Optical physics

Items 5

Optical physics

Enhanced Focus Shaping of Circularly Polarized Laguerre–Gaussian Vortex Beams Using a Binary Axicon

Hassan T. Al-Ahsab, Mingjian Cheng, Ibrahim G. H. Loqman, Shukri Kaid, Abdu A. Alkelly

885- 890

2025-06-30

DOI: 10.59628/jast.v3i3.1761

Abstract

The focus shaping of light beams is crucial for a range of optical applications, including trapping, imaging, and material processing. In this work, based on the vector diffraction theory, the focus shaping of a circularly polarized Laguerre–Gaussian vortex beam by a binary axicon was investigated. By analyzing the effects of beam parameters such as order p, topological charge m, truncation parameter β, and optical system characteristics including obstruction δ and NA, this study demonstrates how these factors influence the focal intensity distribution. By appropriately choosing specific parameters, different focal shapes, such as multifoci and double spots, were formed in the focal region of the binary axicon. The findings underscore the potential of binary axicons as versatile tools for advanced focus engineering in optical trapping and particle manipulation.

Keywords

Focus shaping Laguerre--Gaussian vortex beam Vector diffraction theory Circular polarization Binary axicon
How to Cite This Article
Hassan T. Al-Ahsab, Mingjian Cheng, Ibrahim G. H. Loqman, Shukri Kaid, Abdu A. Alkelly (2025). Enhanced Focus Shaping of Circularly Polarized Laguerre–Gaussian Vortex Beams Using a Binary Axicon. Sana'a University Journal of Applied Sciences and Technology, 885- 890. DOI: https://doi.org/10.59628/jast.v3i3.1761

Hassan T. Al-Ahsab, Mingjian Cheng, Ibrahim G. H. Loqman, Shukri Kaid, Abdu A. Alkelly . “Enhanced Focus Shaping of Circularly Polarized Laguerre–Gaussian Vortex Beams Using a Binary Axicon.” Sana'a University Journal of Applied Sciences and Technology, 2025, pp. 885- 890. https://doi.org/10.59628/jast.v3i3.1761. Accessed 20 Sep. 2026.

Hassan T. Al-Ahsab, Mingjian Cheng, Ibrahim G. H. Loqman, Shukri Kaid, Abdu A. Alkelly . 2025. “Enhanced Focus Shaping of Circularly Polarized Laguerre–Gaussian Vortex Beams Using a Binary Axicon.” Sana'a University Journal of Applied Sciences and Technology : 885- 890. DOI: https://doi.org/10.59628/jast.v3i3.1761

Hassan T. Al-Ahsab, Mingjian Cheng, Ibrahim G. H. Loqman, Shukri Kaid, Abdu A. Alkelly (2025) ‘Enhanced Focus Shaping of Circularly Polarized Laguerre–Gaussian Vortex Beams Using a Binary Axicon’, Sana'a University Journal of Applied Sciences and Technology, pp. 885- 890. doi: 10.59628/jast.v3i3.1761

@article{jast2025_art1761, author = {Hassan T. Al-Ahsab, Mingjian Cheng, Ibrahim G. H. Loqman, Shukri Kaid, Abdu A. Alkelly }, title = {Enhanced Focus Shaping of Circularly Polarized Laguerre–Gaussian Vortex Beams Using a Binary Axicon}, journal = {Sana'a University Journal of Applied Sciences and Technology}, year = {2025}, month = {June}, pages = {885- 890}, doi = {10.59628/jast.v3i3.1761}, url = {https://doi.org/10.59628/jast.v3i3.1761},}

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Enhanced Focus Shaping of Circularly Polarized Laguerre–Gaussian Vortex Beams Using a Binary Axicon

Hassan T. Al-Ahsab hassanahsab@yahoo.com

Mingjian Cheng mjcheng1@xidian.edu.cn

Ibrahim G. H. Loqman i.luqman@su.edu.ye

Shukri Kaid shukrekaid530@gmail.com

Abdu A. Alkelly Corresponding a.alkelly@su.edu.ye

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Intensity distribution of the partially coherent Gaussian Schell vortex beam diffracted by classical axicon

Shukri A. M. kaid, Hatim O. Al-Nadary, Mohammad S. Qusailah , Abdu A. Alkelly

197-204

2024-05-05

DOI: 10.59628/jast.v2i2.899

Abstract

Based on the mathematical framework of the partially coherent Gaussian Schell model vortex (PCGSMV) beam and the Huygens-Fresnel integral, we conducted a study to analyze the intensity distribution and depth of focus (DOF) of the PCGSMV beam as it propagates through a classical axicon. Our numerical results indicate the influence of factors such as the beam width, spatial degree of coherence, topological charge, and axicon base angle on the intensity distribution and DOF. In addition, we investigated the relationship between the beam spot size and propagation distance, as well as the effects of the spatial degree of coherence and propagation distance on the intensity profile. Our findings highlight the importance of the intensity values along the DOF for various applications, including the optical trapping and manipulation of micro-particles.

