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Rapid fabrication of an electrically switchable liquid crystal Fresnel zone lens
Yimin Lou1, Qingkun Liu, Hui Wang
1Institute of Information Optical Engineering, Soochow University, Suzhou 215006, China.
Abstract:
Based on a nanoimprint technique, a new method is proposed for the rapid fabrication of an electrically switchable liquid crystal Fresnel zone lens (SLCFZL). The flow chart of the proposed fabrication method for a SLCFZL is given and a binary SLCFZL is experimentally demonstrated using the proposed method. The diffraction efficiency of the SLCFZL is continuously tunable through an external electric field, and the driving voltage is relatively low (<15V(rms)). The measured maximal diffraction efficiency reaches ∼35% for a linearly polarized light, which is close to the theoretical value of 40.5%. The focusing and imaging properties of the SLCFZL are also experimentally tested.
