[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Terahertz Near-field Metasurfaces and Superfocusing

摘要： In this work, a near-field metasurface is designed to overcome diffraction limit and superfocus terahertz waves by elaborately arranging the proposed unit cells with super small electric sizes. The full width at half-maximum beam width reaches up to 0.067λ0 (free-space wavelength) at a distance of 0.073λ0 at 0.437 THz. The near-field metasurface is beneficial for subwavelength resolution imaging, photolithography, non-contact sensing, and other applications in the near field.