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Pair of canonical spirals with different handedness. Insertion of a nonlinear or tunable element into one of the spirals allows inducing and controlling the chiral response of such a pair of resonators.
Circular dichroism (a) and polarization rotation (b) calculated for a pair of spirals with resonant lumped element inclusions. The spirals are placed in the plane perpendicular to the axis of the waveguide, with the wave propagating in z-direction (see Fig. 1). Solid—lumped capacitances in both spirals are 2.7 pF; dashed—capacitance of the right-handed (control) spiral is 2 pF, while left-handed spiral contains 2.7 pF capacitor.
Experimentally measured (a) dichroism and (b) polarization rotation by a pair of spirals, each having a lumped element included into the loop. The spirals are placed in the plane perpendicular to the axis of the waveguide, with the wave propagating in z-direction (see Fig. 1). Solid—low power, dashed—high power.
Nonlinear gyrotropy of the pair of canonical spirals.
Same as in Fig. 3 but for a pair of unbalanced spiral resonators.
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