Sirbuly Donald J, Gargas Daniel J, Mason Michael D, Carson Paul J, Buratto Steven K
Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
ACS Nano. 2008 Jun;2(6):1131-6. doi: 10.1021/nn700209f.
Polarization anisotropy is investigated in single porous silicon nanoparticles containing multiple chromophores. Two classes of nanoparticles, low current density and high current density, are studied. Low current density samples exhibit red-shifted spectra and contain only one or two chromophores. High current density particles, on average, contain less than four chromophores and display a blue-shifted spectrum. We utilize single-molecule spectroscopy to probe the polarization effects of the particles, and we show that both classes of particles are influenced by a polarized excitation source. These results are exciting at the fundamental level for understanding coupled quantum dot emitters as well as for applications involving single-photon sources or silicon-based polarization-sensitive detectors.
在含有多个发色团的单个多孔硅纳米颗粒中研究了偏振各向异性。研究了两类纳米颗粒，即低电流密度和高电流密度的纳米颗粒。低电流密度样品呈现红移光谱，且仅包含一两个发色团。高电流密度颗粒平均包含少于四个发色团，并显示蓝移光谱。我们利用单分子光谱来探测颗粒的偏振效应，并且我们表明这两类颗粒都受到偏振激发源的影响。这些结果在基础层面上对于理解耦合量子点发射器以及涉及单光子源或基于硅的偏振敏感探测器的应用而言是令人兴奋的。
