Engineering topics
Muller, R.
Publications and source records attributed to Muller, R..
Combined search for neutrinos from dark matter self-annihilation in the Galactic Center with ANTARES and IceCube
In this work, we present the results of the first combined dark matter search targeting the Galactic Centre using the ANTARES and IceCube neutrino telescopes. For dark matter particles with masses from 50 to 1000 GeV, the sensitivities on the self-annihilation cross section set by ANTARES and IceCube are comparable, making this mass range particularly interesting for a joint analysis. Dark matter self-annihilation through the $\tau^+\tau^-$, $\mu^+\mu^-$, $b\bar{b}$ and $W^+W^-$ channels is considered for both the Navarro-Frenk-White and Burkert halo profiles. In the combination of 2,101.6 days of ANTARES data and 1,007 days of IceCube data, no excess over the expected background is observed. Limits on the thermally-averaged dark matter annihilation cross section $\langle\sigma_A\upsilon\rangle$ are set. These limits present an improvement of up to a factor of two in the studied dark matter mass range with respect to the individual limits published by both collaborations. When considering dark matter particles with a mass of 200 GeV annihilating through the $\tau^+\tau^-$ channel, the value obtained for the limit is $7.44 \times 10^{-24} \text{cm}^{3}\text{s}^{-1}$ for the Navarro-Frenk-White halo profile. For the purpose of this joint analysis, the model parameters and the likelihood are unified, providing a benchmark for forthcoming dark matter searches performed by neutrino telescopes.
Analog diffractive optics on flat and non-flat substrates: electron-beam fabrication and applications
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1310 nm quantum dot DFB lasers with high dot density and ultra-low linewidth-power product
Laterally coupled distributed feedback lasers using high-density InAs quantum dots-in-a-well (DWELL) active region demonstrate a nominal wavelength of 1310 nm, a linewidth as small as 68 kHz, and a linewidth-power product of 100 kHz-mW.
Electron-beam fabrication of analog-relief diffractive optics of non-flat substrates at Jet Propulsion Laboratory
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Fabrication of Laterally Coupled InGaAsSb-GaSb-AlGaAsSb DFB Laser Structures
In this paper, the materials growth, device processing and development of the necessary drive electronics for an antimony based tunable diode laser system are discussed.
Diffractive Optical Elements for Spectral Imaging
Diffractive optical elements fabricated on flat and non-flat substrates frequently act as dispersive elements in imaging spectrometers. We describe the design and electron-beam fabrication of blazed and computer-generated-hologram gratings for slit and tomographic imaging spectrometers.
Diffractive Optic Fluid Shear Stress Sensor
Light scattering off particles flowing through a two-slit inteference pattern can be used to measure the shear stress of the fluid. We have designed and fabricated a miniature diffractive optic sensor based on this principle.
Diffractive Optical Elements for Spectral Imaging
Diffractive optical elements fabricated on flat and non-flat substrates frequently act as dispersive elements in imaging spectrometers. We describe the design and electron-beam fabrication of blazed and computer-generated-hologram gratings for slit and tomographic imaging spectrometer.
Diffractive Optic Fluid Shear Stress Sensor
Light scattering off particles flowing through a two-slit interference pattern can be used to measure the shear stress of the fluid. We have designed and fabricated a miniature diffractive optic sensor based on this principle.
Stitching Error Reduction in Electron Beam Written Gratings
A multiple-write electron beam lithography techniques is described as linear filter on the grating spatial frequency spectrum.
Fabrication of Laterally Coupled Distributed Feedback Laser Structures by Two Step RIE in InGaAsSb-AlGaAsSb Material System Grown by MBE
Data is presented on the fabrication of first order gratings in GaSb and AlGaAsSc layers by chlorine-based reactive ion etching (RIE).
Multi-Bandwidth Frequency Selective Surfaces for Near Infrared Filtering: Design and Optimization
Frequency selective surfaces are widely used in the microwave and millimeter wave regions of the spectrum for filtering signals.
Packaging and Testing of Mode-Locked Lasers
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Multi-Wavelength Arrays of Mode-Locked Lasers for WDM Applications
The continued need for increased bandwidth is driving the pursuit of both increased speed in TDM and more channels in WDM for fiber optic communication systems.