Open AccessOptimization-free approach for generating sub-diffraction quasi-non-diffracting beams
Author(s) -
Zhixiang Wu,
Kun Zhang,
Shuo Zhang,
Qijian Jin,
Zhongquan Wen,
Lingfang Wang,
Luru Dai,
Zhihai Zhang,
Hao Chen,
Gaofeng Liang,
Yuanyuan Liu,
Gang Chen
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.016585
Subject(s) - optics , diffraction , fresnel zone , fresnel diffraction , wavelength , planar , lens (geology) , materials science , physics , phase (matter) , diffraction efficiency , fresnel lens , angular spectrum method , computer graphics (images) , quantum mechanics , computer science
Sub-diffraction quasi-non-diffracting beams with sub-wavelength transverse size are attractive for applications such as optical nano-manipulation, optical nano-fabrication, optical high-density storage, and optical super-resolution microscopy. In this paper, we proposed an optimization-free design approach and demonstrated the possibility of generating sub-diffraction quasi-non-diffracting beams with sub-wavelength size for different polarizations by a binary-phase Fresnel planar lens. More importantly, the optimization-free method significantly simplifies the design procedure and the generation of sub-diffracting quasi-non-diffracting beams. Utilizing the concept of normalized angular spectrum compression, for wavelength λ 0 = 632.8 nm, a binary-phase Fresnel planar lens was designed and fabricated. The experimental results show that the sub-diffraction transverse size and the non-diffracting propagation distances are 0.40λ 0 -0.54λ 0 and 90λ 0 , 0.43λ 0 -0.54λ 0 and 73λ 0 , and 0.34λ 0 -0.41λ 0 and 80λ 0 for the generated quasi-non-diffracting beams with circular, longitudinal, and azimuthal polarizations, respectively.