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Full-Text Articles in Physics
Dynamics Of A Liquid-Crystal Variable Optical Prism Based On Pancharatnam Phase, Lei Shi, Paul F. Mcmanamon, Douglas Bryant, Ke Zhang, Philip J. Bos
Dynamics Of A Liquid-Crystal Variable Optical Prism Based On Pancharatnam Phase, Lei Shi, Paul F. Mcmanamon, Douglas Bryant, Ke Zhang, Philip J. Bos
Philip J. Bos
We consider the dynamics of a variable optical prism based on Pancharatnam phase. The device basics, using liquid crystals (LCs) as the electro-optical material, have been previously proposed. In this paper, we study the dynamics of discrete changes in the phase profile, and also continuous changes in the phase profile through acquired data and numerical modeling. We show that a design based on LCs whose dielectric anisotropy can change sign (as a function of frequency) allows continuous tuning with reasonable response times.
Design Considerations For High Efficiency Liquid Crystal Decentered Microlens Arrays For Steering Light, Lei Shi, Jianru Shi, Paul F. Mcmanamon, Philip J. Bos
Design Considerations For High Efficiency Liquid Crystal Decentered Microlens Arrays For Steering Light, Lei Shi, Jianru Shi, Paul F. Mcmanamon, Philip J. Bos
Philip J. Bos
We have investigated the causes of low efficiency for optical beam steering devices based on liquid crystal decentered microlens arrays (DLAs). We show that the efficiency is effected by the relative phase of light exiting the individual lenses, the imperfect focusing of small lenses due to diffraction, the aberrations related to off-axis light going through a lens, and the diffraction spreading of light beams going through the DLA structure. A high steering efficiency of over 94.4% is demonstrated by modeling the transmitted light through the DLA with scalar diffraction theory. We also propose modified phase profiles for the lenses that …