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首页> 外文期刊>Advanced Functional Materials >Pump-Push-Probe for Ultrafast All-Optical Switching: The Case of a Nanographene Molecule
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Pump-Push-Probe for Ultrafast All-Optical Switching: The Case of a Nanographene Molecule

机译：用于超快全光切换的泵推探针：纳米石墨烯分子的情况

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摘要

In the last two decades, the three-beam pump-push-probe (PPP) technique has become a well-established tool for investigating the multidimensional configurational space of a molecule, as it permits disclosure of precious information about the multiple and often complex deactivation pathways of the excited molecule. From the spectroscopic point of view, such a tool has revealed details about the efficiency of charge pair generation and conformational relaxation in pi-conjugated molecules and macromolecules. In addition, PPP is effectively utilized for modulating the gain signal in conjugated materials by taking advantage of the spectral overlap between stimulated emission and charge absorption in those systems. However, the relatively low stability of conjugated polymers under intense photoexcitation is a crucial limitation for their real employment in plastic optical fibers (POFs) and for signal control applications. Herein, the role of PPP for achieving ultrafast all-optical switching in pi-conjugated systems is highlighted. Furthermore, new experimental data on optical switching of a newly synthesized nanographene molecule, namely dibenzo[hi,st]ovalene (DBOV), is reported. The superior environmental and photostability of DBOV and, in general, of graphene nanostructures can represent a great advantage for their effective applications in POFs and information and communications technology.
机译：在过去的二十年中，三束泵浦推进探针（PPP）技术已成为研究分子多维结构空间的成熟工具，因为它可以公开有关多次失活（通常是复杂的失活）的宝贵信息激发分子的途径。从光谱学的角度来看，这种工具揭示了有关pi共轭分子和大分子中电荷对生成效率和构象松弛的细节。此外，通过利用那些系统中受激发射和电荷吸收之间的光谱重叠，PPP可有效地用于调制共轭材料中的增益信号。但是，共轭聚合物在强光激发下的相对较低的稳定性是对其在塑料光纤（POF）中的实际应用以及信号控制应用的关键限制。在此，强调了PPP在pi共轭系统中实现超快速全光交换的作用。此外，还报道了关于新合成的纳米石墨烯分子即二苯并[n] -st'ovalene（DBOV）的光开关的新实验数据。 DBOV以及通常的石墨烯纳米结构具有优越的环境和光稳定性，可将其有效地应用于POF，信息和通信技术中，这代表了巨大的优势。

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