Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.099
Publication date: 16th December 2024
At the center of quantum technology lies the light-matter interactions. Chiral quantum optics is a rising field of research in which the momentum- and spin-dependent asymmetric light-matter interaction offers novel utilization of photonic and electronic degrees of freedom. However, it remained challenging to generate and understand the chiral photon emission in a controlled manner since the physical or structural chirality does not always translate into optical chirality or spin angular momentum (SAM). Here, we report an efficient generation of chiral quantum light in single perovskite quantum dots (PQDs), which are one of the brightest quantum emitters known so far but at the same time are intrinsically achiral.[1] By coupling the PQD with chiral plasmonic particles (Au helicoid),[2] we prompted the emission of single photons with more than an order of magnitude increased degree of circular polarization (DOCP) and Purcell factor of 2-3. Optical helicity of localized plasmon was responsible for the chirality transfer, which was largely dictated by the 3-dimensional structure-defined surface current flow of Au particle. Critical prerequisites for chiral light generation were to finely tune the PQD emitting energy to resonate with optical helicity and at the same time detune from the localized surface plasmon resonance (LSPR) band of the particle. Further, the emission handedness was retained constant under varying excitation conditions, while the photon flux of chiral emission was controlled by the excitation energy near and far above the band edge, which flipped the sign of excitation dissymmetry factor. These results shed light on the largely unexplored mechanism of chiral light-matter interaction and promises the deterministic utilization of chiral quantum light source.
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