Abstract
Due to several excellent properties, electromagnetic terahertz waves may be very useful for imaging applications, provided sufficiently high-resolution can be achieved. A tightly focused beam can be produced using a two-dimensional metasurface and catenary structure that enables phase-tuning of electromagnetic waves. We modified the catenary structure to produce a metasurface and a non-diffracting 0th-order Bessel beam. According to our calculation, the formed wideband focal spots can be smaller than Abbe’s diffraction limit, between 350 GHz and 450 GHz, with a maximum gain of 15.1 dB. Such a metasurface could open new doors for future high-resolution medical imaging research and technology.
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