In this article, we present a miniaturized electromagnetic modulator based on electrically controllable spontaneous-emission-cancellation-like (SEC-like) effect in meta-molecule. The SEC-like meta-molecule with in-unit destructive interference interaction is constructed by two detuned side-coupled resonators based on zero-index-metamaterial The subwavelength ZIM-based resonators, regarding as meta-atoms, are arranged symmetrically in a cut microstrip. A diode serving as an adjustable resistor is embedded in the gap of microstrip to inductively tune the interference of two ZIM-based meta-atoms. Numerical simulations indicate that the remarkable modulation on the SEC-like spectrum can be realized by changing the resistance from 9,000 Ω (unconnected) to 10 Ω (connected). Microwave experiments validate the electromagnetic modulation in three narrow bands on the SEC-like spectrum, and a peak modulation contrast of 52.1 dB on the transmission at 2.59 GHz is achieved through electric biasing. The results in this work may pave the way for our design to be applied in new integrated active devices and applications.
We report a side-coupled resonator-cavity configuration with a tunable Fano-type interference effect for a novel subwavelength switch. A defective microstrip photonic crystal (PC) structure is designed to provide a continuum state, while a split ring resonator (SRR) is introduced to offer a narrow discrete resonance. The SRR is conductively side-coupled with the microstrip PC cavity in a subwavelength volume. Interactions between them result in Fano-type transmitting spectra with a sharp and asymmetric spectral line profile. A varactor diode serving as the nonlinear medium inclusion is integrated into the slit of the SRR for active control of the sharp Fano resonance. The strongly localized field produced by Fano resonance plays a role in improving the nonlinear properties of the microstrip PC cavity. It is found that a significant blue shift of 94 MHz on the Fano resonance frequency can be achieved by increasing the input power levels from −25 dBm to 8 dBm. We also found that the maximum transmission contrast exceeding 15.9 dB can take place between two bistable states existing at 3.05 dBm and 4.32 dBm for a bidirectional sweep of input power under a monochromatic signal frequency of 1.27 GHz. The findings may benefit the exploitation of metamaterials-assisted active photonic nanocircuits.
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