Plasmonic gold helices for the visible range fabricated by oxygen plasma purification of electron beam induced deposits
Haverkamp C, Hoeflich K, Jaeckle S, Manzoni A, Christiansen S (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 28
Article Number: 055303
Journal Issue: 5
DOI: 10.1088/1361-6528/28/5/055303
Abstract
Electron beam induced deposition (EBID) currently provides the only direct writing technique for truly three-dimensional nanostructures with geometrical features below 50 nm. Unfortunately, the depositions from metal-organic precursors suffer from a substantial carbon content. This hinders many applications, especially in plasmonics where the metallic nature of the geometric surfaces is mandatory. To overcome this problem a post-deposition treatment with oxygen plasma at room temperature was investigated for the purification of gold containing EBID structures. Upon plasma treatment, the structures experience a shrinkage in diameter of about 18 nm but entirely keep their initial shape. The proposed purification step results in a core-shell structure with the core consisting of mainly unaffected EBID material and a gold shell of about 20 nm in thickness. These purified structures are plasmonically active in the visible wavelength range as shown by dark field optical microscopy on helical nanostructures. Most notably, electromagnetic modeling of the corresponding scattering spectra verified that the thickness and quality of the resulting gold shell ensures an optical response equal to that of pure gold nanostructures.
Involved external institutions
Germany (DE)How to cite
APA:
Haverkamp, C., Hoeflich, K., Jaeckle, S., Manzoni, A., & Christiansen, S. (2017). Plasmonic gold helices for the visible range fabricated by oxygen plasma purification of electron beam induced deposits. Nanotechnology, 28(5). https://doi.org/10.1088/1361-6528/28/5/055303
MLA:
Haverkamp, Caspar, et al. "Plasmonic gold helices for the visible range fabricated by oxygen plasma purification of electron beam induced deposits." Nanotechnology 28.5 (2017).
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