纳米打印晶体中单分子的高分辨低温光谱学
High-resolution Cryogenic Spectroscopy of Single Molecules in Nanoprinted Crystals
AI总结：
本文利用2 K高分辨荧光激发光谱表征电流体动力学打印的蒽纳米晶体中单个DBT分子，证明其零声子线接近体相傅里叶极限且光谱稳定，并实现晶体尺寸与晶轴取向测定。
摘要：
我们在液氦温度（T=2 K）下进行激光光谱研究，以考察掺杂在通过电流体动力学滴落制备的纳米级厚度蒽晶体中的单个二苯并三苯（DBT）分子。利用高分辨荧光激发光谱，我们表明打印纳米晶体中单分子的零声子线几乎与在体相中同一客体—主体体系所观测到的傅里叶极限跃迁一样窄。此外，光谱不稳定性相当于或小于一个线宽。通过记录 DBT 分子的超分辨图像并改变激发光束的偏振，我们确定了打印晶体的尺寸及其晶轴取向。有机纳米晶体和微米晶体的电流体动力学打印为一系列应用铺平了道路，这些应用需要对具有窄光学跃迁的量子发射体进行可控定位。
英文摘要：
We perform laser spectroscopy at liquid helium temperatures (T=2 K) to investigate single dibenzoterrylene (DBT) molecules doped in anthracene crystals of nanoscopic height fabricated by electrohydrodynamic dripping. Using high-resolution fluorescence excitation spectroscopy, we show that zero-phonon lines of single molecules in printed nanocrystals are nearly as narrow as the Fourier-limited transitions observed for the same guest-host system in the bulk. Moreover, the spectral instabilities are comparable to or less than one linewidth. By recording super-resolution images of DBT molecules and varying the polarization of the excitation beam, we determine the dimensions of the printed crystals and the orientation of the crystals' axes. Electrohydrodynamic printing of organic nano and microcrystals paves the way for a series of applications, where controlled positioning of quantum emitters with narrow optical transitions is desirable.
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