Multichannel high extinction ratio polarized beam splitters based on metasurfaces

Abstract

Separating lights into different paths according to the polarization states while keeping their respective path's polarizations with high purification is keen for polarization multiplex in optical communications. Metallic nanowire gratings with multi-slits in a period are proposed to achieve polarized beam splitters (PBSs) in reflection and diffraction. The setting of multi-slits largely reduces the reflection of photons with a transverse magnetific field via the plasmonic waveguiding effect, which leads to highly polarized output lights with extinction ratio larger than 20 dB in each channel. The proposed reflection/diffraction PBSs enrich the approaches to control the polarization states with the advantages of wide incident angles and flexible beam splitting angles.

Robust and high‐speed rotation control in optical tweezers by using polarization synthesis based on heterodyne interference

“…The reported rotation control in optical trapping will find important applications in on chip micro-pumping, viscosity sensing, rotational manipulation in biophysical studies, and measurements of torque 1,[36][37][38] . It is also anticipated that the proposed polarization modulation method will benefit general research fields such as polarization sensitive imaging and spectroscopy [39][40][41][42][43][44][45][46] .…”

Generation of tunable superchiral spot in metal-insulator-metal waveguide

“…When the wavelength is 632.8 nm, the dielectric constants of the gold layers and air gap are ε Au = 12.997 1.0341i and ε 0 = 1. By solving the eigenequation of the MIM waveguide [19,20] , one can find that only one plasmonic mode can be supported. Because of the confinement of the gold layers, the plasmonic mode propagates only along the direction in the xy plane.…”

Chiral plasmonic nanostructure of twistedly stacked nanogaps

“…Nanogap structures, such as dimers, bowties, and pairs of semicircles and rods, can confine the electromagnetic field into the narrow gaps or at the sides of particles with different incident polarizations [9,10] . Due to this polarization-sensitive resonance, the chiral responsibility of nanogap structures is studied.…”