Shape invariant higher-order Bessel-like beams carrying orbital angular momentum

被引:17
|
作者
Ismail, Y. [1 ,2 ]
Khilo, N. [3 ]
Belyi, V. [3 ]
Forbes, A. [1 ,2 ]
机构
[1] Univ KwaZulu Natal, Sch Phys, ZA-4000 Durban, South Africa
[2] CSIR, Natl Laser Ctr, ZA-0001 Pretoria, South Africa
[3] NASB, B Stepanov Inst Phys, Minsk 220072, BELARUS
关键词
non-diffracting; Bessel beams; spatial light modulator; Laguerre-Gaussian beams; Bessel-like beams; orbital angular momentum; SELF-RECONSTRUCTION; LIGHT; LENS;
D O I
10.1088/2040-8978/14/8/085703
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We present a method for generating higher-order Bessel beams with z-dependent cone angles. Such fields, if engineered correctly, are shape invariant during propagation and thus do not suffer from a transition from a Bessel-shaped intensity profile in the near field to an annular ring in the far field. We demonstrate the production of such fields in the laboratory with an optical system comprising a combination of two axicons and a lens, allowing for control of the cone angle of the resulting field. While the resulting shape invariant fields are not perfectly non-diffracting, they do maintain many of the same properties as Bessel beams, including self-reconstruction.
引用
收藏
页数:12
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