Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements

详细信息    查看全文

• 作者：Arthur Losquin ; Luiz F. Zagonel ; Viktor Myroshnychenko ; Benito Rodr铆guez-Gonz谩lez ; Marcel Tenc茅 ; Leonardo Scarabelli ; Jens F枚rstner ; Luis M. Liz-Marz谩n ; F. Javier Garc铆a de Abajo ; Odile St茅phan ; Mathieu Kociak
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：February 11, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：1229-1237
• 全文大小：509K
• ISSN：1530-6992

文摘

Plasmon modes of the exact same individual gold nanoprisms are investigated through combined nanometer-resolved electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) measurements. We show that CL only probes the radiative modes, in contrast to EELS, which additionally reveals dark modes. The combination of both techniques on the same particles thus provides complementary information and also demonstrates that although the radiative modes give rise to very similar spatial distributions when probed by EELS or CL, their resonant energies appear to be different. We trace this phenomenon back to plasmon dissipation, which affects in different ways the plasmon signatures probed by these techniques. Our experiments are in agreement with electromagnetic numerical simulations and can be further interpreted within the framework of a quasistatic analytical model. We therefore demonstrate that CL and EELS are closely related to optical scattering and extinction, respectively, with the addition of nanometer spatial resolution.