Optical Sorting of a Plasmonic or Dielectric or Chiral Mie Object Using a Single Metasurface

Identifying an object, be it of dielectric or plasmonic or chiral nature, by only using light beam is familiarized as optical sorting. As far as is known, a single optical setup is not reported so far, where these three different kinds of Mie sized particles can exhibit completely distinct behaviors. Chemical-based sorting of these various types of particles is still considered as a notable industrial problem due to the use of very expensive chemicals. This work presents a novel all-optical technique to distinguish classes of nanoscale Mie objects by separately placing them over a metasurface consisting of double-lined gold nanostructures. The proposed setup promotes an effective on-chip material-based optical sorting of silica (a dielectric object), gold (a plasmonic object), and chiral nanospheres by generating a dual surface plasmon polariton (SPP) energized plasmonic complex field, which induces fully different behaviors in Mie scatterers having dissimilar material properties. For instance, when simple plane wave is imposed underneath the metasurface, plasmonic object experiences the counterintuitive optical pulling force, dielectric object experiences pushing force, whereas the chiral object experiences optical lateral force. The proposed optical setup may introduce a new method of all-optical sorting without using chemicals or costly materials.

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