10,927 research outputs found
Colloidal quantum dots enabling coherent light sources for integrated silicon-nitride photonics
Integrated photoniccircuits, increasingly based on silicon (-nitride), are at the core of the next generation of low-cost, energy efficient optical devices ranging from on-chip interconnects to biosensors. One of the main bottlenecks in developing such components is that of implementing sufficient functionalities on the often passive backbone, such as light emission and amplification. A possible route is that of hybridization where a new material is combined with the existing framework to provide a desired functionality. Here, we present a detailed design flow for the hybridization of silicon nitride-based integrated photonic circuits with so-called colloidal quantum dots (QDs). QDs are nanometer sized pieces of semiconductor crystals obtained in a colloidal dispersion which are able to absorb, emit, and amplify light in a wide spectral region. Moreover, theycombine cost-effective solution based deposition methods, ambient stability, and low fabrication cost. Starting from the linear and nonlinear material properties obtained on the starting colloidal dispersions, we can predict and evaluate thin film and device performance, which we demonstrate through characterization of the first on-chip QD-based laser
Status of Muon Collider Research and Development and Future Plans
The status of the research on muon colliders is discussed and plans are
outlined for future theoretical and experimental studies. Besides continued
work on the parameters of a 3-4 and 0.5 TeV center-of-mass (CoM) energy
collider, many studies are now concentrating on a machine near 0.1 TeV (CoM)
that could be a factory for the s-channel production of Higgs particles. We
discuss the research on the various components in such muon colliders, starting
from the proton accelerator needed to generate pions from a heavy-Z target and
proceeding through the phase rotation and decay ()
channel, muon cooling, acceleration, storage in a collider ring and the
collider detector. We also present theoretical and experimental R & D plans for
the next several years that should lead to a better understanding of the design
and feasibility issues for all of the components. This report is an update of
the progress on the R & D since the Feasibility Study of Muon Colliders
presented at the Snowmass'96 Workshop [R. B. Palmer, A. Sessler and A.
Tollestrup, Proceedings of the 1996 DPF/DPB Summer Study on High-Energy Physics
(Stanford Linear Accelerator Center, Menlo Park, CA, 1997)].Comment: 95 pages, 75 figures. Submitted to Physical Review Special Topics,
Accelerators and Beam
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Advances in test and measurement of the interface adhesion and bond strengths in coating-substrate systems, emphasising blister and bulk techniques
In this paper, recent advances in the minimum-destructive testing of the adhesion of coating-substrate systems are reviewed, focusing on key techniques such as micro- and nano-scale levels of indentation, scratching, laser-induced wave shock, as well as the blister and buckle approach. Along with adhesion failure tests, the latest and most extensive applications of the adhesion test methods in nano-, micro- and bulk-coating technology and the associated techniques to determine the minimum damage defects left on the coatings are discussed and their use reviewed
Optical Nanofibers: a new platform for quantum optics
The development of optical nanofibers (ONF) and the study and control of
their optical properties when coupling atoms to their electromagnetic modes has
opened new possibilities for their use in quantum optics and quantum
information science. These ONFs offer tight optical mode confinement (less than
the wavelength of light) and diffraction-free propagation. The small cross
section of the transverse field allows probing of linear and non-linear
spectroscopic features of atoms with exquisitely low power. The cooperativity
-- the figure of merit in many quantum optics and quantum information systems
-- tends to be large even for a single atom in the mode of an ONF, as it is
proportional to the ratio of the atomic cross section to the electromagnetic
mode cross section. ONFs offer a natural bus for information and for
inter-atomic coupling through the tightly-confined modes, which opens the
possibility of one-dimensional many-body physics and interesting quantum
interconnection applications. The presence of the ONF modifies the vacuum
field, affecting the spontaneous emission rates of atoms in its vicinity. The
high gradients in the radial intensity naturally provide the potential for
trapping atoms around the ONF, allowing the creation of one-dimensional arrays
of atoms. The same radial gradient in the transverse direction of the field is
responsible for the existence of a large longitudinal component that introduces
the possibility of spin-orbit coupling of the light and the atom, enabling the
exploration of chiral quantum optics.Comment: 65 pages, to appear in Advances in Atomic, Molecular and Optical
Physic
Roadmap on structured light
Structured light refers to the generation and application of custom light fields. As the tools and technology to create and detect structured light have evolved, steadily the applications have begun to emerge. This roadmap touches on the key fields within structured light from the perspective of experts in those areas, providing insight into the current state and the challenges their respective fields face. Collectively the roadmap outlines the venerable nature of structured light research and the exciting prospects for the future that are yet to be realized.Peer ReviewedPostprint (published version
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