Abstract
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.
Highlights
Metamaterial absorber is consisted of two layers of periodic metal structures, termed as front and back metal structures hereafter, which are separated by a dielectric substrate
The designed metamaterial absorber based subwavelength camera with energy conversion sensor is made of four layers of copper structures, the top two layers forms the metamaterial absorber and the bottom two is for DC scanning purpose
The interaction transmission between the nearby unit cell could not be measured in experimental conditions because (1) it is very hard to replace the diode with an port directly connector to the microwave network analyzer or microwave signal generator and (2) the diode cannot be replaced by a microwave excitation with the same complex impedance
Summary
The transmission measurement was carried out by feeding the excitation horn antenna with a continuous microwave with power of 0 dBm, the total microwave power shined on each imaging pixel was measured to be −43 dBm. The metamaterial absorber based camera was modeled as a dielectric plate on the X-Z plane with 120 mm × 120 mm in lateral size, 20 mm thick in vacuum (i.e. completely transparent to microwave) to mimic the experimental setup Compared to the simulated results, the experimental result (Fig. 3(c)) shows similar voltage distribution at estimated the same Cartesian coordinate positions Such result provides the first indication that the metamaterial absorber based camera is able to map out the interference pattern of sinle plate. The largest uncertainty at both axes is 0.4 mm, which is smaller
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