Fig. 1: The experimental setup.
From: Non-linear coherent perfect absorption in the proximity of exceptional points
a Photograph of the experimental system including the connections. The scale is given on the lower left. b Zoom showing the experimental non-linear system consisting of a cylindrical dielectric resonator (permittivity ϵr ≈ 36, radius = 4 mm, height = 5 mm) where a short-circuited diode is situated above separated by a 1 mm high Teflon spacer (permittivity ϵr = 2.1 with the two transmitting/receiving antennas, where the distance between the central parts of the antennas is 15 mm. The resonator is sandwiched between two aluminum plates with a distance 16 mm. The scale given corresponds to the diameter of 8 mm of the resonator. c Sketch detailing the setup. IQ-modulator stands for In-phase and Quadrature vector modulators, VNA for Vector Network Analyzer, PC for Personal Computer, and κ1 and κ2 for the coupling strengths of the antennas. The coaxial cables have a length of 50 cm.
