High- Q Quasibound States in the Continuum for Nonlinear Metasurfaces

Sharp electromagnetic resonances play an essential role in physics in general and optics in particular. The last decades have witnessed the successful developments of high-quality (Q) resonances in microcavities operating below the light line, which however is fundamentally challenging to access from free space. Alternatively, metasurface-based bound states in the continuum (BICs) offer a complementary solution of creating high-Q resonances in devices operating above the light line, yet the experimentally demonstrated Q factors under normal excitations are still limited. Here, we present the realizations of quasi-BIC under normal excitation with a record Q factor up to 18 511 by engineering the symmetry…

• NS
  National Supercomputer Centre in Guangzhou
• NN
  National Natural Science Foundation of China

  Awards: 11761131001, 11874020, 2018YFA0306100, 91750110, 11874437, 1674130, 11674130, 11674110
• NS
  Natural Science Foundation of Guangdong Province

  Awards: 201806010040, 2018B030311027, 2016TQ03X981, 2016A030306016
• PR
  Pearl River S and T Nova Program of Guangzhou

  Award: 201806010040
• FR
  Fundamental Research Funds for the Central Universities