Colloidal quantum dots (QDs) are now being used as the new generation of phosphor for displays. White light is obtained by combining the blue emission of a diode with green and red population of QDs. Having bicolor emission within a single nanocrystal population can be even more convenient. Here, we demonstrate that bicolor emission can be obtained from 2D nanoplatelets (NPLs) with a core/crown geometry. In CdSe/CdTe NPLs with type II band alignment, only the charge transfer emission was observed so far due to the very fast (
While the integration of nanocrystals
as an active medium
for optoelectronic
devices progresses, light management strategies are becoming required.
Over recent years, several photonic structures (plasmons, cavities,
mirrors, etc.) have been coupled to nanocrystal films to shape the
absorption spectrum, tune the directionality, and so on. Here, we
explore a photonic equivalent of the acoustic Helmholtz resonator
and propose a design that can easily be fabricated. This geometry
combines a strong electromagnetic field magnification and a narrow
channel width compatible with efficient charge conduction despite
hopping conduction. At 80 K, the device reaches a responsivity above
1 A·W–1 and a detectivity above 1011 Jones (3 μm cutoff) while offering a significantly faster
time-response than vertical geometry diodes.
Photons have been identified early on as a very good candidate for quantum technologies applications, as carriers of quantum information, either by polarization encoding, time encoding or spatial encoding. Quantum cryptography, quantum communications, quantum networks and quantum computing are some of the applications targeted by the so called quantum photonics. Nevertheless, it was also clear at an early stage that bulk optics for handling quantum states of light would not be the best option for these technologies. More recently, single photons, entangled photons and quantum light in general have been coupled to integrated approaches coming from classical optics in order to meet the requirements of scalability, reliability and efficiency for quantum technologies. In this article, we describe our recent advances using elongated optical nano-fibers. We also present our latest results on nanocrystals made of perovskites and discuss some of their quantum properties. Finally, we will discuss the general steps necessary in order to couple these nanoemitters efficiently with our photonic platform, based on taperd optical nanofibers.
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.