Science Alert February 11, 2024
The metasurface analogue of electromagnetically induced transparency (EIT) provides a chip-scale platform for achieving light delay and storage, high Q factors, and greatly enhanced optical fields. Researchers in China developed a new approach for realizing collective EIT-like bands with a measured Q factor reaching 2750 in silicon metasurfaces in the near-infrared regime. It employed the coupling between two collective resonances, the Mie electric dipole surface lattice resonance (SLR) and the out-of-plane/in-plane electric quadrupole SLR (EQ-SLR). The collective EIT-like resonance could have diverging Q factor and group delay due to the bound state in the continuum characteristics of the in-plane EQ-SLR. According to the researchers their study opens a new route for tailoring light flow in metasurfaces… read more. TECHNICAL ARTICLE
Graphical abstract. Credit: Nano Lett. 2024, 24, 4, 1238–1245, January 5, 2024