Excitonic bound states in the continuum in van der Waals heterostructure metasurfaces
arXiv:2503.09037 · doi:10.1103/n2wb-qdhr
Abstract
We investigate the formation of excitonic bound states in the continuum in van der Waals (vdW) heterostructures composed of two-dimensional excitonic vdW layers and an optically resonant patterned vdW thin film. We show that the radiative losses of the exciton can be completely suppressed - not through conventional methods such as total internal reflection, Bragg mirrors, or metallic layers - but instead via destructive interference of exciton emission rates to distinct optical modes of the metasurface. We formulate the general conditions of excitonic BICs as a vanishing Purcell factor with non-vanishing vacuum local density of states at the exciton frequency. We propose a mechanism to achieve excitonic quasi-BICs with almost complete suppression of radiation via exciton coupling with a guided-mode resonance and multiple Fabry-Pérot modes. We show that in unpatterned vdW slabs, the Purcell factor suppression is defined exclusively by the slab's permittivity achieved via positioning the 2D exciton layer in the minimum of the mode electric field. We confirm through numerical simulations that, in periodically patterned heterostructure metasurfaces, the Purcell factor can be suppressed by more than five orders of magnitude, and this effect is not due to vanishing local electric fields. Our results demonstrate the formation of excitonic quasi-BICs and their potential for advancing quantum optics and information processing.
References in corpus (23)
- Excitons in atomically thin transition metal dichalcogenides
- Light interaction with photonic and plasmonic resonances
- Bound states in the continuum and Fano resonances in the strong mode coupling regime
- Transition metal dichalcogenide nanodisks as high-index dielectric Mie nanoresonators
- Giant optical anisotropy in transition metal dichalcogenides for next-generation photonics
- Nonlinear polaritons in monolayer semiconductor coupled to optical bound states in the continuum
- Photonic-crystal slabs with a triangular lattice of triangular holes investigated using a guided-mode expansion method
- Strong light-matter interaction with self-hybridized bound states in the continuum in monolithic van der Waals metasurfaces
- Polariton Bose-Einstein condensate from a Bound State in the Continuum
- Control of the Exciton Radiative Lifetime in van der Waals Heterostructures
- Brillouin-Wigner perturbation theory in open electromagnetic systems
- Exact mode volume and Purcell factor of open optical systems
- Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor
- Strong coupling between excitons in transition metal dichalcogenides and optical bound states in the continuum
- Normalization, orthogonality and completeness of quasinormal modes of open systems: the case of electromagnetism
- Bound states in the continuum and high-Q resonances supported by a dielectric ridge on a slab waveguide
- Dissipationless electron transport in photon-dressed nanostructures
- Quantum theory of exciton-photon coupling in photonic crystal slabs with embedded quantum wells
- Fully tunable exciton-polaritons emerging from WS monolayer excitons in an optical lattice at room temperature
- Highly Confined In-plane Exciton-Polaritons in Monolayer Semiconductors
- Nonlinear chiral metasurfaces based on structured van der Waals materials
- Resonant-state expansion for planar photonic-crystal structures
- Spatiotemporal imaging of nonlinear optics in van der Waals waveguides