Extended bound states in the continuum in a one-dimensional grating implemented on a distributed Bragg reflector.

ABSTRACT: Bound states in the continuum (BICs) are observed in optical cavities composed of a high refractive index periodic structure embedded in significantly lower refractive index surroundings, enabling vertical confinement of the grating modes. Here, we propose a vertically nonsymmetric configuration, implemented on a high refractive index bulk substrate with a one-dimensional grating positioned on a distributed Bragg reflector (DBR). In this configuration, the grating modes are leaky, which could prohibit the creation of a BIC if the grating was implemented on uniform substrate. However, the judiciously designed DBR on which the grating is implemented reflects nonzero diffraction orders induced by the grating. We found that the laterally antisymmetric optical modes located at the center of the

SUBMITTER: Pruszynska-Karbownik E 

PROVIDER: S-EPMC11501903 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature