Probing Chirality with Inelastic Electron-Light Scattering.
Nano Lett
; 20(6): 4377-4383, 2020 06 10.
Article
en En
| MEDLINE
| ID: mdl-32383890
ABSTRACT
Circular dichroism spectroscopy is an essential technique for understanding molecular structure and magnetic materials; however, 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 subwavelength 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.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fotones
/
Electrones
Idioma:
En
Revista:
Nano Lett
Año:
2020
Tipo del documento:
Article
País de afiliación:
Alemania