Keywords

Gaussian Schell model vortex beam Huygens-Fresnel integral depth of focus classical axicon
How to Cite This Article
Shukri A. M. kaid, Hatim O. Al-Nadary, Mohammad S. Qusailah , Abdu A. Alkelly (2024). Intensity distribution of the partially coherent Gaussian Schell vortex beam diffracted by classical axicon. Sana'a University Journal of Applied Sciences and Technology, 197-204. DOI: https://doi.org/10.59628/jast.v2i2.899

Shukri A. M. kaid, Hatim O. Al-Nadary, Mohammad S. Qusailah , Abdu A. Alkelly . “Intensity distribution of the partially coherent Gaussian Schell vortex beam diffracted by classical axicon.” Sana'a University Journal of Applied Sciences and Technology, 2024, pp. 197-204. https://doi.org/10.59628/jast.v2i2.899. Accessed 20 Sep. 2026.

Shukri A. M. kaid, Hatim O. Al-Nadary, Mohammad S. Qusailah , Abdu A. Alkelly . 2024. “Intensity distribution of the partially coherent Gaussian Schell vortex beam diffracted by classical axicon.” Sana'a University Journal of Applied Sciences and Technology : 197-204. DOI: https://doi.org/10.59628/jast.v2i2.899

Shukri A. M. kaid, Hatim O. Al-Nadary, Mohammad S. Qusailah , Abdu A. Alkelly (2024) ‘Intensity distribution of the partially coherent Gaussian Schell vortex beam diffracted by classical axicon’, Sana'a University Journal of Applied Sciences and Technology, pp. 197-204. doi: 10.59628/jast.v2i2.899

@article{jast2024_art899, author = {Shukri A. M. kaid, Hatim O. Al-Nadary, Mohammad S. Qusailah , Abdu A. Alkelly }, title = {Intensity distribution of the partially coherent Gaussian Schell vortex beam diffracted by classical axicon}, journal = {Sana'a University Journal of Applied Sciences and Technology}, year = {2024}, month = {May}, pages = {197-204}, doi = {10.59628/jast.v2i2.899}, url = {https://doi.org/10.59628/jast.v2i2.899},}

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Intensity distribution of the partially coherent Gaussian Schell vortex beam diffracted by classical axicon

Shukri A. M. kaid Corresponding shukekaid530@gmail.com

Hatim O. Al-Nadary hoalnadary@nu.edu.sa

Mohammad S. Qusailah m.qusailah@su.edu.ye

Abdu A. Alkelly a.alkelly@su.edu.ye

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Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres

G. A. Alakhaly, F. M. Thabit, M. A. Shukri

1222-1228

2025-10-28

DOI: 10.59628/jast.v3i5.2226

Abstract

Theoretically, this study investigates the optical forces induced by a pulsed LG_0l modes on nano-dielectric spheres with low and high refractive indices. We analyze how trapping efficiency depends on the particle’s refractive index and the beam’s azimuthal mode in terms of force magnitude, effective trapping region, and the number of trapping zones. The theoretical model considers dielectric spheres immersed in an oil medium and irradiated by the beam. The results demonstrate that a pulsed LG_0l beam achieves higher and more stable trapping efficiency for small azimuthal mode values, short pulse duration, and particles with high refractive indices. Theoretical analysis suggests that the LG_0l mode enables 2D trapping of particles with bottle-beam-like control.

Keywords

Laguerre–Gaussian beam Pulsed Beam Dipole Approximation Optical Force Trapping force Optical Manipulation
How to Cite This Article
G. A. Alakhaly, F. M. Thabit, M. A. Shukri (2025). Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres. Sana'a University Journal of Applied Sciences and Technology, 1222-1228. DOI: https://doi.org/10.59628/jast.v3i5.2226

G. A. Alakhaly, F. M. Thabit, M. A. Shukri . “Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres.” Sana'a University Journal of Applied Sciences and Technology, 2025, pp. 1222-1228. https://doi.org/10.59628/jast.v3i5.2226. Accessed 20 Sep. 2026.

