Fig. 4From: Broadband continuous supersymmetric transformation: a new paradigm for transformation opticsExperimental characterization of transverse spatial characteristics of light achieved by broadband SUSY transformation. a Schematic of the imaging system to characterize the transverse field intensity at the midpoint along z in the GRIN metamaterial (i.e., \(z=0.5L\)). A 4f imaging is performed for appropriate magnification. b, c, d Measured intensity profiles in the \(xy\) plane when the light was launched at different inputs from top to bottom: I1, I2, and I3, in a broad wavelength range from 1460 nm (left column), 1515 nm (middle column), to 1570 nm (right column). The results experimentally confirm that fundamental mode excitations from different input ports (I1, I2, and I3) transform to the fundamental, first-order, and second-order modes as they propagate from \(z=0\) to \(z=0.5L\), respectively, consistent with the theoretical design in Fig. 2Back to article page