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Basic device behavior under field application (observed by a photodetector). Initially the device is in the ground splay state. When the field is applied (at around ), a rapid transition into the state takes place. Later this state breaks down into the state(s).
Burst driving wave form for the device and illuminating LED. Period A represents the operating time (during which the device is switched into the state), period B is the delay time between bursts (allowing relaxation back to the ground splay state), and period C is the illumination time, during which conoscopic images are obtained.
Director configurations of (a) splay, (b) , and (c) states determined by using a simple finite-difference relaxation routine to minimize the bulk energy.
Measured conoscopic images of the device: (a) and (b) in splay state, (c) and (d) in state, and (e) and (f) in state. Simulated results: (g) and (h) in splay state, (i) and (j) in state, and (k) and (l) in state. The cases of (a), (c), (e), (g), (i), and (k) are illuminated/modeled with a blue LED, while the cases of (b), (d), (f), (h), (j), and (l) are illuminated/modeled with a red LED. (Each set of data has been normalized to optimize the image and exploit the image’s full dynamic range.)
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