光学镊子
光学
贝塞尔函数
贝塞尔光束
物理
衍射
基点
焦距
光学(聚焦)
极化(电化学)
镜头(地质)
化学
物理化学
作者
Zhaojin Guo,Mingshuai Huang,Sheng Liu,Peng Li,Bingyan Wei,Jianlin Zhao
出处
期刊:Chinese Optics Letters
[Shanghai Institute of Optics and Fine Mechanics]
日期:2023-01-01
卷期号:21 (7): 072601-072601
标识
DOI:10.3788/col202321.072601
摘要
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 100λ DOF are generated. The optical needle has a DOF of ∼104.9λ and a super-diffraction-limited focal spot with the size of 0.19λ2. The dark channel has a full-width at half-maximum of ∼0.346λ and a DOF of ∼103.8λ. 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.
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