Tunable Composite Metamaterials with Imbedded Coherently Controllable Atomic or Molecular Materials

Sangeeta Chakrabarti, S. Anantha Ramakrishna, Harshawardhan Wanare

Two independent significant developments have challenged our understanding of light-matter interaction, one, involves the artificially structured materials known as metamaterials, and the other, relates to the coherent control of quantum systems via the quantum interference route. We theoretically demonstrate that one can engineer the electromagnetic response of composite metamaterials using coherent quantum interference effects. In particular, we predict that these composite materials can show a variety of effects ranging from dramatic reduction of losses to switchable ultraslow-to-superluminal pulse propagation. We propose parametric control of the metamaterials by active tuning of the capacitance of the structures, which is most efficiently engineered by embedding the metamaterial structures within a coherent atomic/molecular medium. This leads to dramatic frequency dependent features, such as significantly reduced dissipation accompanied by enhanced filling fraction. For a Split-ring resonator medium with magnetic properties, the associated splitting of the negative permeability band can be exploited for narrow band switching applications at near infrared frequencies involving just a single layer of such composite metamaterials.

Mingming Chen, Xue‐Xia Yang

Cheng‐Kuang Chen, Ta‐Jen Yen

New designs "meta-atom" and "meta-material" composed from all-dielectric resonators with high Q and low loss, this kind metamaterial is coupled from propagating plane wave and generates electromagnetic response like electromagnetically induced transparency in atomic vapor. The "meta-atom" or "meta-molecular" are not only workable in room temperature but also enable three dimensional ommidirectionally incident with superposition stacking. Meanwhile, the EIT-like via dielectric metamaterial with high transmittance, dramatic index change and tunable operating frequency. The simulation result agrees the possibility electromagnetically induced transparency -like bulk exists from microwave to THz region.

Nikolay I. Zheludev

Sangeeta Chakrabarti, S. Anantha Ramakrishna, Harshawardhan Wanare

We theoretically demonstrate the possibility of dynamically controlling the response of metamaterials at optical frequencies using the well known phenomenon of coherent control. Our results predict a variety of effects ranging from dramatic reduction of losses associated with the resonant response of metamaterials to switchable ultraslow to superluminal propagation of pulses governed by the magnetic field of the incident wave. These effects, generic to all metamaterials having a resonant response, involve embedding the metamaterial in resonant dispersive coherent atomic/molecular media. These effects may be utilized for narrow band switching applications and detectors for radiation below predetermined cut-off frequencies.

Lei Yang, Lei Gao, Rui Jiang +6 more