All-Optical Nanometric Switch Based on the Directional Scattering of Semiconductor Nanoparticles Articles uri icon

publication date

  • August 2015

start page

  • 19558

end page

  • 19564

issue

  • 33

volume

  • 119

international standard serial number (ISSN)

  • 1932-7447

electronic international standard serial number (EISSN)

  • 1932-7455

abstract

  • A structure based on a dimer of silicon nanoparticles, presenting directional scattering in the visible range, was studied as a new design of an all-optical switch. The combination of spherical nanoparticles satisfying, at the same incident wavelength, the zero-backward and the minimum-forward scattering conditions can produce either a maximum or a minimum of the scattered field in the area between the nanoparticles. The modulation of the incident wavelength can be used as a switching parameter due to the sensitivity of these conditions to it. An optimization of the dimer setup, both in the distance between the nanoparticles and the incident wavelength, was numerically performed to obtain a maximum contrast. Also, near-field and far-field distributions of the electric field have been considered.