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.

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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