2014-11-12
Experimental realization of a polarization-independent ultraviolet/visible coaxial plasmonic metamaterial
Publication
Publication
Nano Lett. , Volume 14 - Issue 11 p. 6356- 6360
We report the experimental realization of an optical metamaterial composed of a hexagonal array of coaxial plasmonic metal/insulator/metal waveguides that shows strong polarization-independent optical mode index dispersion in the ultraviolet/blue. The metamaterial is composed of silicon coaxes with a well-defined diameter in the range of 150-168 nm with extremely thin sidewalls (13-15 nm), embedded in a silver film, fabricated using a combination of electron beam lithography, physical vapor deposition, reactive ion etching, and focused ion beam polishing. Using a Mach-Zehnder interferometer the phase advance is measured on several metamaterial samples with different dimensions in the UV/visible part of the spectrum. For all geometries the spectral features as well as the geometry dependence of the data correspond well with numerical finite-difference time domain simulations and the calculated waveguide dispersion diagram, showing a negative mode index between 440 and 500 nm.
| Additional Metadata | |
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| ACS | |
| doi.org/10.1021/nl5028183 | |
| Nano Lett. | |
| Organisation | Photonic Materials |
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van de Haar, M., Maas, R. C., Schokker, A. H., & Polman, A. (2014). Experimental realization of a polarization-independent ultraviolet/visible coaxial plasmonic metamaterial. Nano Lett., 14(11), 6356–6360. doi:10.1021/nl5028183 |
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