Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Fabrication of bifocal holographic lenses by holographic polymer dispersed liquid crystal film

홀로그래픽 고분자 분산 액정을 이용한 홀로그램 이중 초점 렌즈 제작

  • Published : 2003.04.01
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Abstract

We Have fabricated a holographic polymer-dispersed liquid crystal (HPDLC) thin film, which is composed of multifunctional acrylate monomer blended with the nematic liquid crystal mixture, and then investigated the real-time diffraction efficiencies for various amounts of liquid crystals and applied AC electric fields. It is experimentally shown that the holographic gratings recorded in the HPDLC film can be reversibly erased and reconstructed by switching on and off an appropriate applied AC electric field. By use of these electro-optic properties we have developed bifocal holographic lenses having two different focal lengths of 30cm and 40 cm.

다기능성 아크릴레이트 단량체와 네마틱 액정 등을 혼합한 홀로그래픽 고분자 분산 액정 박막을 제작하고 액정의 농도와 피부에서 인가한 교류 전기장 등에 대한 실시간 회절효율을 측정하였다. WPDLC 박막에 기록된 홀로그램은 적절한 교류 전기장의 on/off에 의해 가역적으로 소거와 재생이 가능함을 보였다. 이러한 전기광학 특성을 이용하여 30 cm와 40 cm의 이중초점을 갖는 홀로그램 렌즈를 제작하였다.

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References

  1. R. L. Sutherland, V. P. Tondiglia, and L. V. Natarajan, 'Electrically switchable volume gratings in polymer-dis-persed liquid crystals,' Appl. Phys. Lett. vol. 64, pp. 1074 1994 https://doi.org/10.1063/1.110936
  2. Bunning, T. J. 'Morphology of Anisotropic Polymer-Dis-Persed Liquid Crystals and the Effect of Monomer Functionality,' Journal of polymer science. Part B, Polymer physics, vol. 35, pp 2825, 1997 https://doi.org/10.1002/(SICI)1099-0488(199712)35:17<2825::AID-POLB7>3.0.CO;2-P
  3. P.Mormile, L. Petti, M. Abbate, P. Musto, G. Ragosta, and P. Villano, 'Temperature switch and thermally induced optical bistability in a PDLC,' Opt. Comnun. vol. 147, pp.269, 1998 https://doi.org/10.1016/S0030-4018(97)00551-8
  4. Andy Y.-G. Fuh, T.-C. Ko, M.-S. Ysai, C.-Y. Huang, and L.-C. Chien, 'Dynamical studies of gratings formed in polymer-dispersed liquid crystal films,' J. Appl. Phys. vol. 83, no. 2,pp. 679, 1998 https://doi.org/10.1063/1.366738
  5. K. O. Hill, Y. Fujii, D. C. Johnson, and B. S. Kawasaki, 'Photosensitivity in optical fiber waveguides: Application to reflection filter fabrication,' Appl. Phys. Lett. vol. 32, pp. 647, 1978 https://doi.org/10.1063/1.89881
  6. C. C. Bowley, G. P. Crawford, and H. Yuan, 'Reflection from dual-domains in a holographically-formed polymerdispersed liquid crystal material,' Appl. Phys. Lett. vol. 74, pp. 3096, 1999 https://doi.org/10.1063/1.124073
  7. A. Riede, 'Structure of polymer networks in liquid crystals,' Liquid Crystals, vol. 22, pp. 157, 1997 https://doi.org/10.1080/026782997209513
  8. 남상엽, DVD와 CD/R/CD-RW 기술(우신출판사, 서울, 1999)
  9. P. Simoni, Nonlinear Optical Properties of Liquid Crystals and Polymer Dispersed Liquid Crystals (World Scientific, Singapore, 1997)
  10. H. Kogelnik, Bell Syst. Tech. Journal. vol. 48, pp. 2909, 1969 https://doi.org/10.1002/j.1538-7305.1969.tb01198.x
  11. B. R. Brown and A. W. Lohmann, 'Complex spatial filtering with binary masks,' Appl. Opt. vol. 5, pp. 967, 1966 https://doi.org/10.1364/AO.5.000967
  12. A W. Lohmann and O. P. Paris, 'Binary Fraunhofer holograms, generated by computer,' Appl. Opt. vol. 5, pp. 1739, 1967 https://doi.org/10.1364/AO.6.001739
  13. J. J. Burch, 'A Computer Algorithm for the Synthesis of Spatial Frequency Filters,' Proc. IEEE. vol. 55, pp. 599, 1967 https://doi.org/10.1109/PROC.1967.5620
  14. 조현모, 이윤우, 이인원, 이상태, 이종웅, '칼날 주사방법에 의한 일차원 CCD의 MTF 측정' 한국광학회지, vol. 6, pp. 173, 1995