Abstract
An analogy of electromagnetically induced transparency (EIT) based on all-dielectric metamaterial is theoretically demonstrated in this paper. The U-shaped Silicon-based metamaterial unit cell comprises a dipole antenna supported by one horizontal nanoscale bar and a quadrupolar antenna supported by two vertical nanoscale bars. The near-field coupling between the two antennas and the reduction of absorption loss lead to a narrow EIT-like transmission window with a high quality-factor of 130, which exhibits a refractive index sensitivity with a figure-of-merit of 29. The group delay of 0.75 ps and the group index of 2035 are obtained in the transmission window. Due to these unique optical properties, the proposed metamaterial structure can find many applications including slow-light devices, optical sensors, enhancement of non-linear processes, and storage of quantum information.
Highlights
Induced transparency (EIT) as a quantum interference phenomenon has been a research topic in quantum optics in recent years
It was initially demonstrated in a three-level atomic system, where the resonant coupling between the dipole-allowed transition of the ground state (|0>) to an upper energy level (|1>) and the transition of the energy level (|1>) to a metastable level (|2>) by two coherent laser pump leads to a destructive interference between two transition pathways, namely, |0> → |1> and |0> → |1> → |2> → |1> [1]. This results in a narrow transmission window (NTW)
When the plane wave is incident along the negative direction of the z axis with polarization along the x axis, the destructive interference between the bright mode and the dark mode leads to a narrow transmission window shown in Figure 1c, displaying a characteristic Electromagnetically induced transparency (EIT)-like behavior
Summary
Induced transparency (EIT) as a quantum interference phenomenon has been a research topic in quantum optics in recent years. It was initially demonstrated in a three-level atomic system, where the resonant coupling between the dipole-allowed transition of the ground state (|0>) to an upper energy level (|1>) and the transition of the energy level (|1>) to a metastable level (|2>) by two coherent laser pump leads to a destructive interference between two transition pathways, namely, |0> → |1> and |0> → |1> → |2> → |1> [1]. This results in a narrow transmission window (NTW). It has been proved that the properties of EIT, especially high transmission and strong dispersion, are crucial for a number of potential applications such as optical sensing [4,5], slow-light devices [6,7,8,9,10], and storage of quantum information [11,12]
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