Jingwen Zhang

Publications (2)6.99 Total impact

• Article: Fast response beam coupling in liquid crystal cells sandwiched between ZnSe substrates.

  Chao Lian, Hua Zhao, Yanbo Pei, Xiudong Sun, Jingwen Zhang
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  ABSTRACT: Fast responses (20 ms rising time) both in symmetrical two-wave and degenerate-four-wave mixing experiments were observed and investigated in C(60) doped 4,4'-n-pentylcyanobiphenyl liquid crystal cells sandwiched between bare ZnSe substrates with an electric field applied parallel to the cell surfaces. The ZnSe material seems responsible for the fast response due to its excellent charge carrier transportation capability. Strong fanning effect and transient features were seen and studied, hinting super strong photorefractive effect in the material system. This low voltage operated liquid crystal based photorefractive approach is promising in real time applications over visible to terahertz regime.
  Optics Express 07/2012; 20(14):15843-52. · 3.59 Impact Factor
• Article: Study of effective optical thickness in photopolymer for application.

  Heng Wang, Jian Wang, Hongpeng Liu, Dan Yu, Xiudong Sun, Jingwen Zhang
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  ABSTRACT: The impact of the effective optical thickness of a photopolymer on its holographic performance was studied. To overcome the attenuation of gratings for a better uniformity, a multilayer approach was introduced, by adjusting concentrations of dye along the depth of photopolymer to compensate the attenuation of recording light due to absorption. Multilayer photopolymers with thicknesses over 500 μm were designed, fabricated, and characterized experimentally, exhibiting better Bragg selectivity. More holograms were stored in multilayer material by angular multiplexing, and the cumulative grating strength was enhanced, leading towards larger holographic storage capacity.
  Optics Letters 06/2012; 37(12):2241-3. · 3.40 Impact Factor