LBNL, 1 Cyclotron Road, Berkeley, California 94720, USA.
PNNL, 902 Batelle Boulevard, Richland, Washington 99352, USA.
Phys Rev Lett. 2013 Feb 15;110(7):076802. doi: 10.1103/PhysRevLett.110.076802. Epub 2013 Feb 11.
In this Letter, we report on the efficient generation of electrons from metals using multiphoton photoemission by use of nanostructured plasmonic surfaces to trap, localize, and enhance optical fields. The plasmonic surface increases absorption over normal metals by more than an order of magnitude, and due to the localization of fields, this results in over 6 orders of magnitude increase in effective nonlinear quantum yield. We demonstrate that the achieved quantum yield is high enough for use in rf photoinjectors operating as electron sources for MHz repetition rate x-ray free electron lasers.
在这封信件中，我们报告了一种利用纳米结构等离激元表面来捕获、局域化和增强光场，从而实现多光子光电子发射高效产生电子的方法。该等离激元表面使金属的吸收增强了一个数量级以上，并且由于场的局域化，这导致有效非线性量子产率增加了六个数量级以上。我们证明，所达到的量子产率足以用于作为 MHz 重复率 X 射线自由电子激光的电子源运行的射频光电离注入器。
