| Autor: |
Wintz, Daniel, Ambrosio, Antonio, Zhu, Alexander Y., Genevet, Patrice, Capasso, Federico |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
ACS Photonics, 4, 22 (2017) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1021/acsphotonics.6b00758 |
| Popis: |
V-shaped nanoantennas are among the popular choices for the unit element of a metasurface, a nanostructured surface used for its ability to mold and control the wavefront of light. In general, the motivation for choosing the V-antenna as the unit element comes from its bimodal nature, where the introduction of the second mode offers extra control over the scattered wavefronts. Here, through near-field scanning optical microscopy, we study a 1D metastructure comprised of V-antennas in the context of generating asymmetric surface plasmon polariton (SPP) wavefronts. The key point is that the use of the V-antenna allows for the creation of a two-dimensional phase gradient with a single line of antennas, where the extra phase dimension offers additional control and allows for asymmetric features. Two different asymmetries are created: (1) SPP wavefronts that have different propagation directions on either side of the metastructure, and (2) SPP wavefront asymmetry through focusing: one side of the metastructure focuses SPP wavefronts, while the other side has diverging SPP wavefronts. |
| Databáze: |
arXiv |
| Externí odkaz: |
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