Metasurfaces
are artificial electromagnetic surfaces that consist
of subwavelength scatterers in an array configuration, exhibiting
exceptional abilities to manipulate electromagnetic waves. Based on
the metasurface concept, a novel beam splitter for a single-frequency
same-polarization light is proposed in the visible spectrum. Using
metal–dielectric–metal (MDM) scattering unit cells,
an array of the circular gold nanocylinders with two different diameters
is designed and fabricated on the surface which introduces phase discontinuity
on the scattering wavefronts. At 240 nm thick, the flat beam splitter
can efficiently reflect an incident wave toward two predesigned directions.
More importantly, the split angle and power distribution between these
two beams can be readily controlled by setting a proper incident angle.
Compared to conventional bulky optical components, the ability of
this metasurface-based beam splitter would be very desirable in integrated
optical systems.
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