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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 15 — Jul. 29, 2013
  • pp: 18079–18088

An endoscopic system adopting a liquid crystal lens with an electrically tunable depth-of-field

Hung-Shan Chen and Yi-Hsin Lin  »View Author Affiliations


Optics Express, Vol. 21, Issue 15, pp. 18079-18088 (2013)
http://dx.doi.org/10.1364/OE.21.018079


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Abstract

Conventional endoscopic systems consisting of several solid lenses suffer from a fixed and limited depth-of-field (DOF). For practical applications, conventional endoscopes mechanically change the distance between the solid lenses of a lens module in order to change the focusing plane and DOF to see clearly in a scene. In this paper, we demonstrate an electrically tunable endoscopic system adopting a liquid crystal lens. By means of tunable focusing properties of the LC lens as a positive lens and a negative lens, the object at different objective distances can be imaged to the image sensor clearly and the corresponding depth-of-field can also help to enlarge the total spatial depth perception in a scene. The optical mechanism is discussed. In the experiments, under adjustment of three discrete lens powers of the LC lens, the viewing range or total spatial depth perception of the endoscopic system is from 76.4 mm to 12.4 mm which is 2x improved compared to the conventional one without LC lens. We believe this study can be extended to the applications of industrial and medical endoscopes.

© 2013 OSA

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: May 31, 2013
Revised Manuscript: July 11, 2013
Manuscript Accepted: July 13, 2013
Published: July 19, 2013

Virtual Issues
Vol. 8, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Hung-Shan Chen and Yi-Hsin Lin, "An endoscopic system adopting a liquid crystal lens with an electrically tunable depth-of-field," Opt. Express 21, 18079-18088 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-15-18079


