DOI: https://doi.org/10.29363/nanoge.emlem.2024.005
Publication date: 13th July 2024
The ultimate goal of quantum optics is to achieve complete control of light-matter interaction at the single-quanta level. Photons carry information encoded in properties such as frequency, amplitude, and phase. Another encoding capacity that can enhance robustness of this qubit is optical chirality. Chiral photons are particularly advantageous because they carry background-free binary data, and the spin-controlled light propagation direction promises powerful nonreciprocal quantum devices. Here, we report the generation of strong chiral emission in single perovskite nanocrystals (NCs), which are bright and efficient quantum emitters but are intrinsically achiral. By placing the quantum emitter in proximity to chiral plasmonic particles, we boosted the degree of circular polarization (DOCP) of single-photon emission by an order of magnitude. Polarization-resolved single-dot spectroscopy at cryogenic temperature revealed that the chirality transfer occurs through the interaction of the local chiral plasmonic field with the photonic states of the perovskite NCs. The handedness anisotropy of both excitation and emission showed an order of magnitude increase at the presence of chiral field, which was accompanied by a 3-4-fold acceleration of the radiative decay rate. This induced chirality was precisely controlled by nanometer-scale engineering of the NC-plasmon spacing. These results provide a significant advance in understanding the largely unexplored mechanism of chiral light-matter interaction, presenting an exciting challenge for future theoretical work and applications.
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