期刊
ACS PHOTONICS
卷 3, 期 6, 页码 1019-1026出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00102
关键词
dielectric resonator antenna (DRA); metasurfaces; reflectarrays; terahertz technology; flat optics; focusing mirror
类别
资金
- Australian Research Council Future Fellowship [FT120100351, FT100100585]
- European Union (Marie Curie IEF) [300934]
- Swiss National Science Foundation [133583]
- Australian Research Council [FT120100351] Funding Source: Australian Research Council
Advances in terahertz technology rely on the combination of novel materials and designs. As new devices are demonstrated to address the terahertz gap, the ability to perform high-efficiency beam control will be integral to making terahertz radiation a practical technology. Here, we use a metasurface composed of nonuniform dielectric resonator antennas on a ground plane to achieve efficient beam focusing at 1 THz. The dielectric resonators are made of high resistivity silicon, which is a low-loss, nondispersive material for terahertz waves. The resonators operate around the resonance of the displacement current in the silicon, which is crucial to attaining high efficiency. The reflectarray's capacity to focus terahertz radiation is experimentally verified, and hence by the principle of antenna reciprocity, it can also be employed as a terahertz collimator. The demonstrated device can therefore be deployed for high-gain terahertz antennas. Further measurements show that the loss of the reflectarray is negligible, which confirms the high efficiency of the dielectric resonators. This finding will enable the design of efficient flat-profile terahertz reflectarrays and metasurfaces to serve arbitrary beam control requirements in the near and far fields.
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