Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.
Department of Physics and Astronomy, University of Denver, Denver, Colorado 80208, USA.
Sci Rep. 2017 Jan 10;7:40490. doi: 10.1038/srep40490.
The design, fabrication and characterization of a novel metamaterial absorber based camera with subwavelength spatial resolution are investigated. The proposed camera is featured with simple and lightweight design, easy portability, low cost, high resolution and sensitivity, and minimal image interference or distortion to the original field distribution. The imaging capability of the proposed camera was characterized in both near field and far field ranges. The experimental and simulated near field images both reveal that the camera produces qualitatively accurate images with negligible distortion to the original field distribution. The far field demonstration was done by coupling the designed camera with a microwave convex lens. The far field results further demonstrate that the camera can capture quantitatively accurate electromagnetic wave distribution in the diffraction limit. The proposed camera can be used in application such as non-destructive image and beam direction tracer.
研究了一种具有亚波长空间分辨率的新型基于超材料吸收体的相机的设计、制作和特性。所提出的相机具有设计简单、重量轻、易于携带、成本低、分辨率和灵敏度高、对原始场分布的干扰或失真最小等特点。在近场和远场范围内对所提出的相机的成像能力进行了表征。近场实验和模拟图像均表明，该相机产生的图像具有定性准确性，对原始场分布的失真可以忽略不计。远场演示是通过将设计的相机与微波凸面镜耦合来完成的。远场结果进一步表明，该相机可以在衍射极限内捕获定量准确的电磁波分布。所提出的相机可用于无损成像和光束方向跟踪等应用。
