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Plasmonic nanogap structures studied via cathodoluminescence imaging
Author(s): Stephen J. Bauman; Qigeng Yan; Mourad Benamara; Joseph B. Herzog
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Paper Abstract

Cathodoluminescence makes use of the beam raster capabilities of a scanning electron microscope to excite electrons in a sample and collects the luminescent light to produce images or obtain spectra that can reveal useful information about the sample. This technique has been shown to be particularly interesting for studying the plasmonic oscillations of metallic nanostructures. A recently developed fabrication technique has allowed for the creation of sub-10 nm gaps between metallic nanostructures for use as plasmonically active samples that can be tailored for various potential applications. The high degree of control over the geometries capable of being fabricated via this nanomasking technique allow for unique types of structures that are otherwise difficult to fabricate. In this work, the plasmonic response of metallic structures separated by sub-10 nm gaps is studied via CL imaging. Hyperspectral images can demonstrate the effectiveness with which various geometries produce specific wavelength resonances. The results can be helpful in determining which structures are optimal for specific applications based on these resonances. Also, the images can help to guide future fabrication, as the plasmon modes become better understood.

Paper Details

Date Published: 25 August 2017
PDF: 6 pages
Proc. SPIE 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV, 1034607 (25 August 2017); doi: 10.1117/12.2274085
Show Author Affiliations
Stephen J. Bauman, Univ. of Arkansas (United States)
Qigeng Yan, Univ. of Arkansas (United States)
Mourad Benamara, Univ. of Arkansas (United States)
Joseph B. Herzog, Univ. of Arkansas (United States)


Published in SPIE Proceedings Vol. 10346:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV
Din Ping Tsai; Takuo Tanaka, Editor(s)

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