Tunable Hybrid Fano Resonances in Halide Perovskite Nanoparticles



Halide perovskites are known to support excitons at room temperatures with high quantum yield of luminescence that make them attractive for all-dielectric resonant nanophotonics and meta-optics. Here we report the observation of broadly tunable Fano resonances in halide perovskite nanoparticles originating from the coupling of excitons to the Mie resonances excited in the nanoparticles. Signatures of the photon-exciton ("hybrid") Fano resonances are observed in dark-field spectra of isolated nanoparticles, and also in the extinction spectra of aperiodic lattices of such nanoparticles. In the latter case, chemical tunability of the exciton resonance allows reversible tuning of the Fano resonance across the 100 nm bandwidth in the visible frequency range, providing a novel approach to control optical properties of perovskite nanostructures. The proposed method of chemical tuning paves the way to an efficient control of emission properties of on-chip-integrated light-emitting nanoantennas. © 2018 American Chemical Society.


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Exciton theory, Scattering, Fano resonance, Perovskite, Scattering--Mie resonance, Nanophotonics, Nanoparticles, Resonance, Halides


This work was supported by the Ministry of Education and Science of the Russian Federation (Project 16.8939.2017/8.9) and the Russian Science Foundation (Project 17-73-20336); Welch Foundation (Grant AT 16-17)


©2018 American Chemical Society