论文标题
薄膜有机半导体中Brunel谐波产生的共振效应
Resonance effects in Brunel harmonic generation in thin film organic semiconductors
论文作者
论文摘要
由于其出色的光学和电子特性，有机半导体引起了广泛的关注。在这里，我们提出了两种类型的卟啉薄膜中布鲁内尔谐波产生的实验和理论研究：四苯基卟啉（TPP）及其有机金属复合衍生物锌四苯基卟啉（ZNTPP）。我们的结果表明，卟啉环蛋白圈系统的$π$ - $π^\ ast $激发在谐波生成过程中起主要作用。我们揭示了频带过程对布鲁内尔谐波产生的贡献。特别是，发现共鸣（$ s_0 \ rightArrow s_2 $ transition）增强的多光子激发会导致第五次谐波的非扰动行为的早期发作。其他有机材料的Brunel谐波产生预计会产生类似的共振效应。
Organic semiconductors have attracted extensive attention due to their excellent optical and electronic properties. Here, we present an experimental and theoretical study of Brunel harmonic generation in two types of porphyrin thin films: tetraphenylporphyrin (TPP) and its organometallic complex derivative Zinc tetraphenylporphyrin (ZnTPP). Our results show that the $π$-$π^\ast$ excitation of the porphyrin ringsystem plays a major role in the harmonic generation process. We uncovered the contribution of an interband process to Brunel harmonic generation. In particular, the resonant ($S_0 \rightarrow S_2$ transition) enhanced multiphoton excitation is found to lead to an early onset of non-perturbative behavior for the 5th harmonic. Similar resonance effects are expected in Brunel harmonic generation with other organic materials.
