کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5429694 | 1397366 | 2011 | 6 صفحه PDF | دانلود رایگان |

The plasmonic enhancement of nanoshelled nanocavity (a silica core coated by Ag or Au shell) on the spontaneous emission of an encapsulated emitter (a molecule or quantum dot) is studied systematically by analyzing the excitation rate and the apparent quantum yield together. By averaging all possible locations and orientations of the emitter, the average enhancement factor (AEF) of the emitter randomly located in the core is calculated. Our results show that the AEF is weaker than that of the emitter located at the core center. In addition, Ag nanoshell (NS) is a narrowband enhancer. As the thickness of the shell becomes thinner, the surface plasmon resonance of NS is red-shifted and the peak of AEF increases. The specificity of Ag NS for enhancing a specific spontaneous emission is higher than Au NS. In addition, Ag NS with a smaller core has a larger AEF, while Au NS has an optimal radius of core (30Â nm) to obtain the maximum AEF. Moreover, the AEF is reduced, as the Stokes shift increases.
⺠Nanoshells (NSs) are narrowband enhancers on encapsulated emitter's emission. ⺠The average enhancement factors (AEF) of these nanocavities are analyzed. ⺠As the shell's thickness is thinner, the surface plasmon resonance of NS is red-shifted. ⺠The thinner the shell, the larger the AEF is.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 112, Issue 15, October 2011, Pages 2480-2485