Reverse and toroidal flux of light fields with both phase and polarization higher-order singularities in the sharp focus area

Kotlyar, V. V.; Stafeev, Sergey S.; Kovalev, A. A.

doi:10.1364/oe.27.016689

Cited by 77 publications

(41 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, the on-axis projection of the Poynting vector at the focus in Equation (11) will be non-zero and negative only at m = −2 or m = 2:

. Thus, we can infer that, similar to conventional 2nd-order azimuthal polarization of the incident light [ 33 , 34 ], for hybrid incident polarization, a reverse energy flow also occurs at

. From Equation (11) at φ = 0, we can derive:

…”

Section: Methodsmentioning

confidence: 80%

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

Kotlyar

Stafeev

Козлова

et al. 2021

Sensors

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Moreover, the on-axis projection of the Poynting vector at the focus in Equation (11) will be non-zero and negative only at m = −2 or m = 2:

. Thus, we can infer that, similar to conventional 2nd-order azimuthal polarization of the incident light [ 33 , 34 ], for hybrid incident polarization, a reverse energy flow also occurs at

. From Equation (11) at φ = 0, we can derive:

…”

Section: Methodsmentioning

confidence: 80%

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

Kotlyar

Stafeev

Козлова

et al. 2021

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…Using the expressions obtained previously for the electric and magnetic components of focused beams with different polarizations [ 29 , 30 , 31 , 32 , 33 ], it is possible to calculate the distributions at the focus of the intensity and the longitudinal component of the Poynting vector.…”

Section: Resultsmentioning

confidence: 99%

Minimal Focal Spot Size Measured Based on Intensity and Power Flow

Kotlyar

Stafeev

Zaitsev

2021

Sensors

Self Cite

View full text Add to dashboard Cite

It is shown, theoretically and numerically, that the distributions of the longitudinal energy flow for tightly focused light with circular and linear polarization are the same, and that the spot has circular symmetry. It is also shown that the longitudinal energy flows are equal for optical vortices with unit topological charge and with radial or azimuthal polarization. The focal spot has a minimum diameter (all other characteristics being equal), which is measured based on the intensity of an optical vortex with azimuthal polarization. The diameter of the focal spot calculated from the energy flow for light with circular or linear polarization is slightly larger (by a fraction of a percentage). The magnitude of the diameter based on the intensity plays a role in the interaction of light with matter, and the magnitude of the diameter based on the energy flux affects the resolution in optical microscopy which is crucial in sensorial applications.

show abstract

“…Ковалёв 1,2 , А.П. Порфирьев 1,2 , С.С. Стафеев 1, 2 1 ИСОИ РАН -филиал ФНИЦ «Кристаллография и фотоника» РАН, 443001, Россия, Самарская область, г. Самара, ул.…”

Section: передача спинового углового момента диэлектрической микрочастицеunclassified

“…Молодогвардейская, д. 151, 2 Самарский национальный исследовательский университет имени академика С.П. Королёва, 443086, Россия, Самарская область, г. Самара, Московское шоссе, д.…”

Section: передача спинового углового момента диэлектрической микрочастицеunclassified

“…В недавних работах авторов были теоретически обнаружены новые оптические эффекты в остром фокусе лазерного света с фазовой и поляризационной сингулярностями. Было обнаружено формирование обратного потока энергии вблизи фокуса на оптической оси [1] и тороидального потока энергии вокруг «тёмных колец» в плоскости фокуса, на которых поток энергии нулевой [2]. Был обнаружен эффект «углового трактора», когда на соседних световых кольцах в плоскости фокуса поперечный поток энергии направлен в разные стороны (по часовой и против часовой стрелки) [3].…”

Section: Introductionunclassified

See 1 more Smart Citation

Transfer of spin angular momentum to a dielectric particle

Kotlyar¹,

Nalimov²,

Kovalev³

et al. 2020

Computer Optics

View full text Add to dashboard Cite

We show here that in the sharp focus of a linearly polarized laser beam the spin vector flux has only transverse components (the effect of photonic wheels or photonic helicopter). For a linearly polarized optical vortex, the orbit-spin conversion leads to the appearance of both longitudinal and transverse components of the spin density vector in the focus. Spin-orbit conversion is experimentally demonstrated for a circularly polarized Gaussian beam when a transverse energy flux (orbital angular momentum) arises in the focus, which is transmitted to a microparticle and makes it rotate. Switching the handedness of circular polarization (from left to right) switches the microparticle rotation direction. It is also shown here that an azimuthally polarized vortex beam with an arbitrary integer topological charge generates in the focus a spin density vector that only has an axial component (pure magnetization), while the transverse spin flux is absent.

show abstract

Reverse and toroidal flux of light fields with both phase and polarization higher-order singularities in the sharp focus area

Cited by 77 publications

References 25 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

Minimal Focal Spot Size Measured Based on Intensity and Power Flow

Transfer of spin angular momentum to a dielectric particle

Contact Info

Product

Resources

About