Constructing ultra-long focal fields via tightly focused Bessel beams

Zhaojin Guo; Mingshuai Huang; Sheng Liu; Peng Li; Bingyan Wei; Jianlin Zhao

doi:10.3788/COL202321.072601

Journals >Chinese Optics Letters >Volume 21 >Issue 7 >Page 072601 > Article

Chinese Optics Letters
Vol. 21, Issue 7, 072601 (2023)

Constructing ultra-long focal fields via tightly focused Bessel beams

Zhaojin Guo, Mingshuai Huang, Sheng Liu^*, Peng Li^**, Bingyan Wei, and Jianlin Zhao

Author Affiliations

Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China

show less

DOI: 10.3788/COL202321.072601 Cite this Article Set citation alerts

Zhaojin Guo, Mingshuai Huang, Sheng Liu, Peng Li, Bingyan Wei, Jianlin Zhao. Constructing ultra-long focal fields via tightly focused Bessel beams[J]. Chinese Optics Letters, 2023, 21(7): 072601 Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

Abstract

We numerically demonstrate that the tight focusing of Bessel beams can generate focal fields with an ultra-long depth of focus (DOF). The ultra-long focal field can be controlled by appropriately regulating the order of the Bessel function and the polarization. An optical needle and an optical dark channel with nearly

100 λ

DOF are generated. The optical needle has a DOF of

\sim 104.9 λ

and a super-diffraction-limited focal spot with the size of

0.19 λ^{2}

. The dark channel has a full-width at half-maximum of

\sim 0.346 λ

and a DOF of

\sim 103.8 λ

. Furthermore, the oscillating focal field with an ultra-long DOF can be also generated by merely changing the order of the input Bessel beam. Our results are expected to contribute to potential applications in optical tweezers, atom guidance and capture, and laser processing.

Keywords

Bessel beam depth of focus tight focusing vector beam

[\begin{matrix} E_{r} \\ E_{φ} \\ E_{z} \end{matrix}] = A \int_{0}^{θ_{\max}} l (θ) p (θ) \sqrt{\cos θ} \exp (i k z \cos θ) d θ,

(1)

View in Article

p = [\begin{matrix} \cos φ_{0} \sin θ \cos θ J_{1} (k r \sin θ) \\ \sin φ_{0} \sin θ J_{1} (k r \sin θ) \\ i \cos φ_{0} \sin^{2} θ J_{0} (k r \sin θ) \end{matrix}] .

(2)

View in Article

l (θ) = J_{β} (k f \sin θ) \exp (- α f \sin θ),

(3)

View in Article

Zhaojin Guo, Mingshuai Huang, Sheng Liu, Peng Li, Bingyan Wei, Jianlin Zhao. Constructing ultra-long focal fields via tightly focused Bessel beams[J]. Chinese Optics Letters, 2023, 21(7): 072601

Download Citation

EndNote(RIS)

BibTex

Plain Text

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information