G. A. Alakhaly, F. M. Thabit, M. A. Shukri . 2025. “Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres.” Sana'a University Journal of Applied Sciences and Technology : 1222-1228. DOI: https://doi.org/10.59628/jast.v3i5.2226

G. A. Alakhaly, F. M. Thabit, M. A. Shukri (2025) ‘Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres’, Sana'a University Journal of Applied Sciences and Technology, pp. 1222-1228. doi: 10.59628/jast.v3i5.2226

@article{jast2025_art2226, author = {G. A. Alakhaly, F. M. Thabit, M. A. Shukri }, title = {Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres}, journal = {Sana'a University Journal of Applied Sciences and Technology}, year = {2025}, month = {October}, pages = {1222-1228}, doi = {10.59628/jast.v3i5.2226}, url = {https://doi.org/10.59628/jast.v3i5.2226},}

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Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres

G. A. Alakhaly a.alakhaly@su.edu.ye

F. M. Thabit f.thabit@su.edu.ye

M. A. Shukri Corresponding mshukri@su.edu.ye

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$(a) Channel capacity versus the propagation distance for the different strength coefficients of the refractive index fluctuationsS values. (b) Channel capacity versus the propagation distance for different small length-scale factor values l0.$

Propagation Characteristics of Partially Coherent Pin-Like Vortex Beams in Turbulent Biological tissues

Wafa’a A.Al-Bahry, Hassan T. Al-Ahsab, Mohammed S. Qusailah, Abdu A. Alkelly

2424-2435

2026-07-28

DOI: 10.59628/jast.v4i7.3263

Abstract

This study examined the propagation characteristics of partially coherent pin-like optical (PCPO) vortex beams carrying orbital angular momentum (OAM) within turbulent biological tissues. The objective of this study was to assess the potential of these nanoparticles for deep-tissue optical communication and imaging. By incorporating the biological tissue turbulence spectrum into the analytical framework, we extended the established analytical expressions that describe the evolution of the OAM mode spectrum, spiral spectrum, and channel capacity of PCPO beams in inhomogeneous biological media, which were modeled using fractal-based turbulence power spectra. Numerical simulations were conducted for several representative tissues, including the upper dermis, deep dermis, liver parenchyma, and intestinal epithelium, to assess the impact of tissue heterogeneity parameters, spatial coherence length, and topological charge on beam stability. The findings indicate that the probability of OAM detection diminishes with propagation distance and increasing topological charge, whereas a greater spatial coherence length and larger characteristic heterogeneity length enhance the channel capacity. Biological tissues with higher fractal dimensions and lower correlation lengths exhibit more pronounced turbulence-induced degradation. When the coherence length exceeds approximately 10 μm, the detection probability becomes nearly invariant with distance, suggesting a regime of enhanced robustness. These results provide quantitative insights into the feasibility and limitations of employing partially coherent OAM beams for optical information transfer in biological tissues and offer theoretical guidance for designing OAM-based biomedical photonic systems.

Keywords

Pin-like optical Vortex beams Orbital angular momentum Biological tissues.
How to Cite This Article
Wafa’a A.Al-Bahry, Hassan T. Al-Ahsab, Mohammed S. Qusailah, Abdu A. Alkelly (2026). Propagation Characteristics of Partially Coherent Pin-Like Vortex Beams in Turbulent Biological tissues. Sana'a University Journal of Applied Sciences and Technology, 2424-2435. DOI: https://doi.org/10.59628/jast.v4i7.3263

Wafa’a A.Al-Bahry, Hassan T. Al-Ahsab, Mohammed S. Qusailah, Abdu A. Alkelly . “Propagation Characteristics of Partially Coherent Pin-Like Vortex Beams in Turbulent Biological tissues.” Sana'a University Journal of Applied Sciences and Technology, 2026, pp. 2424-2435. https://doi.org/10.59628/jast.v4i7.3263. Accessed 20 Sep. 2026.

Wafa’a A.Al-Bahry, Hassan T. Al-Ahsab, Mohammed S. Qusailah, Abdu A. Alkelly . 2026. “Propagation Characteristics of Partially Coherent Pin-Like Vortex Beams in Turbulent Biological tissues.” Sana'a University Journal of Applied Sciences and Technology : 2424-2435. DOI: https://doi.org/10.59628/jast.v4i7.3263

Wafa’a A.Al-Bahry, Hassan T. Al-Ahsab, Mohammed S. Qusailah, Abdu A. Alkelly (2026) ‘Propagation Characteristics of Partially Coherent Pin-Like Vortex Beams in Turbulent Biological tissues’, Sana'a University Journal of Applied Sciences and Technology, pp. 2424-2435. doi: 10.59628/jast.v4i7.3263

