Journal
OPTICS EXPRESS
Volume 20, Issue 5, Pages 5384-5391Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.005384
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Funding
- 973 programs [2011CBA00200, 2012CB921803]
- HKUST [CERG 612310, CERG 612409]
- NSFJP [BK2010360]
- PAPD
- Fundamental Research Funds for the Central Universities
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A diffraction grating is proposed by periodically defining the liquid-crystal director distribution to form alternate parallel aligned and twist nematic regions in a cell placed between two crossed polarizers. Based on the combined phase and amplitude modulation, both 1D and 2D tunable gratings are demonstrated. Low voltage ON/OFF switching of 1st order diffracted light with extinction ratio over 80 is achieved within a small voltage interval of 0.15 V-rms. Unique four-state feature of the cell is obtained and their applications in optical logic devices are discussed. (C) 2012 Optical Society of America
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