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116 1 0.3 THz 1 2 X 2020 Si MgO 3.4 3.1 H 3 4,5 4 5 0.31 THz n eff = 6.7 + j0.12 92% 1.2% 6-9 10 V 11,12 13 14 15 16 The growth of terahertz technology has opened up the strong potential of various attractive applications in the terahertz waveband. However, conventional optical elements such as collimated lenses are too large for the wavelength, and terahertz devices demand compact and thin optical elements for industrial applications. We propose and design an ultrathin gradient lens withdoi:10.2184/lsj.44.2_116 fatcat:l667b4y7lrhefirhl6h53vckxu