Overcoming the challenges of patterning luminescent materials will unlock additive and more sustainable paths for the manufacturing of next-generation on-chip photonic devices. Electrohydrodynamic (EHD) inkjet printing is a promising method for deterministically placing emitters on these photonic devices. However, the use of this technique to pattern luminescent lead halide perovskite nanocrystals (NCs), notable for their defect tolerance and impressive optical and spin coherence properties, for integration with optoelectronic devices remains unexplored. In this work, we additively deposit nanoscale CsPbBr3 NC features on photonic structures via EHD inkjet printing. We perform transmission electron microscopy of EHD inkjet printed NCs to demonstrate that the NCs’ structural integrity is maintained throughout the printing process. Finally, NCs are deposited with sub-micrometer control on an array of parallel silicon nitride nanophotonic cavities and demonstrate cavity–emitter coupling via photoluminescence spectroscopy. These results demonstrate EHD inkjet printing as a scalable, precise method to pattern luminescent nanomaterials for photonic applications.

A key obstacle for all quantum information science and engineering platforms is their lack of scalability. The discovery of emergent quantum phenomena and their applications in active photonic quantum technologies have been dominated by work with single atoms, self-assembled quantum dots, or single solid-state defects. Unfortunately, scaling these systems to many quantum nodes remains a significant challenge. Solution-processed quantum materials are uniquely positioned to address this challenge, but the quantum properties of these materials have remained generally inferior to those of solid-state emitters or atoms. Additionally, systematic integration of solution-processed materials with dielectric nanophotonic structures has been rare compared to other solid-state systems. Recent progress in synthesis processes and nanophotonic engineering, however, has demonstrated promising results, including long coherence times of emitted single photons and deterministic integration of emitters with dielectric nano-cavities. In this review article, these recent experiments using solution-processed quantum materials and dielectric nanophotonic structures are discussed. The progress in non-classical light state generation, exciton-polaritonics for quantum simulation, and spin-physics in these materials is discussed and an outlook for this emerging research field is provided.

Colloidal quantum dots (QDs) are promising candidates for single-photon sources with applications in photonic quantum information technologies. Developing practical photonic quantum devices with colloidal materials, however, requires scalable deterministic placement of stable single QD emitters. In this work, we describe a method to exploit QD size to facilitate deterministic positioning of single QDs into large arrays while maintaining their photostability and singlephoton emission properties. CdSe/CdS core/shell QDs were encapsulated in silica to both increase their physical size without perturbing their quantum-confined emission and enhance their photostability. These giant QDs were then precisely positioned into ordered arrays using template-assisted self-assembly with a 75% yield for single QDs. We show that the QDs before and after assembly exhibit antibunching behavior at room temperature and their optical properties are retained after an extended period of time. Together, this bottom-up synthetic approach via silica shelling and the robust template-assisted self-assembly offer a unique strategy to produce scalable quantum photonics platforms using colloidal QDs as single-photon emitters.

Engineering the dispersion of light in a metasurface allows for controlling the light–matter interaction strength between light confined in the metasurface and materials placed within its near-field. Specifically, engineering a flatband dispersion increases the photonic density of states, thereby enhancing the light–matter interaction. Here, we experimentally demonstrate a metasurface with a flat dispersion at visible wavelengths. We designed and fabricated a suspended one-dimensional gallium phosphide metasurface and measured the photonic band structure via energy-momentum spectroscopy, observing a photonic band that is flat over 10° of half angle at ∼590 nm. We integrated cadmium selenide nanoplatelets with the metasurface and measured coupled photoluminescence into the flatband. Our demonstration of a photonic flatband enables the possibility of integrating emerging quantum emitters to the metasurface with possible applications in nonlinear image processing and topological photonics.

No abstract

No abstract

No abstract

Previous work in non-hermitian photonics focused on homogeneous photonic molecules. Here, heterogeneous photonic molecules of nanobeam cavity coupled to a ring resonator are studied. Non-hermitian physics will be explored by using colloidal nanoplatelets.