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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 22 — Oct. 25, 2010
  • pp: 22772–22780

Modulation of optical focusing by using optimized zone plate structures

Jia-Han Li, Chih-Hong Lin, Yao-Jen Tsai, Yi-Wei Cheng, and Tony Wen-Hann Sheu  »View Author Affiliations


Optics Express, Vol. 18, Issue 22, pp. 22772-22780 (2010)
http://dx.doi.org/10.1364/OE.18.022772


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Abstract

The focusing properties of the optimized zone plate structures which have upper and lower zones with different thicknesses are studied by the three-dimensional finite-difference time-domain method. Two kinds of materials are chosen, including silver representing metal and BK7 glass representing dielectric. An optimization algorithm is applied to tune the parameters of zone plate structures. Several optimized zone plate structures with smaller circular-shape focus are presented. By using the angular spectrum representation method, we found that the cases with smaller focal sizes have larger high-k components; however, the intensities of side lobes also become larger in comparison with the main beam. It is also found that the phase differences between different spatial field components can have the influences on focusing properties. A special case with two focuses is shown by changing the cost function of the same optimization algorithm. Our findings suggest that the optimized zone plate structures can reconstruct the light intensity distribution and have a great potential for the applications in imaging, lithography, and data storage.

© 2010 OSA

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(240.6680) Optics at surfaces : Surface plasmons
(050.1965) Diffraction and gratings : Diffractive lenses

ToC Category:
Diffraction and Gratings

History
Original Manuscript: July 23, 2010
Revised Manuscript: September 17, 2010
Manuscript Accepted: October 6, 2010
Published: October 13, 2010

Citation
Jia-Han Li, Chih-Hong Lin, Yao-Jen Tsai, Yi-Wei Cheng, and Tony Wen-Hann Sheu, "Modulation of optical focusing by using optimized zone plate structures," Opt. Express 18, 22772-22780 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-22-22772


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