Analog low-loss full-range phase modulation by utilizing a V-shaped switched ferroelectric liquid-crystal cell in reflective mode.
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 approximately 2pi 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 degrees instead of the desired 45 degrees , virtually pure 1.6pi rad phase modulation was obtained; the measured values agree very well with our numerical simulations of the real device.
Engström
David
D
Photonics Laboratory, Department of Microtechology and Nanoscience, Chalmers University of Technology, Goteborg, Sweden. david.engstrom@mc2.chalmers.se
Rudquist
Per
P
Bengtsson
Jörgen
J
D'havé
Koen
K
Galt
Sheila
S