Fig. 3
From: Broadband continuous supersymmetric transformation: a new paradigm for transformation optics
Experimental characterization of broadband on-chip continuous SUSY transformation. a, c Normalized transmittance spectra of the asymmetric a and symmetric c Si GRIN metamaterials. Top, middle, and bottom panels denote three single-mode inputs from top to bottom: I1, I2, and I3, respectively. The transmission spectra are measured at three outputs: O1, O2, and O3. Note that in both asymmetric a and symmetric c cases, three output intensities are normalized to their sum. The colors of the line plots and the arrows of the insets (blue, red, green) coincide with the colors of the eigenstates in Fig. 2, according to their corresponding optical modes. b, d Measured transmission (M) matrices where Mji stands for power transmission from input i to output j at the wavelength of 1550 nm, retrieved from a and c, respectively