Generation of optical needle with wavelength magnitude by tight focusing of circular partially coherent beams

Huichuan Lin; Yan Li; Ziyang Chen; Jixiong Pu

doi:10.1117/12.2533919

17 May 2019 Generation of optical needle with wavelength magnitude by tight focusing of circular partially coherent beams

Huichuan Lin, Yan Li, Ziyang Chen, Jixiong Pu

Author Affiliations +

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111703J (2019) https://doi.org/10.1117/12.2533919
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

Abstract

Based on Richards-Wolf vectorial diffraction integral, the expression of electric cross-spectral density matrix of linearly polarized circular partially coherent (LPCPC) beams, near the focus of a high numerical aperture (NA) objective, are derived. Numerical calculations are performed to show the influence of initial coherent length and NA of the objective, on the intensity distribution and degree of coherence of the LPCPC beams in the focal region. The results indicated that after focusing the LPCPC beams through a high NA objective a super-length optical needle (<12λ) with wavelength beam size can be obtained. Moreover, the numerical calculations illustrate that the length of the optical needle can be controlled by adjusting the initial coherent length of the LPCPC beams. The influence of NA of the objective on the length of the optical needle is much less than the initial coherent length. Setting the reference vector position on the z-axis, we can find that the coherence of the optical needle on the same wavefront remains unchanged.

Citation Download Citation

Huichuan Lin, Yan Li, Ziyang Chen, and Jixiong Pu "Generation of optical needle with wavelength magnitude by tight focusing of circular partially coherent beams", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111703J (17 May 2019); https://doi.org/10.1117/12.2533919

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