Realization of room temperature polaritonic vortex in momentum space with hybrid Perovskite metasurface

Abstract

Exciton-polaritons are mixed light-matter excitations that result from the strong coupling regime between an active excitonic material and photonic resonances. Harnessing these hybrid excitations provides a rich playground to explore fascinating fundamental features, such as out-of-equilibrium Bose-Einstein condensation and quantum fluids of light, as well as novel mechanisms to be exploited in optoelectronic devices. Here, we investigate experimentally the formation of exciton-polaritons arising from the mixing between hybrid inorganic-organic perovskite excitons and an optical Bound state In a Continuum (BIC) of a subwavelength-scale metasurface, at room temperature. These polaritonic eigenmodes, hereby called polariton BICs (pol-BICs) are revealed in both reflectivity, resonant scattering, and photoluminescence measurements. Although pol-BICs only exhibit a finite quality factor that is bounded by the non-radiative losses of the excitonic component, they fully inherit BIC peculiar features: a full uncoupling from the radiative continuum in the vertical direction, which is associated to a locally vanishing farfield radiation in momentum space. Most importantly, our experimental results confirm that the topological nature of the photonic BIC is perfectly transferred to the pol-BIC. This is evidenced with the observation of a polarization vortex in the farfield of polaritonic emission. Our results pave the way to engineer BIC physics of interacting bosons, as well as novel room temperature polaritonic devices.

References in corpus (8)

• Quantum fluids of light
• Topological nature of bound states in the radiation continuum
• Strong light-matter coupling in two-dimensional atomic crystals
• Generation and Annihilation of Topologically-Protected Bound States in the Continuum and Circularly-Polarized States by Symmetry Breaking
• Photonic-crystal slabs with a triangular lattice of triangular holes investigated using a guided-mode expansion method
• Singular points of polarizations in the momentum space of photonic crystal slabs
• Quantum theory of exciton-photon coupling in photonic crystal slabs with embedded quantum wells
• Quantum confinement of zero-dimensional hybrid organic-inorganic polaritons at room temperature

Cited by in corpus (12)

• Applications of Bound States in the Continuum in Photonics
• Strongly enhanced light-matter coupling of a monolayer WS2 from a bound state in the continuum
• Room Temperature Exciton-Polariton Condensation in Silicon Metasurfaces Emerging from Bound States in the Continuum
• Room-temperature exceptional-point-driven polariton lasing from perovskite metasurface
• Reconfigurable quantum fluid molecules of bound states in the continuum
• Theory of photonic crystal polaritons in periodically patterned multilayer waveguides
• Theory of exciton-polariton condensation in gap-confined eigenmodes
• Dirac exciton-polariton condensates in photonic crystal gratings
• Topological enhancement of exciton-polariton coherence with non-Hermitian morphing
• Topological photonics in nanoscaled systems with far field radiation and polarization singularities
• Reciprocal Quantum Electrodynamics with Bound States in the Continuum
• Engineering strong coupling in ultra-compact photonic crystal/2D material platforms