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Chinese Optics Letters

Chinese Optics Letters


  • Editor: Zhizhan Xu
  • Vol. 11, Iss. 5 — May. 1, 2013
  • pp: 052601–

Polarization and amplitude hybrid modulation of longitudinally polarized subwavelength-sized optical needle

Lijiao Guo, Changjun Min, Shibiao Wei, and Xiaocong Yuan  »View Author Affiliations

Chinese Optics Letters, Vol. 11, Issue 5, pp. 052601- (2013)

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We present a method of both polarization and amplitude modulations on an incident beam to obtain a longitudinally polarized subwavelength-sized optical needle. A 4-f system with a spatial light modulator is used to generate experimentally a two-mode alternate cylindrical vector beam by polarization modulation, enhancing performance and facilitating implementation. We optimize the beam focusing properties after passing the beam through an annular aperture to obtain amplitude modulation by the simulated annealing algorithm. Numerical results indicate that a sharp focal spot (0.417λ) with a long focal depth (8λ) and a strong longitudinally polarized field can be easily achieved.

© 2013 Chinese Optics Letters

OCIS Codes
(140.3300) Lasers and laser optics : Laser beam shaping
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

Lijiao Guo, Changjun Min, Shibiao Wei, and Xiaocong Yuan, "Polarization and amplitude hybrid modulation of longitudinally polarized subwavelength-sized optical needle," Chin. Opt. Lett. 11, 052601- (2013)

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