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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 9 — Apr. 23, 2012
  • pp: 9705–9712

Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming

Andrew Bañas, Darwin Palima, and Jesper Glückstad  »View Author Affiliations

Optics Express, Vol. 20, Issue 9, pp. 9705-9712 (2012)

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We report on a new beam-forming system for generating high intensity programmable optical spikes using so-called matched-filtering Generalized Phase Contrast (mGPC) applying two consumer handheld pico-projectors. Such a system presents a low-cost alternative for optical trapping and manipulation, optical lattices and other beam-shaping applications usually implemented with high-end spatial light modulators. Portable pico-projectors based on liquid crystal on silicon (LCoS) devices are used as binary phase-only spatial light modulators by carefully setting the appropriate polarization of the laser illumination. The devices are subsequently placed into the object and Fourier plane of a standard 4f-setup according to the mGPC spatial filtering configuration. Having a reconfigurable spatial phase filter, instead of a fixed and fabricated one, allows the beam shaper to adapt to different input phase patterns suited for different requirements. Despite imperfections in these consumer pico-projectors, the mGPC approach tolerates phase aberrations that would have otherwise been hard to overcome by standard phase projection.

© 2012 OSA

OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(100.1390) Image processing : Binary phase-only filters
(140.3300) Lasers and laser optics : Laser beam shaping
(070.6120) Fourier optics and signal processing : Spatial light modulators

ToC Category:
Fourier Optics and Signal Processing

Original Manuscript: January 26, 2012
Manuscript Accepted: April 3, 2012
Published: April 13, 2012

Andrew Bañas, Darwin Palima, and Jesper Glückstad, "Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming," Opt. Express 20, 9705-9712 (2012)

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  1. D. Palima, A. R. Bañas, G. Vizsnyiczai, L. Kelemen, P. Ormos, and J. Glückstad, “Wave-guided optical waveguides,” Opt. Express20(3), 2004–2014 (2012). [CrossRef] [PubMed]
  2. J. Glückstad, D. Palima, J. S. Dam, and I. Perch-Nielsen, “Dynamically reconfigurable multiple beam illumination based on optical correlation,” J. Opt. A, Pure Appl. Opt.11(3), 034012 (2009). [CrossRef]
  3. I. Perch-Nielsen, D. Palima, J. S. Dam, and J. Glückstad, “Parallel particle identification and separation for active optical sorting,” J. Opt. A, Pure Appl. Opt.11(3), 034013 (2009). [CrossRef]
  4. J. Glückstad and D. Palima, “Combining Generalized Phase Contrast with matched filtering into a versatile beam shaping approach,” J. Phys.: Conf. Ser.206, 012006 (2010). [CrossRef]
  5. J. Glückstad and D. Palima, “Generalized Phase Contrast: Applications in Optics and Photonics”, Springer Series in Optical Sciences, Vol. 146, 310 pp (2009).
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  9. S. Mias, I. G. Manolis, N. Collings, T. D. Wilkinson, and W. A. Crossland, “Phase-modulating bistable optically addressed spatial light modulators using wide-switching-angle ferroelectric liquid crystal layer,” Opt. Eng.44(1), 014003 (2005). [CrossRef]
  10. A. Martínez, N. Beaudoin, I. Moreno, M. D. M. Sánchez-López, and P. Velásquez, “Optimization of the contrast ratio of a ferroelectric liquid crystal optical modulator,” J. Opt. A, Pure Appl. Opt.8(11), 1013–1018 (2006). [CrossRef]
  11. R. W. Gerchberg and W. O. Saxton, “A practical algorithm for the determination of the phase from image and diffraction plane pictures,” Optik (Stuttg.)35, 237 (1972).
  12. M. Guizar-Sicairos and J. C. Gutiérrez-Vega, “Computation of quasi-discrete Hankel transforms of integer order for propagating optical wave fields,” J. Opt. Soc. Am. A21(1), 53–58 (2004). [CrossRef] [PubMed]
  13. J. Yamamoto and T. Iwai, “Spatial Stability of Particles Trapped by Time-Division Optical Tweezers,” Int. J. Optomechatronics3(4), 253–263 (2009). [CrossRef]
  14. H. Ulriksen, J. Thogersen, S. Keiding, I. R. Perch-Nielsen, J. S. Dam, D. Z. Palima, H. Stapelfeldt, and J. Glückstad, “Independent trapping, manipulation and characterization by an all-optical biophotonics workstation,” J. Eur. Opt. Soc. Rapid Publ.3, 08034 (2008).
  15. A. Bañas, D. Palima, F. Pedersen, and J. Glückstad, “Development of a compact Bio-Optofluidic Cell Sorter,” Proc. SPIE8274, 1–6 (2012).

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