KEYWORDS: Wave propagation, Radio propagation, Wavefronts, Integrated optics, Near field optics, Microwave radiation, Control systems, Near field, Electromagnetism
Although many schemes have been proposed to manipulate propagating waves (PWs) and surface waves (SWs), usually each operation needs a different meta-device, being highly unfavorable for optics integrations. Here, we propose a scheme to design a single meta-device that can efficiently generate SWs and/or PWs with pre-designed wavefronts, illuminated by circularly polarized wave with different chirality. As a proof of concept, we design and fabricate a microwave meta-device and experimentally demonstrate that it can efficiently convert a CP wave with left or right handedness into a SW beam focused to a point or a SW beam travelling to a pre-designed direction. We further develop our scheme to design a meta-device and numerically demonstrate that it can either excite a SW beam or generate a far-field PW with pre-designed wavefront. Our work may stimulate simultaneous controls on far- and near-field EM environments based on a single ultra-compact platform.
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