Abstract
Homogeneously aligned nematic liquid-crystal (LC) cells and twisted nematic LC cells are fabricated using a Si wafer as a substrate and electrode. Their optical properties are investigated in an infrared (IR) wavelength range of 10 μm band. Transmittance of LC materials is high, and the effective birefringence value is enough to apply the LC to the IR optical devices although it is smaller than that in the visible region. The LC lens cell is fabricated using the Si wafer as a lower electrode-substrate. A flat plate of 1.0 mm thick polyolefin resin on which a hole-patterned aluminum film is deposited is used as an upper substrate and electrode, in order to reduce an absorption loss by the electrode. An IR imaging system composed of the LC lens and a thermography camera is implemented, and a focused thermal image is obtained using a wire-grid IR polarizer. A polarizer-free IR imaging system is also reported.
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