Abstract
We experimentally and theoretically investigate the nonlinear electromagnetic properties of a microstrip photonic crystal (PC) cavity with embedded electromagnetic-induced-transparency (EIT)-like meta-atoms. A bistable response, with threshold of low to −6.1 dBm and the transmission contrast of up to 4.0 dB, is conceptually demonstrated with a varactor as the nonlinear medium inclusion. Such low-threshold and high-contrast transmission action comes from the composite PC-EIT mechanism, which possesses sharper features and stronger localization of the electromagnetic field than either PC cavity or EIT-like meta-atoms. This mechanism will be useful for all-optical signal processing with advanced materials.
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