期刊
NANO LETTERS
卷 16, 期 11, 页码 6832-6837出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02569
关键词
Plasmon propagation; plasmonic functional device; nanocircuitry; control; near-field imaging; photoemission electron microscope
类别
资金
- Deutsche Forschungsgesellschaft (DFG) within priority program Ultrafast Nano-optics [SPP 1391]
- Irish Research Council
- Marie Curie Actions ELEVATE fellowship
- [SFB/TRR 173: SPIN+X]
The design of noble-metal plasmonic devices and nanocircuitry requires a fundamental understanding and control of the interference of plasmonic modes. Here we report the first visualization of the propagation and interference of guided modes in a showcase plasmonic nanocircuit using normal-incidence nonlinear two-photon photoemission electron microscopy (PEEM). We demonstrate that in contrast to the commonly used grazing-incidence illumination scheme, normal-incidence PEEM provides a direct image of the structure's near-field intensity distribution due to the absence of beating patterns and despite the transverse character of the plasmonic modes. Based on a simple heuristic numerical model for the photoemission yield, we are able to model all experimental findings if global plane wave illumination and coupling to multiple input/output ports, and the resulting interference effects are accounted for.
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