科研之友
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摘要
We experimentally and theoretically investigate the nonlinear electromagnetic properties of light-tunneling heterostructures embedded with a varactor-loaded electromagnetically-induced-transparency (EIT)-like highly dispersive meta-molecule. We illustrate that when an EIT-like meta-molecule is hired at the interface of epsilon-negative medium and mu-negative medium, the Q-factor and corresponding local fields of tunneling modes can be greatly boosted. Further study reveals that the electromagnetic (EM) field confinement along the propagating direction provided by the heterostructures, and the in-plane localization originated from the EIT-like meta-molecule, give rise to the three-dimensional enhancement of sub-wavelength EM localization corporately. Moreover, such a configuration can generate an extremely high transmission contrast up to 12 dB between two bistable states in its transmission with a bistability threshold low to -4.7 dBm. These advantages are not at the cost of extra device volume and drastic reduction of transmittance.
