Investigating the nature of chiral near-field interactions
| Autor: | Euan Hendry, Jake K. Eager, Simon A. R. Horsley, Ian R. Hooper, C. P. Gallagher, Alastair P. Hibbins, Samuel M. Hornett, Lauren E. Barr |
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| Rok vydání: | 2018 |
| Předmět: |
Electromagnetic field
Physics Condensed matter physics High Energy Physics::Lattice Metamaterial Near and far field 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Homogeneous 0103 physical sciences 010306 general physics 0210 nano-technology Chirality (chemistry) |
| Zdroj: | Physical Review B. 97 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.97.155418 |
| Popis: | In recent years, there have been reports of enhanced chiroptical interactions in the near-fields of antennas, postulated to be mediated by high spatial gradients in the electromagnetic fields. Here, using gigahertz experimentation, we investigate the nature of the chiral near-field generated by an array of staggered-rod antennas through its interaction with an array of aligned, subwavelength metallic helices. This allows us to eliminate many potential origins of enhancements, such as those associated with plasmon-exciton interactions, and search solely for enhancements due to the high spatial gradients in the chirality of the fields around chiral antennas (so-called `superchiral fields'). By comparing the strength of the chiral interaction with our helices to that of a homogeneous chiral layer with effective material parameters, we find that the strength of this chiral interaction can be predicted using a completely local effective medium approximation. This suggests no obvious enhancement in the chiral interaction in the near-field and indicates that nonlocal interactions are negligible in this system. |
| Databáze: | OpenAIRE |
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