Mads Engelund

Measurements of scattered light on a microchip flow cytometer with integrated polymer based optical elements.

Flow cytometry is widely used for analyzing microparticles, such as cells and bacteria. In this paper, we report an innovative microsystem, in which several different optical elements (waveguides, lens and fiber-to-waveguide couplers) are integrated with microfluidic channels to form a complete microchip flow cytometer. All the optical elements, the microfluidic system, and the fiber-to-waveguide couplers were defined in one layer of polymer (SU-8, negative photoresist) by standard photolithography. With only a single mask procedure required, all the fabrication and packaging processes can be finished in one day. Polystyrene beads were measured in the microchip flow cytometer, and three signals (forward scattering, large angle scattering and extinction) were measured simultaneously for each bead. To our knowledge this is the first time forward scattered light and incident light extinction were measured in a microsystem using integrated optics. The microsystem can be applied for analyzing different kinds of particles and cells, and can easily be integrated with other microfluidic components.

Δ self-consistent field method to obtain potential energy surfaces of excited molecules on surfaces

We present a modification of the

Density functional theory based screening of ternary alkali-transition metal borohydrides: A computational material design project

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Calcium mobilization stimulates Dictyostelium discoideum shear-flow-induced cell motility

self-consistent field (

Atomic-scale model for the contact resistance of the nickel-graphene interface

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Tunneling spectroscopy of close-spaced dangling-bond pairs in Si(001):H

) method of calculating energies of excited states in order to make it applicable to resonance calculations of molecules adsorbed on metal surfaces, where the molecular orbitals are highly hybridized. The

A tunable electronic beam splitter realized with crossed graphene nanoribbons

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Ab initio vibrations in nonequilibrium nanowires

approximation is a density-functional method closely resembling standard density-functional theory (DFT), the only difference being that in

Localized Edge Vibrations and Edge Reconstruction by Joule Heating in Graphene Nanostructures

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Interaction of a conjugated polyaromatic molecule with a single dangling bond quantum dot on a hydrogenated semiconductor

one or more electrons are placed in higher lying Kohn-Sham orbitals instead of placing all electrons in the lowest possible orbitals as one does when calculating the ground-state energy within standard DFT. We extend the