Analog low-loss full-range phase modulation by utilizing a V-shaped switched ferroelectric liquid-crystal cell in reflective mode

David Engström; Per Rudquist; Jörgen Bengtsson; Koen D'havé; Sheila Galt

doi:10.1364/OL.31.002906

Analog low-loss full-range phase modulation by utilizing a V-shaped switched ferroelectric liquid-crystal cell in reflective mode

David Engström, Per Rudquist, Jörgen Bengtsson, Koen D’havé, and Sheila Galt

Optics Letters
Vol. 31,
Issue 19,
pp. 2906-2908
(2006)
•https://doi.org/10.1364/OL.31.002906

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David Engström, Per Rudquist, Jörgen Bengtsson, Koen D'havé, and Sheila Galt, "Analog low-loss full-range phase modulation by utilizing a V-shaped switched ferroelectric liquid-crystal cell in reflective mode," Opt. Lett. 31, 2906-2908 (2006)

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Related Topics
Table of Contents Category
- Optical Devices
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Phase modulation (120.5060)
- Liquid crystals (160.3710)
- Liquid-crystal devices (230.3720)
- Spatial light modulators (230.6120)
- Polarization (260.5430)

About this Article
History
- Original Manuscript: April 27, 2006
- Revised Manuscript: July 20, 2006
- Manuscript Accepted: July 22, 2006
- Published: September 11, 2006

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Abstract

We have studied the analog (V-shaped switching) mode in ferroelectric liquid crystals in reflective mode for analog phase modulation applications. We have found that several combinations of cell thicknesses and input polarization states exist for which near-lossless analog phase modulation with a range of $\sim 2 π rad$ is obtained, and we demonstrate one such combination experimentally. Despite a slight deviation from the ideal conditions, e.g., the tilt angle was 38° instead of the desired 45°, virtually pure $1.6 π rad$ phase modulation was obtained; the measured values agree very well with our numerical simulations of the real device.

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Case	1	2	3	4
d $(μ m)$	0.93	1.84	1.53	3.08
θ	45°	45°	38°	38°
$Γ_{v}$ $(ψ = \pm π ∕ 2)$	$0.514 π$	$1.017 π$	$0.845 π$	$1.702 π$
$Γ_{v}$ $(ψ = 0)$	$0.238 π$	$0.472 π$	$0.496 π$	$0.998 π$
$Γ_{r}$	0	$0.5 π$	$0.5 π$	$0.33 π$
$α_{r}$	—^b	45°	45°	0°
$χ_{in}^{(1, 2)}$ $(rad ∕ π)$	0.25	0.25	0.25	0.25
$φ_{in}^{(1)}$ $(rad ∕ π)$	0.771	0.785	0.760	0.680
$φ_{in}^{(2)}$ $(rad ∕ π)$	1.771	1.785	1.760	1.680
ϕ $(rad ∕ π)$	1.02	2.03	1.56	1.80
$Δ I$ (%)	$\pm 5.2$	$\pm 6.52$	$\pm 1.88$	$\pm 2.54$

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