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(a) The conversion efficiency from LCP to RCP versus wavelength for unit cell U1 when GST stays in amorphous state (red line) and crystalline state (greed line). (b) The phase modulation of unit cell U1 versus rotating angle θ for both states of GST at the designed wavelength of 1.31 μm. (c) The conversion efficiency of unit cell U1 from LCP to RCP versus rotating angle θ for both states at the designed wavelength of 1.31 μm.
