Journal
OPTICS EXPRESS
Volume 20, Issue 24, Pages 26464-26472Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.026464
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Funding
- National Research Foundation (NRF) of Korea, the Korea-China Joint Research Program [2012-0004814]
- U.S. Air Force Office of Scientific Research (AFOSR) [FA95550-09-1-0170]
- National Research Foundation of Korea [2012-0004814] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A simple approach for preparing gradient polymer network liquid crystal (PNLC) with a large refractive index change is demonstrated. To control the effective refractive index at a given cell position, we applied a voltage to a homogeneous cell containing LC/diacrylate monomer mixture to generate the desired tilt angle and then stabilize the LC orientation with UV-induced polymer network. By varying the applied voltage along with the cells' movement, a PNLC with a gradient refractive index distribution is obtained. In comparison with conventional approaches using patterned photomask or electrode, our method offers following advantages: large refractive index change, freedom to design specific index profile, and large panel capability. Potential applications include tunable-focus lenses, prism gratings, phase modulators, and other adaptive photonic devices. (C) 2012 Optical Society of America
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