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Gamma-ray polarimetry is a new powerful tool to study the processes responsible for the emission from astrophysical sources and the environments in which this emission takes place. Few successful polarimetric measurements have however been performed thus far in the gamma-ray energy band due to the difficulties involved. POLAR is a dedicated polarimeter designed to perform high precision measurements...
The European XFEL is an extremely brilliant Free Electron Laser Source with a very demanding pulse structure: trains of 2700 X-Ray pulses are repeated at 10 Hz. The pulses inside the train are spaced by 220 ns and each one contains up to 1012 photons of 12.4 keV, while being ≤ 100 fs in length. AGIPD (Adaptive Gain Integrating Pixel Detector) is a hybrid 1M-pixel detector developed by DESY, PSI, and...
AGIPD is a hybrid pixel X-ray detector developed by a collaboration between Deutsches Elektronen-Synchrotron (DESY), Paul-Scherrer-Institute (PSI), University of Hamburg and the University of Bonn. The detector is designed to comply with the requirements of the European XFEL. The radiation tolerant Application Specific Integrated Circuit (ASIC) is designed with the following highlights: high dynamic...
The European X-Ray Free Electron Laser (XFEL) will provide ultra short, highly coherent X-ray pulses which will revolutionize scientific experiments in a variety of disciplines spanning physics, chemistry, materials science, and biology.
To advance the science of lidar sensing of complex ice and snow surfaces as well as in support of the upcoming ICESat- 2 mission, this paper establishes a framework to theoretically study a spaceborne micropulselidar returns from snow and ice surfaces. First, the anticipated lidar return characteristics for a sloped non-penetrating surface is studied when measured by a multiple-channel photon-counting...
We review our recent results in the development of nanostructured photonic metamaterials which provide unprecedented levels of active (nonlinear, switchable, tunable) control over light on the sub-wavelength scale.
This paper presents a novel MEMS configuration for three dimensional on-chip fine positioning and mechanical fixing of a ball lens. A MEMS lens holder, which consists of a suspended mass, is attached onto a MEMS active alignment platform to achieve precision alignment and fixing of a ball lens with a diameter of 300µm in silicon photonics packaging. The operational principles of the system as well...
By leveraging on the wealth of Si-CMOS technology know-how and the largely available infrastructures, the fundamental photonic device building blocks and circuit integration platform, essential for the realization of the electronic-photonic integrated circuit (EPIC), have been successfully developed. This presentation gives an overview on the current status of this critical technology and provides...
By leveraging on the wealth of Si-CMOS technology know-how and the largely available infrastructures, the fundamental photonic device building blocks and circuit integration platform, essential for the realization of the electronic-photonic integrated circuit (EPIC), have been successfully developed. This presentation gives an overview on the current status of this critical technology and provides...
This paper reports a novel silicon platform with integrated MEMS actuators, which is used for fine-positioning and locking of a ball-lens, to address the optical coupling issues in silicon photonics packaging. The fine-positioning and locking function of the ball-lens have been successfully demonstrated by the developed prototype silicon platform. The main adjusting actuator delivered a large force...
Research into the limits of electrical interconnects indicates that metal wire is unlikely to be the ultimate solution to support the growing functionalities of next generation microprocessor. Severe information latency and power consumption are key technological challenges facing the traditional copper interconnects which impose tremendous constraints to keep up with the performance roadmap known...
We numerically analyze the nonlinear propagation of femtosecond pulses in nonlinear photonic-crystal fiber (PCF) with anomalous dispersion. The results show efficient spectral compression of chirp-free femtosecond pulses at 1550-nm wavelength is induced in PCF. The compressed spectral width can be controlled by the input pulse power.
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