When the photon ACTS as the medium of electric field, it is called photonic polaron. In this case, the photon is polarized as positive and negative electric charge.
光子作为电场的介质时，称为光极子。这时，光子具有正、负电荷的极性。
Taking anthracene-porphyrin-anthracene triads as example, we found that the intra-molecular charge transfer process can largely enhance the three-photon absorption cross-section.
以蒽-卟啉-蒽分子为例，从激发态之间的跃迁密度分析发现，分子内电荷转移过程可以极大地增强三光子吸收。
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