Formation of optical needle by high NA lens axicon with dedicated complex spiral phase mask

Lalithambigai, K.; Anbarasan, P. M.; Rajesh, K. B.

doi:10.1007/s11082-014-0075-0

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…Radially polarized vortex beams have been effectively utilized to generate a range of focal shapes, including uniform long light tunnels [24], dark spots [25], and longitudinally polarized annular fields [26]. Similarly, the focusing of azimuthally polarized vortex beams has led to the creation of super-long transversely polarized optical needles [27,28], tightly confined focal spots [2], and various other focal shapes [29]. Notably, Khonina and Degtyarive made a significant discovery in their research, highlighting that diffractive axicons are the optimal optical elements for generating longitudinally polarized optical needles when circularly or radially polarized Gaussian vortex beams with high numerical aperture (NA) are employed as incident light sources [4].…”

Section: Introductionmentioning

confidence: 99%

Tight focusing of azimuthally polarized Laguerre–Gaussian vortex beams by diffractive axicons

Alkelly,

Al-Ahsab,

Cheng

et al. 2024

Phys. Scr.

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This study presents a comprehensive theoretical investigation into the focusing properties of azimuthally polarized Laguerre-Gaussian vortex (APLGV) beams when interacting with diﬀerent optical elements, including a linear axicon, binary axicon, and lens based on the Debye approximation. The research ﬁndings highlight the intriguing combination of polarization and vortex singularities within the APLGV beam, which result in distinctive focal shapes when interacting with these optical elements. The focal shapes achieved include multiple tightly focused spots and optical needles, which can be controlled by adjusting optical system parameters and beam characteristics such as the numerical aperture (NA), truncation parameter, beam order, and annular obstruction. These parameters can be carefully selected to achieve speciﬁc focal shapes with applications in multi-optical manipulation, particle acceleration, and trapping. By harnessing the unique properties of APLGV beams and optimizing the optical setup, researchers can explore new possibilities for advanced optical manipulation and control.

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Section: Introductionmentioning

confidence: 99%

Tight focusing of azimuthally polarized Laguerre–Gaussian vortex beams by diffractive axicons

Alkelly,

Al-Ahsab,

Cheng

et al. 2024

Phys. Scr.

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Generating sub-diffraction microwave needle beam for nondestructive testing by multifunctional transmissive metasurfaces

Feng,

Shi,

Jiao

et al. 2024

Journal of Applied Physics

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Sub-diffraction needle beams with high intensity, sub-diffraction focal size, and long depth of focus (DOF) have attracted many researchers’ attention. However, the traditional methods for needle beam generation typically require many devices, such as phase elements, amplitude filters, and lens, which leads to a complex and bulky system and unfavorable for their integration. To address these challenges, we use a single multifunctional transmissive metasurface to convert a linearly polarized plane wave into a needle beam in the microwave range. The guided wave inspired unit cells of the proposed metasurface is designed to simultaneously and independently modulate the polarization and phase of transmitted waves. By imposing the desired polarization and phase distributions on the metasurface, the proposed multifunctional transmissive metasurface can efficiently generate a needle beam with subdiffraction size and extended DOF at 10 GHz when it is illuminated by an x-polarized wave. The proposed metasurface is fabricated, and a sub-diffraction needle beam with good performance is obtained in our measurements. In addition, a proof-of-concept of a high-resolution nondestructive testing experiment based on our designed metasurface is accomplished. Our work is expected to have potential applications in nondestructive testing of materials and structures.

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Generation of needle beams through focusing of azimuthally polarized vortex beams by polarization-insensitive metasurfaces

Shen

Huang

et al. 2021

J. Opt. Soc. Am. B

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Needle beams are widely used in advanced applications due to their high intensity, high resolution, and extended depth of focus. In this work, the generation of needle beams through transmitting azimuthally polarized beams to polarization-insensitive metasurfaces is presented. Defocus phase profiles and annular apertures were adopted to obtain needle beams, respectively. A relatively long depth of focus ( 16.9 λ ) with subdiffraction beam size ( 0.41 λ ) was obtained. The introduction of metasurfaces can significantly simplify an optical system compared with traditional methods utilizing complex optical elements. This study may contribute to photolithography, microscopy, particle manipulation, and acceleration.

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Formation of optical needle by high NA lens axicon with dedicated complex spiral phase mask

Cited by 5 publications

References 24 publications

Tight focusing of azimuthally polarized Laguerre–Gaussian vortex beams by diffractive axicons

Tight focusing of azimuthally polarized Laguerre–Gaussian vortex beams by diffractive axicons

Generating sub-diffraction microwave needle beam for nondestructive testing by multifunctional transmissive metasurfaces

Generation of needle beams through focusing of azimuthally polarized vortex beams by polarization-insensitive metasurfaces

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