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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Substitution, Environment, and Excitation Wavelength Effects on the Optical Nonlinearities of Some Novel cis-/trans-π-Conjugated Azobenzenes
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Substitution, Environment, and Excitation Wavelength Effects on the Optical Nonlinearities of Some Novel cis-/trans-π-Conjugated Azobenzenes

机译：取代，环境和激发波长对某些新型顺式/反式-π共轭偶氮苯光学非线性的影响

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摘要

The transient nonlinear optical response of a series of highly π-conjugated 4,4'-diethynylazobenzene derivatives, symmetrically substituted with different electron-rich aromatic moieties (i.e., a N,N'-dihexylaniline, 4-ethynyl-(N,N',dihexylaniline), and a Zn(II)-porphyrin fragment, respectively) is investigated by means of the Z-scan technique. The systematic study of their nonlinear optical properties, using 4 ns laser excitation, revealed that all molecules possess very large third-order nonlinearity excited at 532 nm, whereas only the aniline derivatives showed nonlinear optical (NLO) response under 1064 nm excitation. In-depth investigation, both in solutions and in thin films, established that the NLO response of these azobenzene (AB) derivatives is totally attributed to their high refractive nonlinearity, presenting negligible nonlinear absorption. These findings strongly suggest that these molecules can be exploited for the development of new materials suitable for photonic/optoelectronic devices, since their strong nonlinear refraction combined with the absence of any nonlinear absorption ensures low losses, very low heating of the organic material, and eventually longer operative lifetimes.
机译：一系列高度π共轭的4,4'-二乙炔基偶氮苯衍生物的瞬态非线性光学响应，这些衍生物被不同的富电子芳族基团（即N，N'-二己基苯胺，4-乙炔基-（N，N' ，二己基苯胺）和Zn（II）-卟啉片段）分别通过Z扫描技术进行了研究。使用4 ns激光激发对它们的非线性光学性质进行系统研究，发现所有分子都具有在532 nm激发的非常大的三阶非线性，而只有苯胺衍生物在1064 nm激发下显示出非线性光学（NLO）响应。在溶液和薄膜中的深入研究证实，这些偶氮苯（AB）衍生物的NLO响应完全归因于其高折射非线性，呈现出可忽略的非线性吸收。这些发现强烈表明，这些分子可用于开发适用于光子/光电子器件的新材料，因为它们的强非线性折射与不存在任何非线性吸收的结合确保了有机材料的低损耗，极低发热，并最终手术寿命更长。

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