Redistributing the energy flow of tightly focused ellipticity-variant vector optical fields

Gao, Xu-Zhen; Pan, Yue; Zhang, Guan-Lin; Zhao, Meng-Dan; Ren, Zhi-Cheng; Tu, Chenghou; Li, Yongnan; Wang, Hui-Tian

doi:10.1364/prj.5.000640

Cited by 46 publications

(20 citation statements)

References 35 publications

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“…Although the expressions for the projections of the Poynting vector in Equation ( 11) are quite cumbersome, they allow us to make some significant general conclusions. From Equation (11), the longitudinal energy flow is seen to be radially symmetrical at any m, being ϕ-independent. The on-axis energy flow will be positive and non-zero only at m = 0 (linear polarization): P z (r = z = 0) = I 2 0,0 /4.…”

Section: Energy Flow At the Focus Of The Light With Hybrid Polarizationmentioning

confidence: 99%

“…Thus, we can infer that, similar to conventional 2ndorder azimuthal polarization of the incident light [33,34], for hybrid incident polarization, a reverse energy flow also occurs at m = ±2. From Equation (11) at ϕ = 0, we can derive:…”

Section: Energy Flow At the Focus Of The Light With Hybrid Polarizationmentioning

confidence: 99%

“…For simplicity, below, we analyze particular cases of Equation (11). From Equation ( 11), it also follows that at m = 0 (linear polarization), the transverse energy flow components equal zero at the focus: P x = P y = 0.…”

Section: Energy Flow At the Focus Of The Light With Hybrid Polarizationmentioning

confidence: 99%

“…Topics studied included the characteristics of a radially polarized electromagnetic field at the strong focus [ 2 , 3 , 4 , 5 ], and spin-orbital conversion at the strong focus of a circularly polarized wave [ 6 , 7 , 8 , 9 ]. Tightly focusing an elliptically polarized optical vortex has been studied [ 10 , 11 , 12 , 13 ], and a concept of cylindrical vector beams has been proposed [ 14 ], including both radially and azimuthally polarized beams. Studies of the focusing of promising beams with hybrid polarization have also been conducted [ 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Spin-Orbital Conversion of a Strongly Focused Light Wave with High-Order Cylindrical–Circular Polarization

Kotlyar

Stafeev

Козлова

et al. 2021

Sensors

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We discuss interesting effects that occur when strongly focusing light with mth-order cylindrical–circular polarization. This type of hybrid polarization combines properties of the mth-order cylindrical polarization and circular polarization. Reluing on the Richards-Wolf formalism, we deduce analytical expressions that describe E- and H-vector components, intensity patterns, and projections of the Poynting vector and spin angular momentum (SAM) vector at the strong focus. The intensity of light in the strong focus is theoretically and numerically shown to have an even number of local maxima located along a closed contour centered at an on-axis point of zero intensity. We show that light generates 4m vortices of a transverse energy flow, with their centers located between the local intensity maxima. The transverse energy flow is also shown to change its handedness an even number of times proportional to the order of the optical vortex via a full circle around the optical axis. It is interesting that the longitudinal SAM projection changes its sign at the focus 4m times. The longitudinal SAM component is found to be positive, and the polarization vector is shown to rotate anticlockwise in the focal spot regions where the transverse energy flow rotates anticlockwise, and vice versa—the longitudinal SAM component is negative and the polarization vector rotates clockwise in the focal spot regions where the transverse energy flow rotates clockwise. This spatial separation at the focus of left and right circularly polarized light is a manifestation of the optical spin Hall effect. The results obtained in terms of controlling the intensity maxima allow the transverse mode analysis of laser beams in sensorial applications. For a demonstration of the proposed application, the metalens is calculated, which can be a prototype for an optical microsensor based on sharp focusing for measuring roughness.

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Section: Energy Flow At the Focus Of The Light With Hybrid Polarizationmentioning

confidence: 99%

Section: Energy Flow At the Focus Of The Light With Hybrid Polarizationmentioning

confidence: 99%

Section: Energy Flow At the Focus Of The Light With Hybrid Polarizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spin-Orbital Conversion of a Strongly Focused Light Wave with High-Order Cylindrical–Circular Polarization

Kotlyar

Stafeev

Козлова

et al. 2021

Sensors

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show abstract

“…S1 in Supplementary information). Since our proposed designs can achieve complete polarization control within a simple design framework, the meta-atoms can be artificially arranged to spatially vary the degree of polarization and generate complex terahertz beam, such as ellipticity-variant vector fields [22].…”

Section: Introductionmentioning

confidence: 99%

Complete Terahertz Polarization Control With Broadened Bandwidth via Dielectric Metasurfaces

Wang

Song

Feng

et al. 2021

Preprint

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We demonstrate terahertz dielectric metasurfaces with anisotropic multipoles within the framework of the generalized Huygens principle, in which the interference among these multipoles achieves giant phase shift with broadened bandwidth and high transmission coefficients. More importantly, owing to the anisotropic design, various phase delays between π/2 and 3π/2 are obtained, which convert the incident linearly polarized terahertz wave into right/left-handed circularly polarized light, elliptically polarized light and cross polarized light. Both simulation and experimental results verify complete terahertz polarization control with the ellipticity ranging from 1 to -1, which paves a way for polarization–related applications of terahertz meta-devices.

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Generation of axially splitted ultra-long multiple optical needles/optical tubes using generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter

Thiruarul¹,

Charles²,

Lavanya³

et al. 2022

Opt Quant Electron

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Based on vector diffraction theory and annular Walsh function filter, axially splitted ultra-long multiple optical needles/optical tubes of electric as well as magnetic field distributions are numerically generated by generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter. This multiple optical structures can be conveniently tailored by properly tuning the initial phase of the Cylindrical vector beam(CVB) and Walsh order of the annular Walsh function filter. Furthermore, the effect of energy flux density(Poynting vector) as well as Spin angular momentum(SAM) distribution in the focal region are theoretically analyzed. We expect that such an axially splitted focal systems could be applicable in optical trapping and manipulation of multiple particles, optical super resolution microscopy etc.

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Redistributing the energy flow of tightly focused ellipticity-variant vector optical fields

Cited by 46 publications

References 35 publications

Spin-Orbital Conversion of a Strongly Focused Light Wave with High-Order Cylindrical–Circular Polarization

Spin-Orbital Conversion of a Strongly Focused Light Wave with High-Order Cylindrical–Circular Polarization

Complete Terahertz Polarization Control With Broadened Bandwidth via Dielectric Metasurfaces

Generation of axially splitted ultra-long multiple optical needles/optical tubes using generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter

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