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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 15 — May. 20, 2009
  • pp: 2903–2914

Operational modes of a ferroelectric LCoS modulator for displaying binary polarization, amplitude, and phase diffraction gratings

Antonio Martínez-García, Ignacio Moreno, María M. Sánchez-López, and Pascuala García-Martínez  »View Author Affiliations


Applied Optics, Vol. 48, Issue 15, pp. 2903-2914 (2009)
http://dx.doi.org/10.1364/AO.48.002903


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Abstract

We analyze the performance of a ferroelectric liquid crystal on silicon display (FLCoS) as a binary polarization diffraction grating. We analyze the correspondence between the two polarization states emerging from the displayed grating and the polarization and intensity of the diffracted orders generated at the Fourier diffraction plane. This polarization-diffraction analysis leads, in a simple manner, to configurations yielding binary amplitude or binary phase modulation by incorporating an analyzer on the reflected beam. Based on this analysis, we present two useful variations of the polarization configuration. The first is a simplification using a single polarizer, which provides equivalent results for amplitude or phase modulation as the more general operational mode involving two polarizers. The second variation is proposed to compensate the reduction of the diffraction efficiency when the operating wavelength differs from the design one (for which the FLCoS liquid-crystal layer acts as a half-wave plate). In this situation we show how the ideal grating performance can be recovered in spite of the phase-shift mismatch originated by chromatic dispersion. In all cases, we provide experimental results that verify the theoretical analyses.

© 2009 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(230.0230) Optical devices : Optical devices
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

History
Original Manuscript: February 18, 2009
Revised Manuscript: April 2, 2009
Manuscript Accepted: April 28, 2009
Published: May 15, 2009

Citation
Antonio Martínez-García, Ignacio Moreno, María M. Sánchez-López, and Pascuala García-Martínez, "Operational modes of a ferroelectric LCoS modulator for displaying binary polarization, amplitude, and phase diffraction gratings," Appl. Opt. 48, 2903-2914 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-15-2903


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