双折射聚合物薄膜中单分子的低温光谱动力学
Low temperature spectral dynamics of single molecules in ultrathin polymer films
摘要：
研究了低温下无定形聚合物聚异丁烯（polyisobutylene）薄膜（5 - 100 nm）中荧光染料分子的光谱动力学及其随薄膜厚度的变化。在系综中，有相当一部分分子表现出与标准隧穿模型不一致的行为：它们的谱线具有不可逆的谱跳跃、连续移动和谱线宽度或跳跃率的突然混沌变化。在薄膜薄于100 nm，“非标准”的光谱行为的发生增加，在固定的激发强度的样品厚度减小。此外，它还随着激光强度的增加而增加。
英文摘要：
We studied the spectral dynamics of single fluorescent dye molecules embedded in ultrathin films (5 - 100 nm) of the amorphous polymer polyisobutylene at cryogenic temperatures and its variation with film thickness. Noticeable portion of molecules in the ensemble show a behavior which is inconsistent with the standard tunneling model: Their spectral lines are subject to irreversible spectral jumps, continuous shifting, and abrupt chaotic changes of the linewidth or jumping rate. In films thinner than 100 nm, the occurrence of "non-standard" spectral behavior increases with decreasing sample thickness at fixed excitation intensity. In addition, it also increases with laser intensity.
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