Tight focusing properties of a circular partially coherent Gaussian beam

Lin, Hungyen; Zhou, Xiaoming; Chen, Ziyang; Sasaki, Osami; Li, Yan; Pu, Jixiong

doi:10.1364/josaa.35.001974

Cited by 12 publications

(7 citation statements)

References 35 publications

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“…Using a laser beam tightly focused with a high-numerical-aperture (NA) objective, sub-wavelength focal spots or focal holes in the focal region can be obtained. Specifically, by modulating the amplitude, the polarization, the phase or the spatial coherence of the incident laser beam appropriately, sub-wavelength focal spots of desired shapes in the focal region can be achieved [25][26][27][28][29][30]. These designated sub-wavelength focal patterns are widely used in optical data storage, microscopy, particle beam trapping and material processing.…”

Section: Introductionmentioning

confidence: 99%

Tight Focusing of Circular Partially Coherent Radially Polarized Circular Airy Vortex Beam

Wan,

Wang,

Huang

et al. 2023

Photonics

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The tight focusing properties of circular partially coherent radially polarized circular Airy vortex beams (CPCRPCAVBs) are theoretically studied in this paper. After deriving the cross-spectral density matrix of CPCRPCAVBs in the focal region of a high-NA objective, numerical calculations were performed to indicate the influence of the topological charge of the vortex phase on intensity distribution, degree of coherence and degree of polarization of the tightly focused beam. An intensity profile along the propagation axis shows that a super-length optical needle (~15 λ) can be obtained with a topological charge of 1, and a super-length dark channel (~15 λ) is observed with a topological charge of 2 or 3. In the focal plane, the rise in the number of topological charge does not distort the shapes of the coherence distribution pattern and the polarization distribution pattern, but enlarges their sizes.

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Section: Introductionmentioning

confidence: 99%

Tight Focusing of Circular Partially Coherent Radially Polarized Circular Airy Vortex Beam

Wan,

Wang,

Huang

et al. 2023

Photonics

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“…In [ 38 , 39 ] nonparaxial propagation of vector partially coherent beams are considered. It is well known that nonparaxial effects significantly affect the characteristics of tightly focused beams [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. Tightly focused beams find important applications in optical data storage, microscopy, particle trapping, etc.…”

Section: Introductionmentioning

confidence: 99%

Nonparaxial Propagation of Bessel Correlated Vortex Beams in Free Space

Petrov

2022

Micromachines

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The nonparaxial propagation of partially coherent beams carrying vortices in free space is investigated using the method of decomposition of the incident field into coherent diffraction-free modes. Modified Bessel correlated vortex beams with the wavefront curvature are introduced. Analytical expressions are presented to describe the intensity distribution and the degree of coherence at different distances. The evolution of the intensity distribution during beam propagation for various source parameters is analyzed. The effects of nonparaxiality in the propagation of tightly focused coherent vortex beams are analyzed.

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“…These beam-shaping schemes are desirable for many applications, such as optical data storage, microscope, particle capture, and material processing. Thus, many research efforts have been made to study the tight-focusing properties of the laser beams of different types in these years [16][17][18][19][20][21][22][23][24]. Considering the self-focusing property and unique phase structure of CPRPB, it will be a significant work to explore its tight-focusing properties.…”

Section: Introductionmentioning

confidence: 99%

Tight Focusing Properties of Ring Pearcey Beams with a Cross Phase

Huang

et al. 2022

Photonics

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We theoretically investigated the properties of tightly focused ring Pearcey beams with a cross phase (CPRPB). The expressions of the distributions of both electric field and magnetic field in the focal region of an objective were first derived from the vectorial Debye theory, and then numerical calculations were carried out to obtain the focused intensity distribution and the Poynting vector of CPRPB near the focus. Numerical calculations indicate that as CPRPB is focused on an objective of high numerical aperture (NA), two nonuniform self-focusing spots occur at both sides of the geometrical focus of the objective symmetrically, and the angle between their directions is 90 degrees. The stronger is the strength of cross-phase modulation, the flatter are the ellipses of the self-focusing spots, and the smaller is the intensity at the geometrical focus of the objective. Numerical calculations also demonstrate that the optical gradient force produced by tightly focused CPRPB in the focal region can be manipulated in magnitude and in direction by tuning the strength of cross-phase modulation. Due to these properties of tightly focused CPRPB, they might find applications in the manipulation of micro- and nanoparticles and so on.

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Tight focusing properties of a circular partially coherent Gaussian beam

Cited by 12 publications

References 35 publications

Tight Focusing of Circular Partially Coherent Radially Polarized Circular Airy Vortex Beam

Tight Focusing of Circular Partially Coherent Radially Polarized Circular Airy Vortex Beam

Nonparaxial Propagation of Bessel Correlated Vortex Beams in Free Space

Tight Focusing Properties of Ring Pearcey Beams with a Cross Phase

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