Broadband telecom transparency of semiconductor-coated metal nanowires: more transparent than glass.


Metallic nanowires (NW) coated with a high permittivity dielectric are proposed as means to strongly reduce the light scattering of the conducting NW, rendering them transparent at infrared wavelengths of interest in telecommunications. Based on a simple, universal law derived from electrostatics arguments, we find appropriate parameters to reduce the scattering efficiency of hybrid metal-dielectric NW by up to three orders of magnitude as compared with the scattering efficiency of the homogeneous metallic NW. We show that metal@dielectric structures are much more robust against fabrication imperfections than analogous dielectric@metal ones. The bandwidth of the transparent region entirely covers the near IR telecommunications range. Although this effect is optimum at normal incidence and for a given polarization, rigorous theoretical and numerical calculations reveal that transparency is robust against changes in polarization and angle of incidence, and also holds for relatively dense periodic or random arrangements. A wealth of applications based on metal-NWs may benefit from such invisibility.

DOI: 10.1364/OE.21.022076

1 Figure or Table

Showing 1-10 of 37 references

An invisible metal-semiconductor photodetector

  • P Fan, U K Chettiar, L Cao, F Afshinmanesh, N Engheta, M L Brongersma
  • 2012
2 Excerpts