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The multi-wavelength filters in the visible light band using the blue phase liquid crystal (BPLC) template was investigated. A multi-layer templated BPLC (T-BPLC) filter without intermediate dielectric layers was fabricated, which may reflect multi-wavelength in one filter. Compared with the cholesteric liquid crystal (CLC) filter, the T-BPLC filter may get a much narrower reflection bandwidth (<15 nm), show better angular stability of incident light, and have a more stable wavelength and bandwidth with a temperature shift. Furthermore, the central wavelength and bandwidth can be easily controlled by the fabrication process and the optimization of the material concentration. When the incident angle varies, the shift of the center wavelength of the T-BPLC filter is much smaller than that of the CLC filter. The multi-wavelength filter shows a potential application in color filters and high-density wavelength division multiplexed networks.

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The effect of chiral polymer network in polymer-stabilized blue phase liquid crystals (PS-BPLCs) was investigated. Compare with the conventional polymer network, the chiral PS-BPLCs may induce and stabilize the blue phase with less proportion of chiral dopant resulting in a higher Kerr constant. The hysteresis and residual birefringence may be improved by introducing a chiral monomer with more rigid structure. And the response time is little effected by the chiral polymer network.