Tunable diffraction grating using ultraviolet-light-induced spatial phase modulation in dual-frequency liquid crystal
Abbreviated Journal Title
Appl. Phys. Lett.
An electrically tunable diffraction phase grating using ultraviolet (UV)-light-induced spatial dielectric modulation of a dual-frequency liquid crystal (DFLC) cell is demonstrated. A photomask with transparent and opaque stripes was used for fabricating the grating. In the UV-exposed stripes, the negative dielectric anisotropy (Deltaepsilon) tolane compound of the DFLC mixture is partially polymerized resulting in a decreased threshold voltage as compared to that of the unexposed region. Upon applying a constant voltage, the phase difference between the adjacent pixels is produced. The first-order diffraction efficiency reaches similar to60% which agrees well with the simulation results. Due to the dual-frequency addressing at 30 V-rms, the response time of the DFLC phase grating was measured to be similar to1 ms at room temperature. (C) 2004 American Institute of Physics.
Applied Physics Letters
"Tunable diffraction grating using ultraviolet-light-induced spatial phase modulation in dual-frequency liquid crystal" (2004). Faculty Bibliography 2000s. 4544.