Polarization of focal spot for high numerical aperture radially polarized beam

Yun Xiao; Yunhai Zhang; Jian Chang; Tongda Wei

doi:10.1117/12.2182014

13 April 2015 Polarization of focal spot for high numerical aperture radially polarized beam

Yun Xiao, Yunhai Zhang, Jian Chang, Tongda Wei

Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 95222L (2015) https://doi.org/10.1117/12.2182014
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

According to Wolf and Richards vectorial diffraction theory, an electric field intensity model of focal spot for high numerical aperture radially polarized beam is established to analyze the intensity distributions of the focal spot and the polarization components of the electric field along the x, y and z axis, separately. In the reflection-mode confocal of imaging system, the intensity distributions of focal spot is obtained utilizing the gold nanoparticles, and the intensity distributions of the polarization components of the electric field along the x, y and z axis are obtained utilizing the gold nanorods. In the incident light, the polarization component along the z axis is nonexistent in front of the objective. But there is the polarization component along the z axis, which is relative to the numerical aperture, in the focal spot behind the objective. When the numerical aperture increases from 0.8 to 1.4, the ratio of the polarization component maximum along the z axis to that along the x axis or y axis increases from 0.57 to 3.16. The results show that the focal spot of radially polarized beam through high numerical aperture objective have the polarization component along the x, y and z axis, separately, and polarization component along z axis is much more than the other.

Citation Download Citation

Yun Xiao, Yunhai Zhang, Jian Chang, and Tongda Wei "Polarization of focal spot for high numerical aperture radially polarized beam", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 95222L (13 April 2015); https://doi.org/10.1117/12.2182014

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KEYWORDS

Polarization

Objectives

Nanoparticles

Nanorods

Gold

Confocal microscopy

Optical imaging

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