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A new 2-D ultra-thin transmissive phase gradient metasurface (TPGM) with polarization-independent property is proposed based on the generalized Snell’s law of refraction. The super unit cell of the tri-layer TPGM consists of $6 \times 6$ suitably selected elements with $- {60}^\circ $ phase gradient at $x $-direction and 60° phase gradient at $y $-direction, respectively. The characterizations and...
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