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In this paper, a tunable THz lens array based on reconfigurable metamaterials is reported. The metamaterial consists with 40 × 40 liquid metal microdroplets, in which the shape is tuned under different air pressures. The droplets are formed by injecting the liquid mercury into a pre-designed microchannel network and arranged to focus incident THz wave. The focus spot size can be tuned with different...
Millimeter-Wave-based radar has gained attention in recent years for automotive and object detection applications [1]. Several new applications are also emerging which employ mm-Wave radar techniques to construct short range mm-Wave 3D imaging systems for security screening and biomedical applications [2]. At present, these types of 3D mm-Wave imagers have only been demonstrated in III-V technology,...
This paper reports a 3-dimensional (3D) micro-optical coupling system for improving coupling efficiency in the Littrow configured micro-electro-mechanical system (MEMS) tunable lasers. In the coupling system, an optical fiber acts as a rod lens for light convergence in the vertical plane, while a deep-etched silicon parabolic mirror confines the light in the horizontal plane. Compared with previous...
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