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.
Tunable nanophotonic resonators are an essential building block for material-integrated photonic systems and solidstate cavity quantum electrodynamic experiments. Matching the cavity resonance with the material optical transition is crucial for enhancing the light−matter interaction, leading to various associated phenomena that have important implications in quantum optics and optoelectronics. However, our inability to precisely control the resonant wavelength of nanofabricated optical cavities necessitates the use of postfabrication dynamical tuning, which is a challenging prospect, especially in cryogenic environments required for various quantum optical effects. Here, we realize a large in situ strain tuning of an integrated monolayer WSe 2 −gallium phosphide cavity device. We demonstrated tuning an on-substrate cavity with a quality (Q)-factor of ∼3500 at ∼780 nm by ∼5 nm without any degradation of the Q-factor at cryogenic temperature. The tunable cavity modes are manifested as cavity-enhanced monolayer exciton photoluminescence.
Using a cavity array made up of high Q nanocavities equipped with specially designed thermo-optic island heaters for independent control, we demonstrate a programmable device implementing tight-binding Hamiltonians with access to the full eigen-energy spectrum.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.