外，对于两种光异构化反应，它们是可逆的，并且在10（-18）cm（2）量级的横截面方面具有高效率，即，可通过低功率LED光源驱动。最后，两种光稳态（PSS）在环境条件下是热稳定的。
The combination of photochromic and nonlinear optical (NLO) properties of azobenzene-functionalized self-assembled monolayers (SAMs) constitutes an intriguing step towards novel photonic and optoelectronic devices. By utilizing the second-order NLO process of second harmonic generation (SHG), supported by density-functional theory and correlated wave function method calculations, we demonstrate that the photochromic interface provides the necessary prerequisites en route towards possible future technical applications: we find a high NLO contrast on the order of 16% between the switching states. These are furthermore accessible reversibly and with high efficiencies in terms of cross sections on the order of 10(-18) cm(2) for both photoisomerization reactions, i.e., drivable by means of low-power LED light sources. Finally, both photostationary states (PSSs) are thermally stable at ambient conditions.