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In this paper, we present an array of cat's eye retro-reflectors with modulability for an optical identification (ID) system. The modulability is obtained through the use of a smart film, a polymer dispersed liquid crystal device (PDLC). Switching of the image pattern of retro-reflected light is demonstrated. Such a dynamic image can function as the "key" so that a high-security, high-privacy...
We report a two-axis MEMS scanner driven by radial vertical combdrive actuators. The device is fabricated by a five-layer polysilicon surface micromachining process. A cross-bar spring structure consisting of lower and upper torsion springs is designed to achieve two rotational degrees of freedom, enabling the dual-axis rotation. Both the vertical comdrive actuators and the torsion springs are hidden...
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