| Autor: |
Harvey, Tyler R., Henke, Jan-Wilke, Kfir, Ofer, Lorenço-Martins, Hugo, Feist, Armin, de Abajo, F. Javier García, Ropers, Claus |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Nano Lett. 20 (2020) 4377-4383 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1021/acs.nanolett.0c01130 |
| Popis: |
Circular dichroism spectroscopy is an essential technique for understanding molecular structure and magnetic materials, but spatial resolution is limited by the wavelength of light, and sensitivity sufficient for single-molecule spectroscopy is challenging. We demonstrate that electrons can efficiently measure the interaction between circularly polarized light and chiral materials with deeply sub-wavelength resolution. By scanning a nanometer-sized focused electron beam across an optically-excited chiral nanostructure and measuring the electron energy spectrum at each probe position, we produce a high-spatial-resolution map of near-field dichroism. This technique offers a nanoscale view of a fundamental symmetry and could be employed as "photon staining" to increase biomolecular material contrast in electron microscopy. |
| Databáze: |
arXiv |
| Externí odkaz: |
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