A low terahertz broadband tunable absorber was proposed, which composed of vanadium oxide (VO2) film and nematic liquid crystal layer. The simulation results show that the absorption is great than 90% in frequency range 0.458–1.1492 THz. tuning realized by increasing temperature to modulate VO2 transited into metal state. Since dielectric constant can be adjusted bias voltage, without changing ...

The Lorentz group is the fundamental language for space-time symmetries of relativistic particles. This group can these days be derived from the symmetries observed in other branches of physics. It is shown that this group can be derived from optical filters. The group O(2,1) is appropriate for attenuation filters, while the O(3) group describes phase-shift filters. The combined operation leads...

Mr. Ilir F. Progri received his Diploma of Engineer Degree in Electrical Engineering from Polytechnic University of Tirana, Albania in 1994. He received his MS degree in Electrical Engineering from Electrical and Computer Engineering Department, Worcester Polytechnic Institute (WPI) in 1997. He is currently a graduate student of the Electrical and Computer Engineering Department, WPI, perusing ...

We present an approach for manipulating light in an optical fiber where efficient modal field interaction is achieved between modes propagating in an air-silica microstructure optical fiber and micro-fluids incorporated in the air-holes of the fiber. We demonstrate this apporach in terms of applications to tunable devices.

GSI, Darmstadt, Germany Abstract: Hamamatsu Multi Anode Photomultipliers H8500-03 are currently foreseen as photodetector for the CBM-RICH. To operate the H8500-03 with the nXYter chip, which is a prototype of a future CBM data acquisition readout, the photomultiplier signals have to be strongly attenuated. An attenuator in form of a charge divider has been developed and tested. After laborator...