@article{jast2026_art3263, author = {Wafa’a A.Al-Bahry, Hassan T. Al-Ahsab, Mohammed S. Qusailah, Abdu A. Alkelly }, title = {Propagation Characteristics of Partially Coherent Pin-Like Vortex Beams in Turbulent Biological tissues}, journal = {Sana'a University Journal of Applied Sciences and Technology}, year = {2026}, month = {July}, pages = {2424-2435}, doi = {10.59628/jast.v4i7.3263}, url = {https://doi.org/10.59628/jast.v4i7.3263},}

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Propagation Characteristics of Partially Coherent Pin-Like Vortex Beams in Turbulent Biological tissues

Wafa’a A.Al-Bahry w.albahri@su.edu.ye

Hassan T. Al-Ahsab hassanahsab@yahoo.com

Mohammed S. Qusailah m.qusailah@su.edu.ye

Abdu A. Alkelly Corresponding a.alkelly@su.edu.ye

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Propagation intensity and phase distribution of a Partially Coherent Lorentz–Gauss Vortex Beam in a Gradient-Index Medium

Mohammed S. Qusailah, Abdu A. Alkelly, Wafa’a A. Al-Bahry

124-133

2024-05-05

DOI: 10.59628/jast.v2i2.897

Abstract

The study focused on examining the characteristics of partially coherent Lorentz-Gauss vortex beams in a medium featuring a gradient refractive index. The study employed the ABCD matrix, deriving analytical expressions for the cross-spectral density function based on the extended Huygens-Fresnel principle and the relationship between the Hermitian Gaussian function and Lorentz distribution. The findings revealed that the topological charge, coherence length, and gradient refractive index coefficient are pivotal factors influencing the beam’s behaviour in the medium. An increase in topological charge led to an expansion of the dark spot in intensity, while the gradient refractive index plays a crucial role in altering the size and shape of the intensity periodically in the medium and does not affect the dark spot in the middle of the beam. The findings from this study hold potential for applications in remote sensing and optical communications, making them valuable for further research endeavors.

Keywords

Partially Coherent Lorentz–Gauss Vortex Beam Gradient-Index Medium
How to Cite This Article
Mohammed S. Qusailah, Abdu A. Alkelly, Wafa’a A. Al-Bahry (2024). Propagation intensity and phase distribution of a Partially Coherent Lorentz–Gauss Vortex Beam in a Gradient-Index Medium. Sana'a University Journal of Applied Sciences and Technology, 124-133. DOI: https://doi.org/10.59628/jast.v2i2.897

Mohammed S. Qusailah, Abdu A. Alkelly, Wafa’a A. Al-Bahry . “Propagation intensity and phase distribution of a Partially Coherent Lorentz–Gauss Vortex Beam in a Gradient-Index Medium.” Sana'a University Journal of Applied Sciences and Technology, 2024, pp. 124-133. https://doi.org/10.59628/jast.v2i2.897. Accessed 20 Sep. 2026.

Mohammed S. Qusailah, Abdu A. Alkelly, Wafa’a A. Al-Bahry . 2024. “Propagation intensity and phase distribution of a Partially Coherent Lorentz–Gauss Vortex Beam in a Gradient-Index Medium.” Sana'a University Journal of Applied Sciences and Technology : 124-133. DOI: https://doi.org/10.59628/jast.v2i2.897

Mohammed S. Qusailah, Abdu A. Alkelly, Wafa’a A. Al-Bahry (2024) ‘Propagation intensity and phase distribution of a Partially Coherent Lorentz–Gauss Vortex Beam in a Gradient-Index Medium’, Sana'a University Journal of Applied Sciences and Technology, pp. 124-133. doi: 10.59628/jast.v2i2.897

@article{jast2024_art897, author = {Mohammed S. Qusailah, Abdu A. Alkelly, Wafa’a A. Al-Bahry }, title = {Propagation intensity and phase distribution of a Partially Coherent Lorentz–Gauss Vortex Beam in a Gradient-Index Medium}, journal = {Sana'a University Journal of Applied Sciences and Technology}, year = {2024}, month = {May}, pages = {124-133}, doi = {10.59628/jast.v2i2.897}, url = {https://doi.org/10.59628/jast.v2i2.897},}

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Propagation intensity and phase distribution of a Partially Coherent Lorentz–Gauss Vortex Beam in a Gradient-Index Medium

Mohammed S. Qusailah m.qusailah@su.edu.ye

Abdu A. Alkelly Corresponding a.alkelly@su.edu.ye

Wafa’a A. Al-Bahry w.albahri@su.edu.ye

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