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(a) Schematic of the light-tunable SRR and attached electronic components. (b) Photograph of a SRR sample (bottom dielectric board) excited by a loop antenna (top dielectric board) and illuminated by a light source.
Measured reflection coefficient for two different values of the input microwave signal power and for two different intensities of the external light source.
(a) Nonlinear equivalent circuit of SRR excited by a loop antenna. (b) Voltage across the varactor vs. frequency simulated numerically for input powers from 5 dBm to 20 dBm with a step of 2.5 dBm and light intensity 0 lx. (c) Simulated shift of the resonant frequency of the nonlinear SRR vs. the input power, with and without external illumination.
Experimentally measured current vs. voltage (I–U) characteristics of a BPW-34-S photodiode for two values of light intensity.
Experimentally measured shift of the SRR resonant frequency as a function of input power, for two values of light source intensity. Measured data are shown by markers, whereas the lines are guide for eye.
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