Tight focusing of femtosecond elliptically polarised vortex light pulses

doi:10.1088/1674-1056/20/1/014202

Abstract This paper studies the tight focusing properties of femtosecond elliptically polarised vortex light pulses. Based on Richards–Wolf vectorial diffraction integral, the expressions for the electric field, the velocity of the femtosecond light pulse and the total angular momentum of focused pluses are derived. The numerical calculations are also given to illustrate the intensity distribution, phase contour, the group velocity variation and the total angular momentum near the focus. It finds that near the focus the femtosecond elliptically polarised vortex light pulse can travel at various group speeds, that is, slower or faster than light speed in vacuum, depending on the numerical aperture of the focusing objective system. Moreover, it also studies the influence of the numerical aperture of the focusing objective and the time duration of the elliptically polarised vortex light pulse on the total angular momentum distribution in the focused field.

Keywords: tight focusing ultrashort pulse elliptically polarised vectorial Debye integral

Received: 28 May 2010
Revised: 01 July 2010
Accepted manuscript online:

PACS:	42.25.Fx	(Diffraction and scattering)
	42.25.Ja	(Polarization)
	42.30.Kq	(Fourier optics)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60977068), the Natural Science Foundation of Fujian Province, China (Grant No. A0810012), and the Open Research Fund of State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences (Grant No. SKLST200912).

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Hua Li-Min(华黎闽),Chen Bao-Suan(陈宝算),Chen Zi-Yang(陈子阳),and Pu Ji-Xiong(蒲继雄) Tight focusing of femtosecond elliptically polarised vortex light pulses 2011 Chin. Phys. B 20 014202

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