关键词: 超表面, 单光子源, 阿基米德线, 光学手性, 钙钛矿

Abstract: Single photon sources are one of the key cornerstone technologies in quantum computing, quantum communication, and quantum-information science. Typically, circularly polarized single photon plays a crucial role in chiral quantum optics, since it carries spin angular momentum (SAM), providing a promising platform in nonreciprocal single-photon configurations and deterministic spin-photon interfaces. In this work, we demonstrate a circularly polarized single photon sources composed of double Archimedes lines perovskite metasurface, of which the efficiency of outcoupled circularly polarized single photons could reach 66% at room temperature; corresponding peak wavelength is 543 nm in the visible light band. By further tuning the relative rotation angle of the double layers Archimedes line perovskite metasurface, the output efficiency of circularly polarized single photon can be effectively modulated. In addition, our line perovskite metasurface exhibits strong circular dichroism, which realize controllable selective transmission of light wave with different spin polarization. The study improves the efficiency of circularly polarized single photon sources at room temperature, and provides a new way to develop efficient, light weight and low-cost tunable circularly polarized single photon sources and spin photon devices.

Key words: metasurface, single photon sources, Archimedes line, optical chirality, perovskite