Focal pattern evolution of radially polarized Lorentz-Gaussian vortex beam

Miao, Yu; Wang, Guanxue; Zhan, Qiwen; Sui, Guorong; Zhang, Rongfu; Lu, Xinmiao; Gao, Xiumin

doi:10.1016/j.ijleo.2016.10.029

Cited by 10 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Its properties including the beam propagation factor, the kurtosis parameter, the focusing, the tunable optical gradient force, and the Wigner distribution have been studied. [20][21][22][23][24][25] Propagations of Lorentz-Gauss vortex beams in free space, in a turbulent atmosphere, and in a uniaxial crystal have also been demonstrated. [26][27][28] However, the major advantage of a Lorentz-Gauss vortex beam is that it carries the orbital angular momentum.…”

Section: Introductionmentioning

confidence: 94%

Orbital angular momentum density and spiral spectra of Lorentz–Gauss vortex beams passing through a single slit

Zhou

2017

Chinese Phys. B

View full text Add to dashboard Cite

Based on the Hermite-Gaussian expansion of the Lorentz distribution and the complex Gaussian expansion of the aperture function, an analytical expression of the Lorentz-Gauss vortex beam with one topological charge passing through a single slit is derived. By using the obtained analytical expressions, the properties of the Lorentz-Gauss vortex beam passing through a single slit are numerically demonstrated. According to the intensity distribution or the phase distribution of the Lorentz-Gauss vortex beam, one can judge whether the topological charge is positive or negative. The effects of the topological charge and three beam parameters on the orbital angular momentum density as well as the spiral spectra are systematically investigated respectively. The optimal choice for measuring the topological charge of the diffracted Lorentz-Gauss vortex beam is to make the single slit width wider than the waist of the Gaussian part.

show abstract

Section: Introductionmentioning

confidence: 94%

Orbital angular momentum density and spiral spectra of Lorentz–Gauss vortex beams passing through a single slit

Zhou

2017

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…Artificially tailored wavefronts with such attributes can produce additional degrees of freedom that offer many novel applications in optical microscopy, [1,2] optical microfabrication, [3] and quantum information processing. [4] Various complex light field beams have been investigated, such as the radially polarized Lorentz-Gauss vortex beam [5] and the radially polarized Laguerre-Bessel-Gaussian beam. [6] Radially polarized beams have become an active research topic over the years because of their specific focusing characteristics [7,8] and potential applications in super resolution [9,10] and particle manipulation, [6] www.advopticalmat.…”

Section: Introductionmentioning

confidence: 99%

Generation of Radial Polarized Lorentz Beam with Single Layer Metasurface

Guo

Wang

et al. 2017

Advanced Optical Materials

View full text Add to dashboard Cite

as well as ultrafast phenomena sensing. [11] Practical applications for nondiffracted waves include light collimating, focusing, and shaping. [12][13][14] The Lorentz beam is a nondiffracted wave that is characterized by small size, long focal length, and extended transmission distance. [12] Typical techniques to produce Lorentz beams usually involve combinations of multiple optical elements. However, such systems are bulky, complicated, and inconvenient. To generate such novel beams simply, we employ a single layer metasurface device to modulate simultaneously the amplitude and polarization of the illuminating light. Metasurfaces are viewed as a kind of artificial material composed of periodic subwavelength metal or dielectric structures. When coupled resonantly to the electric and/or magnetic components of an incident electromagnetic field, they provide a spatially varying optical response (e.g., scattering amplitude, phase, and polarization). With the advantage of easy-etching, ultrathin as well as miniaturization, a broad range of applications of metasurfaces has been reported, including superlenses, [15,16] wave plates, [17][18][19] nonlinear optics, [20] and holograms. [21] However, these previous studies were focused on modulating one attribute of light beams, for example amplitude, phase or polarization. Several studies were reported to have modulated the phase [22] and polarization direction. [23] Only numerical simulations are carried out to demonstrate the ability of metasurface for multiple parameters modulation because double-layer structures [24] are difficult to fabricate. Traditionally, the concentric metal-ring wire grid is used to achieve radial polarization. [25][26][27] The structure is relatively simple but fails to generate amplitude modulation. Furthermore, circularly polarized light is required to generate radially polarized light; nevertheless, it comes accompanied by an unexpected vortex phase distribution. In this work, a designed metasurface is fabricated consisting of crosses of various sizes and orientations. The variation in size is employed to modulate the amplitude whereas variation in orientation is used to modulate the polarization distribution. With right/left circularly polarized (RCP/LCP) incidence, the output polarization may be radial or angular, whereas the amplitude obeys the Lorentz distribution. Nine cross structures were fabricated to achieve certain desired amplitude and polarization modulations. The polarization and amplitude distributions of the beam generated by the device are detected using a terahertz focal plane imaging system. A strong agreement between theoretical and experimental results was

show abstract