Detecting cylindrical vector beams with an on-chip plasmonic spin-Hall metalens

Abstract

In recent years, singular optical beams, including optical vortex (OV) beams with phase singularities and cylindrical vector beams (CVBs) with polarization singularities, have brought new degrees of freedom for many applications. Although there have been various microscale devices for OV detection, the detection of CVBs with a microscale device is still a challenge. Here, we propose a new method for detection of CVBs with a designed on-chip plasmonic spin-Hall metalens structure. The focal position of the metalens and the splitting effect of at focus are studied in both an analytical model and numerical simulation. The results demonstrate that the metalens can not only detect different polarization orders of incident CVBs but also have an ability to distinguish radial, azimuthal and other vectorial polarization states under the same order of CVBs. This method has potential applications in compact integrated optical communication and processing systems.

Optical Force Effects of Rayleigh Particles by Cylindrical Vector Beams

“…In recent years, there has been an extensive exploration of cylindrical vector (CV) beams due to their spatially variant polarization orders [ 1 , 2 , 3 , 4 , 5 , 6 ]. Researchers have developed numerous systems for generating CV beams with exotic properties [ 7 , 8 , 9 , 10 , 11 , 12 ] and have applied them in various applications, such as optical manipulation [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ], the spin-orbit hall effect [ 20 , 21 , 22 ], multiplex communication [ 23 ], and super-resolution imaging [ 24 ]. These applications have sparked growing interest in the high numerical aperture (NA) focusing on the characteristics of CV beams and their properties in optical capture and manipulation.…”

Spin‐Switchable Optics for Surface Plasmon Polaritons Utilizing Nanogroove‐Pair Array

“…Numerous functional optical elements that rely on spin-controlled SPP excitation have already been DOI: 10.1002/adom.202301860 proposed and demonstrated, such as directional SPP couplers, [5][6][7][8][9][10] ultra-compact polarimeters, [11][12][13] phase/polarization singularity detectors, [14] circular polarization analyzer, [15] logic gates, [16] and plasmonic vortex lenses. [17][18][19][20][21][22] Current generation and in-plane manipulations of SPPs in a spin-controlled fashion are commonly achieved using rectangularshaped single groove/slit [23][24][25] or T-shaped groove/slit pair [26,27] as the basic units for spin-controlled SPP launching. However, these unit elements share a common limitation: they are primarily used to achieve only the required phase profiles by mediating the geometric phase, [28] lacking the ability to control the amplitude and phase independently because of strong amplitude-phase correlation.…”