Numerical simulation study demonstrates that grooved-dielectric Fresnel zone plates achieve ordinary lens-level focusing at 1.5 THz, indicating their viability as lightweight terahertz antennas.
A number of microwave and terahertz grooved‐dielectric Fresnel zone plate (FZP) and ordinary lenses and antennas are studed and compared numerically. Although the microwave (38 GHz) eight‐step FZP lens is certainly inferior, the corresponding terahertz (1.5 THz) FZP lens is comparable in focusing action to the ordinary one. By use of a new design approach to the terahertz FZP lens/antenna the typical unwanted focusing shift from the design frequency is removed and even better focusing performance is obtained within a limited frequency band. Thus, at terahertz frequencies the dielectric FZP lens or antenna is a lightweight and an effective option to the ordinary lens or antenna.
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Hristov et al. (2012) studied this question.
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