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References

  1. M. Q. Yang, S. W. Huang, W. K. Su, H. M. Feng, Z. Y. Chen, H. M. Wu, and Y. T. Kuo, “Optimizing the depth of field for short object distance of capsule endoscope,” Proc. SPIE6859, 68591Q, 68591Q-7 (2008). [CrossRef]
  2. M. Katz, Introduction to Geometrical Optics (World Scientific Publishing Co. Pte. Ltd., 2002).
  3. P. Rol, R. Jenny, D. Beck, F. Frankhauser, and P. F. Niederer, “Optical properties of miniatured endoscopes for ophthalmic use,” Opt. Eng.34(7), 2070–2077 (1995). [CrossRef]
  4. S. Kuiper, “Electrowetting-based liquid lenses for endoscopy,” Proc. SPIE7930, 793008, 793008-8 (2011). [CrossRef]
  5. X. Zeng, C. T. Smith, J. C. Gould, C. P. Heise, and H. Jiang, “Fiber endoscopes utilizing liquid tunable-focus microlenses actuated through infrared light,” J. of Microelectromechannical Systems20(3), 583–593 (2011). [CrossRef]
  6. S. W. Seo, S. Han, J. H. Seo, W. B. Choi, and M. Y. Sung, “Liquid lens module with wide field-of view and variable focal length,” Electronic Mater. Lett.6(4), 141–144 (2010). [CrossRef]
  7. S. W. Seo, S. Han, J. H. Seo, Y. M. Kim, M. S. Kang, N. K. Min, W. B. Choi, and M. Y. Sung, “Microelectromechanical-system-based variable-focus liquid lens for capsule endoscopes,” Jpn. J. Appl. Phys.48(5), 052404 (2009). [CrossRef]
  8. Y. H. Lin and H. S. Chen, “Electrically tunable-focusing and polarizer-free liquid crystal lenses for ophthalmic applications,” Opt. Express21(8), 9428–9436 (2013). [CrossRef] [PubMed]
  9. H. C. Lin and Y. H. Lin, “A fast response and large electrically tunable-focusing imaging system based on switching of two modes of a liquid crystal lens,” Appl. Phys. Lett.97(6), 063505 (2010). [CrossRef]
  10. H. C. Lin and Y. H. Lin, “An electrically tunable focusing pico-projector adopting a liquid crystal lens,” Jpn. J. Appl. Phys.49(10), 102502 (2010). [CrossRef]
  11. Y. H. Lin, M. S. Chen, and H. C. Lin, “An electrically tunable optical zoom system using two composite liquid crystal lenses with a large zoom ratio,” Opt. Express19(5), 4714–4721 (2011). [CrossRef] [PubMed]
  12. H. C. Lin, N. Collings, M. S. Chen, and Y. H. Lin, “A holographic projection system with an electrically tuning and continuously adjustable optical zoom,” Opt. Express20(25), 27222–27229 (2012). [CrossRef] [PubMed]
  13. Y. H. Lin, H. S. Chen, H. C. Lin, Y. S. Tsou, H. K. Hsu, and W. Y. Li, “Polarizer-free and fast response microlens arrays using polymer-stabilized blue phase liquid crystals,” Appl. Phys. Lett.96(11), 113505 (2010). [CrossRef]
  14. H. Gross, H. Zugge, M. Peschka, and F. Blechinger, Handbook of Optical Systems: Aberration Theory and Correction of Optical Systems (WILEY-VCH, 2007, Vol. 3).
  15. H. S. Chen and Y. H. Lin, “An electrically tunable endoscopic system by adding a liquid crystal lens to enlarge and shift depth-of field,” SPIE8828 (2013).
  16. B. Wang, M. Ye, and S. Sato, “Liquid crystal lens with focal length variable from negative to positive values,” IEEE Photon. Technol. Lett.18(1), 79–81 (2006). [CrossRef]
  17. M. Ye, B. Wang, M. Uchida, S. Yanase, S. Takahashi, M. Yamaguchi, and S. Sato, “Low-voltage-driving liquid crystal lens,” Jpn. J. Appl. Phys.49(10), 100204 (2010). [CrossRef]
  18. H. Ren and S. T. Wu, Introduction to Adaptive Lenses (John Wiley & Sons, 2012).
  19. H. C. Lin, M. S. Chen, and Y. H. Lin, “A review of electrically tunable focusing liquid crystal lenses,” Trans. Electr. Electron Mater.12(6), 234–240 (2011). [CrossRef]
  20. H. C. Lin and Y. H. Lin, “An electrically tunable focusing liquid crystal lens with built-in planar polymeric lens,” Appl. Phys. Lett.98(8), 083503 (2011). [CrossRef]
  21. R. El-Maksoud, L. Wang, J. M. Sasian, and V. S. Valencia, “Depth of field estimation: theory, experiment, and application,” Proc. SPIE7429, 74290W, 74290W-12 (2009). [CrossRef]
  22. P. Valley, D. L. Mathine, M. R. Dodge, J. Schwiegerling, G. Peyman, and N. Peyghambarian, “Tunable-focus flat liquid-crystal diffractive lens,” Opt. Lett.35(3), 336–338 (2010). [CrossRef] [PubMed]
  23. H. Ren, S. Xu, Y. Liu, and S. T. Wu, “Switchable focus using a polymeric lenticular microlens array and a polarization rotator,” Opt. Express21(7), 7916–7925 (2013). [CrossRef] [PubMed]
  24. H. C. Lin and Y. H. Lin, “An electrically tunable-focusing liquid crystal lens with a low voltage and simple electrodes,” Opt. Express20(3), 2045–2052 (2012). [CrossRef] [PubMed]
  25. H. Ren and S. T. Wu, “Inhomogeneous nanoscale polymer-dispersed liquid crystals with gradient refractive index,” Appl. Phys. Lett.81(19), 3537–3539 (2002). [CrossRef]
  26. D. E. Lucchetta, R. Karapinar, A. Manni, and F. Simoni, “Phase-only modulation by nanosized polymer-dispersed liquid crystals,” J. Appl. Phys.91(9), 6060–6065 (2002). [CrossRef]
  27. Y. H. Lin, H. Ren, and S. T. Wu, “Polarisation-independent liquid crystal devices,” Liquid Crystals Today17(1-2), 2–8 (2008). [CrossRef]
  28. H. Ren, Y. H. Lin, Y. H. Fan, and S. T. Wu, “Polarization-independent phase modulation using a polymer-dispersed liquid crystal,” Appl. Phys. Lett.86(14), 141110 (2005). [CrossRef]
  29. Y. H. Lin, H. Ren, Y. H. Fan, Y. H. Wu, and S. T. Wu, “Polarization-independent and fast-response phase modulation using a normal-mode polymer-stabilized cholesteric texture,” J. Appl. Phys.98(4), 043112 (2005). [CrossRef]
  30. H. Ren, Y. H. Lin, C. H. Wen, and S. T. Wu, “Polarization-independent phase modulation of a homeotropic liquid crystal gel,” Appl. Phys. Lett.87(19), 191106 (2005). [CrossRef]
  31. Y. Huang, C. H. Wen, and S. T. Wu, “Polarization-independent and submillisecond response phase modulators using a 90° twisted dual-frequency liquid crystal,” Appl. Phys. Lett.89(2), 021103 (2006). [CrossRef]
  32. Y. H. Lin, H. Ren, Y. H. Wu, Y. Zhao, J. Y. Fang, Z. Ge, and S. T. Wu, “Polarization-independent liquid crystal phase modulator using a thin polymer-separated double-layered structure,” Opt. Express13(22), 8746–8752 (2005). [CrossRef] [PubMed]
  33. H. Ren, Y. H. Lin, and S. T. Wu, “Polarization-independent and fast-response phase modulators using double-layered liquid crystal gels,” Appl. Phys. Lett.88(6), 061123 (2006). [CrossRef]
  34. Y. H. Lin and Y. S. Tsou, “A polarization independent liquid crystal phase modulation adopting surface pinning effect of polymer dispersed liquid crystals,” J. Appl. Phys.110(11), 114516 (2011). [CrossRef]
  35. Y. H. Lin, M. S. Chen, W. C. Lin, and Y. S. Tsou, “A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90 degree twisted cell,” J. Appl. Phys.112(2), 024505 (2012). [CrossRef]
  36. Y. S. Tsou, Y. H. Lin, and A. C. Wei, “Concentrating Photovoltaic System Using a Liquid Crystal Lens,” IEEE Photon. Technol. Lett.24(24), 2239–2242 (2012). [CrossRef]

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