Affiliation:
1. Harbin Engineering University
Abstract
Bound states in a continuum in periodic photonic structures can be
described as topological defects in the k-space. These vortices can migrate
within the Brillouin zone when the geometrical parameters of the
system vary. In this study, we focus on the migration of the
polarization vortex across the light line, from the radiation
continuum to the waveguide mode domain. We found that during this
transition, the far-field polarization vortex transforms into a
near-field vortex. This near-field vortex is characterized by an
enhanced localization of the evanescent field due to the vanishing
fundamental Fourier harmonic of the Bloch amplitude. This mechanism
can be used to improve polaritonic devices and optical sensors based
on all-dielectric metasurfaces by increasing the overlap between
optical modes and 2D excitons or thin layers of bio-analytes.
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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