1,252 research outputs found
From weak to strong coupling of localized surface plasmons to guided modes in a luminescent slab
We investigate a periodic array of aluminum nanoantennas embedded in a
light-emitting slab waveguide. By varying the waveguide thickness we
demonstrate the transition from weak to strong coupling between localized
surface plasmons in the nanoantennas and refractive index guided modes in the
waveguide. We experimentally observe a non-trivial relationship between
extinction and emission dispersion diagrams across the weak to strong coupling
transition. These results have implications for a broad class of photonic
structures where sources are embedded within coupled resonators. For
nanoantenna arrays, strong vs. weak coupling leads to drastic modifications of
radiation patterns without modifying the nanoantennas themselves, thereby
representing an unprecedented design strategy for nanoscale light sources
Substrate conformal imprint fabrication process of synthetic antiferromagnetic nanoplatelets
Methods to fabricate and characterize monodisperse magnetic nanoplatelets for
fluid/bio-based applications based on spintronic thin-film principles are a
challenge. This is due to the required top-down approach where the transfer of
optimized blanket films to free particles in a fluid while preserving the
magnetic properties is an uncharted field. Here, we explore the use of
substrate conformal imprint lithography (SCIL) as a fast and cost-effective
fabrication route. We analyze the size distribution of nominal 1.8 um and 120
nm diameter platelets and show the effect of the fabrication steps on the
magnetic properties which we explain through changes in the dominant
magnetization reversal mechanism as the size decreases. We show that SCIL
allows for efficient large-scale platelet fabrication and discuss how
application-specific requirements can be solved via process and material
engineering
Chronic kidney disease after lung transplantation in a changing era
Lung transplant (LTx) physicians are responsible for highly complex post-LTx care, including monitoring of kidney function and responding to kidney function loss. Better survival of the LTx population and changing patient characteristics, including older age and increased comorbidity, result in growing numbers of LTx patients with chronic kidney disease (CKD). CKD after LTx is correlated with worse survival, decreased quality of life and high costs. Challenges lie in different aspects of post-LTx renal care. First, serum creatinine form the basis for estimating renal function, under the assumption that patients have stable muscle mass. Low or changes in muscle mass is frequent in the LTx population and may lead to misclassification of CKD. Second, standardizing post-LTx monitoring of kidney function and renal care might contribute to slow down CKD progression. Third, new treatment options for CKD risk factors, such as diabetes mellitus, proteinuria and heart failure, have entered clinical practice. These new treatments have not been studied in LTx yet but are of interest for future use. In this review we will address the difficult aspects of post-LTx renal care and evaluate new and promising future approaches to slow down CKD progression.</p
Generic nano-imprint process for fabrication of nanowire arrays
A generic process has been developed to grow nearly defect free arrays of
(heterostructured) InP and GaP nanowires. Soft nanoimprint lithography has been
used to pattern gold particle arrays on full 2 inch substrates. After lift-off
organic residues remain on the surface, which induce the growth of additional
undesired nanowires. We show that cleaning of the samples before growth with
piranha solution in combination with a thermal anneal at 550 C for InP and 700
C for GaP results in uniform nanowire arrays with 1% variation in nanowire
length, and without undesired extra nanowires. Our chemical cleaning procedure
is applicable to other lithographic techniques such as e-beam lithography, and
therefore represents a generic process.Comment: 12 pages, 4 figures, 2 table
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