Nonparaxial Propagation Properties of Specially Correlated Radially Polarized Beams in Free Space

Applied Sciences

Minghui Zhang¹  Lina Guo²  Li Chen²  Yangjian Cai³  Yahong Chen³  Yiming Dong⁴  Rong Lin⁵ 

[1] Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China;School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China;School of Physical Science and Technology, Soochow University, Suzhou 215006, China;School of Physics and Material Science, Anhui University, Hefei 230039, China;;Shandong Provincial Engineering and Technical Center of Light Manipulations &

关键词: nonparaxial propagation;    partially coherent beam;    polarization and coherence;   

DOI  :  10.3390/app9050997

来源: DOAJ

【 摘 要 】

A specially correlated radially polarized (SCRP) beam with unusual physical properties on propagation in the paraxial regime was introduced and generated recently. In this paper, we extend the paraxial propagation of an SCRP beam to the nonparaxial regime. The closed-form 3 × 3 cross-spectral density matrix of a nonparaxial SCRP beam propagating in free space is derived with the aid of the generalized Rayleigh–Sommerfeld diffraction integral. The statistical properties, such as average intensity, degree of polarization, and spectral degree of coherence, are studied comparatively for the nonparaxial SCRP beam and the partially coherent radially polarized (PCRP) beam with a conventional Gaussian–Schell-model correlation function. It is found that the nonparaxial properties of an SCRP beam are strikingly different from those of a PCRP beam. These nonparaxial properties are closely related to the correlation functions and the beam waist width. Our results may find potential applications in beam shaping and optical trapping in nonparaxial systems.

【 授权许可】

Unknown