Fig. 4: Electrically driven tunability of the terahertz isolator.
From: On-chip terahertz isolator with ultrahigh isolation ratios
a Resonant frequencies of two adjacent modes with the change of the applied current when B = 0.76 T. The error bars represent the standard deviations of three measurements of central frequencies. In a, blue dots refer to the CW direction and red dots refer to the CCW direction. In a and b, the square points are marked as mode 1, and the circle points refer to mode 2. b Frequency detuning between CW and CCW directions (FCCW–FCW: F refers to the resonant frequencies) with the variety of the applied current when B = 0.76 T. The error bars represent the standard deviations of three measurements of frequency detunings. c Isolation ratios of the chip in the change of the applied current (0, 211, 356 mA). d Isolation ratios in the change of the applied current (0, 211, 356 mA) at different operation frequencies, frequency windows are 0.405–0.415, 0.445–0.455, and 0.485–0.495 THz.
