Journal
APPLIED SCIENCES-BASEL
Volume 8, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/app8101799
Keywords
electromagnetically induced transparency; all-dielectric metamaterial; near-field coupling; destructive interference; slow-light
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Funding
- National Nature Science Foundation of China [11674099, 61378033, 11621404]
- Natural Science Foundation of Shanghai [16ZR1409400]
- Shuguang Program [15SG22]
- Shanghai International Cooperation Project [16520710600]
- 111 Project [B12024]
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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.
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