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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 25 — Dec. 16, 2013
  • pp: 31469–31482

Subwavelength multiple focal spots produced by tight focusing the patterned vector optical fields

Mengqiang Cai, Chenghou Tu, Huihui Zhang, Shengxia Qian, Kai Lou, Yongnan Li, and Hui-Tian Wang  »View Author Affiliations


Optics Express, Vol. 21, Issue 25, pp. 31469-31482 (2013)
http://dx.doi.org/10.1364/OE.21.031469


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Abstract

We numerically and experimentally explored generation and regulation of subwavelength multiple focal spots produced by tight focusing patterned vector optical fields (PVOFs). We presented a modified Richard-Wolf diffraction integration method suitable for the tight focusing of the PVOFs. By tailoring the spatial geometry and the polarization distributions of the PVOFs, simulations show that the diverse spatial configurations of subwavelength multiple focal spots can be achieved. To verify our idea, we experimentally generated the theoretically calculated examples of femtosecond PVOFs, then tightly focused them on the surface of the crystalline silicon wafers, and finally characterized the morphologies of modified surfaces. The SEM (scanning electronic microscopy) images confirmed that the experimental results are in good agreement with the simulations. Based on the diverse controlling degrees of freedom of PVOFs, the resultant subwavelength focal fields are flexible and powerful in parallel processing, optical manipulation and so on.

© 2013 Optical Society of America

OCIS Codes
(220.4000) Optical design and fabrication : Microstructure fabrication
(260.1960) Physical optics : Diffraction theory
(260.5430) Physical optics : Polarization
(320.2250) Ultrafast optics : Femtosecond phenomena
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Physical Optics

History
Original Manuscript: October 15, 2013
Revised Manuscript: December 3, 2013
Manuscript Accepted: December 5, 2013
Published: December 13, 2013

Citation
Mengqiang Cai, Chenghou Tu, Huihui Zhang, Shengxia Qian, Kai Lou, Yongnan Li, and Hui-Tian Wang, "Subwavelength multiple focal spots produced by tight focusing the patterned vector optical fields," Opt. Express 21, 31469-31482 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-25-31469


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