Light scattering by correlated disordered assemblies of nanoantennas

Eslam El Shamy (1) , Julien Jaeck (1) , Riad Haïdar (2, 3) , Patrick Bouchon (1)

1 DOTA, ONERA, Université Paris Saclay (COmUE) [Palaiseau]
2 X - École polytechnique
3 ONERA, Université Paris Saclay (COmUE) [Palaiseau]

Optical nanoantennas are widely used to build absorbing metasurfaces with applications in photodetection, solar cells, and sensing. Most of the time, the nanoantennas are assembled as a periodic distribution, but there have been various works where disordered arrays are used, either to get rid of diffraction orders or due to a fabrication process that prevents any determined distribution. Here, we investigate both theoretically and experimentally the unavoidable scattering introduced by such disorders. By introducing a perturbation on the positions of 1D arrays of metal-insulator-metal (MIM) nanoantennas, the light is scattered rather than increasingly absorbed. The scattering occurs only in the plane of incidence and on a given spectral range. We show how this scattering can be manipulated from 0% to 55% of the incoming light.

Mots clés: REFLECTIVITY SPECTRA; PLASMONICS; INFRARED OPTICS; LIGHT SCATTERING; METAMATERIALS; NANOANTENNA; DISORDER

Mots clés: DESORDRE; DIFFUSION; NANOANTENNES

Domaines: Optique / photonique

Eslam El Shamy, Julien Jaeck, Riad Haïdar, Patrick Bouchon. Light scattering by correlated disordered assemblies of nanoantennas. Applied Physics Letters, 2019, 115 (4), pp.041103. ⟨10.1063/1.5097461⟩. ⟨hal-02296871⟩