Chen Junyan, Zhang Fei, Zhang Ming, et al. Radially polarized Bessel lens based on all-dielectric metasurface[J]. Opto-Electronic Engineering, 2018, 45(11): 180124. doi: 10.12086/oee.2018.180124
Citation: Chen Junyan, Zhang Fei, Zhang Ming, et al. Radially polarized Bessel lens based on all-dielectric metasurface[J]. Opto-Electronic Engineering, 2018, 45(11): 180124. doi: 10.12086/oee.2018.180124

Radially polarized Bessel lens based on all-dielectric metasurface

    Fund Project: Supported by National Natural Science Fundation of China (61575032)
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  • In this paper, a radially polarized Bessel lens based on a dielectric metasurface is proposed. It can efficiently convert linearly polarized light into radially polarized light and simultaneously achieve non-diffracting Bessel beams. Under the incidence of linearly polarized light, the left and right handed components of linearly polarized light are independently regulated by the asymmetric photon spin-orbit interaction. Finally, polarization conversion and wavefront control are simultaneously achieved by spin recombination. At wavelength of 532 nm, the numerical aperture NA=0.9, and the metalenses achieve a focus focal spot beyond the diffraction limit. The study has potential applications in particle acceleration and super-resolution imaging.
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  • Overview:In the past few decades, cylindrical vector waves have received more and more attention due to their uniqueproperties in focusing and imaging, especially radial polarized light (RPL). RPL is an axisymmetrically polarized beamwith a strong longitudinal component in the focal plane, which allows RPL focusing to produce a tighter focal spot.Nowadays, it has been reported that RPL can be used to realize metalenses. However, most of the common metalensesbased on RPL use spherical phase gradient to design the lens, which results in the influence of diffraction. The full widthat half maximum (FWHM) of the focused spot cannot exceed the diffraction limit. Bessel non-diffracting beam is abeam with the advantages of small center spot, high concentration of light intensity, good directivity, and maximumnon-diffraction distance. Although many studies have been conducted on non-diffracted beams today, no existed metalen can combine the advantages of these two types of beams. In order to design a metalens that exceeds the diffractionlimit, a RPL Bessel lens based on a dielectric metasurface is proposed in this paper. It can efficiently convert linearlypolarized light into radially polarized light and simultaneously achieve non-diffracting Bessel beams. In order to achievesuch design, we need to control the polarization and phase of the incident beam at the same time. In this paper, asymmetric photon spin-orbit interaction is used to achieve arbitrary control of wavefront phase and polarization state simultaneously. Photon SOI describes the coupling relationship between photon spin angular momentum (SAM) andorbital angular momentum (OAM) during light transmission. By separately controlling the size and rotation of the unitcell, the phase and the geometric phase of the waveguide can be introduced at the same time. The combination of thetwo phase gradients can realize the asymmetric photon SOI and further realize independent control of the LCPL and theRCPL. This feature can be used to achieve arbitrary independence. Under linearly polarized light, the left and righthanded components of linearly polarized light are independently regulated by the asymmetric photon SOI. Polarizationconversion and wavefront control are simultaneously achieved by spin recombination. In this paper, the RPL Besselfocusing and RPL spherical focusing simulation results are compared with each other, the FWHM of the two lenses isapproximately 360 nm and 315 nm, respectively. Comparing the simulation results, the RPL Bessel focus has a smallerfocal spot and exceeds the diffraction limit (the diffraction limit is r=0.61λ/NA=360 nm).

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