LAUSR

In this article, a multifrequency electromagnetic modulator based on the solid-state plasma (SSP) metamaterial is proposed. It can achieve two modulations of electromagnetically induced transparency (EIT) and bandpass/stop filter, to realize speed and switching modulation of electromagnetic waves with specific frequencies. By exciting different SSP resonance units, the metamaterial modulator can obtain two states (states I and II), showing two different transmission spectra. When working as a tunable EIT, the state I appears as double transmission peaks with the delay-bandwidth product (DBP) reaching 0.517 and 0.421, whereas state II has a single peak with DBP up to 0.675. Since there is a one-to-one correspondence between the frequency points of transmission peaks and valleys in the two states, when state I manifests as an EIT, state II can serve as a band stop filter for the transmission peaks of state I. Conversely, when state II acts as an EIT, the state I can serve as its band stop filter to realize the switching modulation of these frequencies. Therefore, such an SSP-based metamaterial modulator can simultaneously meet the modulations of tunable EIT and corresponding bandpass/stop filter, which has great application prospects.