High Quality Factor Fano-Resonant All-Dielectric Metamaterials
arXiv:1405.3901
Abstract
Metasurface analogues of electromagnetically induced transparency (EIT) have been a major focus of the nanophotonics field over the past several years due their ability to produce high quality factor (Q-factor) resonances for applications such as low-loss slow light devices and highly sensitive optical sensors. However, Ohmic loss limits the achievable Q-factors in conventional plasmonic EIT metasurfaces to values less than 10, significantly hampering device performance. Here, we report experimental demonstration of a classical analogue of EIT using all-dielectric silicon-based metasurfaces. Due to extremely low absorption loss and coherent interaction of neighboring meta-atoms, a record-high Q-factor of 483 is experimentally observed, leading to a refractive index sensor with a figure-of-merit (FOM) of 103. Furthermore, we show that the dielectric metasurfaces can be engineered to confine the optical field in either the silicon resonator or the environment, allowing one to tailor light-matter interaction at the nanoscale.
arXiv commentTwo errors have been corrected: 1. In the simulations, cross-polarized fields were mistakenly not included leading to artificially inflated Q-factors. 2. The measured arrays were later found to have a partially connected gap, preventing cross-polarized light scattering and preserving a high Q-factor. The new manuscript corrects these errors and examines fully connected ring-based resonators
References in corpus (8)
- Fano resonances in nanoscale structures
- Realization of an all-dielectric zero-index optical metamaterial
- Coupling between a dark and a bright eigenmode in a terahertz metamaterial
- Spectral collapse in ensembles of meta-molecules
- Metamaterial transparency induced by cooperative electromagnetic interactions
- Coherent control of nanoscale light localization in metamaterial: creating and positioning a sub-wavelength energy hot-spot
- Theoretical formalism for collective electromagnetic response of discrete metamaterial systems
- Silicon-based Infrared Metamaterials with Ultra-Sharp Fano Resonances