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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 21 — Oct. 17, 2007
  • pp: 14078–14085

Electrically switchable and optically rewritable reflective Fresnel zone plate in dye-doped cholesteric liquid crystals

Ko-Ting Cheng, Cheng-Kai Liu, Chi-Lun Ting, and Andy Ying-Guey Fuh  »View Author Affiliations

Optics Express, Vol. 15, Issue 21, pp. 14078-14085 (2007)

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This work demonstrates a reflective Fresnel zone plate based on dye-doped cholesteric liquid crystals (DDCLC) using the photo-induced realignment technique. Illumination of a DDCLC film with a laser beam through a Fresnel-zone-plate mask yields a reflective lens with binary-amplitude structures - planar and focal conic textures, which reflect and scatter probed light, respectively. The formed lens persists without any external disturbance, and its focusing efficiency, analyzed using circularly polarized light, is ~ 23.7%, which almost equals the measured diffraction efficiency of the used Fresnel-zone-plate mask (~ 25.6%). The lens is thermally erasable, rewritable and switchable between focusing and defocusing states, upon application of a voltage.

© 2007 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(160.3710) Materials : Liquid crystals
(220.3620) Optical design and fabrication : Lens system design
(230.0230) Optical devices : Optical devices

ToC Category:
Diffraction and Gratings

Original Manuscript: September 4, 2007
Revised Manuscript: October 4, 2007
Manuscript Accepted: October 10, 2007
Published: October 11, 2007

Ko-Ting Cheng, Cheng-Kai Liu, Chi-Lun Ting, and Andy Y. Fuh, "Electrically switchable and optically rewritable reflective Fresnel zone plate in dye-doped cholesteric liquid crystals," Opt. Express 15, 14078-14085 (2007)

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