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- W2803400902 abstract "Polarization conversion of terahertz waves is important for applications in imaging and communications. Conventional wave plates used for polarization conversion are inherently bulky and operate at discrete wavelengths. As a substitute, we employ reflective metasurfaces composed of subwavelength resonators to obtain similar functionality but with enhanced performance. More specifically, we demonstrate low-order dielectric resonators in place of commonly used planar metallic resonators to achieve high radiation efficiencies. As a demonstration of the concept, we present firstly, a quarter-wave mirror that converts 45° incident linearly polarized waves into circularly polarized waves. Next, we present a half-wave mirror that preserves the handedness of circularly polarized waves upon reflection, and in addition, rotates linearly polarized waves by 90° upon reflection. Both metasurfaces operate with high efficiency over a measurable relative bandwidth of 49% for the quarter-wave mirror and 53% for the half-wave mirror. This broadband and high efficiency capabilities of our metasurfaces will allow to leverage maximum benefits from a vast terahertz bandwidth." @default.
- W2803400902 created "2018-06-01" @default.
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- W2803400902 date "2018-05-22" @default.
- W2803400902 modified "2023-10-07" @default.
- W2803400902 title "Dielectric-resonator metasurfaces for broadband terahertz quarter- and half-wave mirrors" @default.
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- W2803400902 doi "https://doi.org/10.1364/oe.26.014392" @default.
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