22 May 2015 Optimizing the diffraction efficiency of LCOS-based holography with anomalous reflection by gradient meta-surface
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Meta-surface offers an innovative approach to manipulate light with anomalous capabilities. We discuss the possibility of inserting a specially designed gradient meta-surface into the pixel architecture of the liquid crystal on silicon (LCOS) for the purpose of optimizing the diffraction efficiency of LCOS-based holography. The pixels in LCOS with feature size approaching the order of visible light wavelength could provide large diffraction angle, unfortunately, scaling down the pixel size would reduce the efficiency of the first diffraction we desired. The metal-insulator-metal (MIM) structure served as the unit cell of meta-surface consists of three layer, i.e., the subwavelength metal nanobrick with varying geometrical parameter and the continuous metal film separated by the insulator layer. A linear phase gradient is exhibited by the unit cells in each pixel period. When illuminated by a polarized incident light, the MIM structure, where a magnetic resonance is created at a particular frequency, can offer an anomalous reflection with high-efficiency and acts as a flat blazed grating. Finally, the light are supposed be diverted to the desired first diffraction. The properties of potential metal, such as Au, Ag, and Al, served as the plasmonic material and suitable insulator have been studied to configure the MIM structure accurately. Investigations are numerically carried out to observe the effects on the distribution of liquid crystal director with TechWiz Software and to obtain the relative diffraction efficiency by using FDTD software. Compared with the conventional LCOS device, the optimization of the diffraction efficiency has been achieved by our proposed structure.
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Chuan Shen, Chuan Shen, Kaifeng Liu, Kaifeng Liu, Sui Wei, Sui Wei, Lei Ni, Lei Ni, Hao Wang, Hao Wang, "Optimizing the diffraction efficiency of LCOS-based holography with anomalous reflection by gradient meta-surface", Proc. SPIE 9495, Three-Dimensional Imaging, Visualization, and Display 2015, 94950Z (22 May 2015); doi: 10.1117/12.2176804; https://doi.org/10.1117/12.2176804


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