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In an ideal situation, the SLM has both multi-level (analog) phase modulation and a high frame rate. To this end, Stockley et al. proposed an analog optical phase modulator based on a combination of a ferroelectric liquid crystal layer and a polymer cholesteric liquid crystal in 1995. At this arrangement, the phase variation range is 1.95π. But the applied voltage is highly non-linear.
British researchers have found optical phase modulators based on the uniform electro-optical behavior of collimated chiral nematic liquid crystals based on uniformly arranged helix (ULH, Uniform Lying Helix). Applying an electric field of 4 V / μm at a temperature of 106 ° C, this structure can exhibit a complete 2π phase change and minimal amplitude intensity variation. This structure can be designed into an integrated device for a silicon spatial light modulator. Development has great potential. This research paper was published in the academic journal "NPG Asia Materials" of the Nature Publishing Group.