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论文作者:英语论文网论文属性:本科毕业论文 Thesis登出时间:2011-08-02编辑:zn1987点击率:6877
论文字数:2427论文编号:org201108021343173298语种:英语 English地区:加拿大价格:$ 55
关键词:加拿大光学研究论文Liquid crystal polarization gratingLiquid crystalOptics
摘要:英语论文网专业提供加拿大光学研究论文定制,加拿大工程管理论文定制等论文服务。我们报告一个液晶偏振光栅(LCPG)首次高对比度的调节非偏振光的实验结果,我们的目标是发展一个液晶(LC)能够与高对比度的调节非偏振光的显示元素。
Polarization-Independent Switching With High Contrast From A Liquid Crystal Polarization Grating
Abstract
We report experimental results of a liquid crystal polarization grating (LCPG) modulating unpolarized light with high contrast for the first time. Striking results are observed: nearly ideal diffraction into the first orders at > 99%, contrast ratios of up to600:1 for monochromatic light, switching times of ~ 2 ms fornematic LCs, and threshold voltage of 1.65 Arms.
1. Introduction
Our objective is to develop a liquid crystal (LC) display element capable of modulating unpolarized light with high contrast, and to ultimately integrate it into a highly efficient portable projection display based on a light-emitting-diode (LED) light engine. Family of theoretically polarization-independent, binary, LCgratings was previously studied [1-3] but was plagued by the presence of domain boundary lines and random disclamations, were limited to very large grating periods, and did not achieve theoretical diffraction efficiencies (limiting contrast and brightness). Even the more recent improvements [4, 5] with polymer-wall LC gratings still manifest less than ideal efficiencies, diffract noticeably up to the 5th diffraction order, and are challenging to fabricate at periods on the order of 10s of μm.The central limitation in all of these approaches is the binary nature of the gratings.
Diffraction gratings that operate by periodically modulating the state of polarization of light passing through them are generally classed as “polarization gratings”. These are composed essentially of a periodically patterned Optical anisotropy, and offer a unique opportunity to create switchable diffractive optics, particularly since it was observed early that PGs with 100% diffraction efficiency into the first order(s) could be achieved with a thin-grating regardless of input polarization.
Several research groups recognized that a continuous LCdiffractive grating will have improved diffraction properties (over binary LC gratings), and that holography can be used to greatly simplify fabrication and achieve smaller grating periods. Further theoretical studies by Zeldovich and coworkers identified compelling characteristics, including the potential to modulate unpolarized light with high contrast. Initial experimental results by Crawford and coworkers were promising, but were plagued by pervasive defects degrading their optical properties. Consequently, the maximum diffraction efficiency and switching contrast ratio was poor, and strong incoherent scattering outside of the diffraction orders was present.
8. References
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[4] Y. Zhang et al., SID Digest, vol. 36, pp. 1178-1181 (2005).
[5] B. Wang, X. Wang, P. J. Boss, J. Opt. Soc. Amer. A, vol. 21, pp. 1066-1072 (2004).
[6] L. Nikolova, T. Tomorrow, Optical Act, vol. 31, pp. 579-588 (1984).
[7] J. Trevor, J. Turenne, Opt. Let., vol. 25, pp. 785-786 (2000).
[8] H. Sarkissian et al., SPIE Optics in the Southeast Conference Orlando FL, PSE-02, 2003.
[9] J. Trevor et al., J. Opt. Soc. Amer. A, vol. 20, pp. 282-289 (2003).
[10] J. Eakins et al., Appl. Phys. Let., vol. 85, pp. 1671-1673 (2004).
[11] H. Sarkissian et al., Storming Media Repo本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。