In brief

Abstract

PAGE 1596 Researchers in France and Germany have developed a GaAs-based Fabry-Pérot cavity photoconductor designed for sub-sampling radio frequencies and sub-THz waves. The GaAs layer is grown at low temperature and photoconductive response is triggered by a 1550 nm pulsed laser. The photoconductor paves the way for analogue-to-digital signal conversion in ultrafast optoelectronics. PAGE 1598 A fully-vertical GaN-on-silicon Schottky barrier diode (SBD) is presented in work from Japan. The SBD is made without using wafer bonding or Si substrate removal processes to realise a device with high breakdown voltages and efficient thermal management. Reported electronic properties of the diode demonstrate it to be a cost-effective and energy efficient power device. A low-temperature-GaAs photoconductor controlled by a 1550 nm mode-locked laser PAGE 1578 A sensor for accurate fatigue failure detection in ferromagnetic materials is proposed in work from China. The pick-up coil of the designed sensor is attached by a spring to reduce lift-off events-reducing errors in surface contact and measurements. Voltage signals between the pick-up coil and material surface are used to accurately assess structural damage and stress in ferromagnetic materials. Fabrication of a cost effective and energy efficient fully-vertical GaN-on-silicon Schottky diode PAGE 1606 A geosynchronous synthetic aperture radar (GEO-SAR) system is used to realise time-variant total electron count (TEC) real-time measurements in work from the UK and China. The process is reported to be much simpler than conventional ionospheric sounding methods for estimating TEC with advantages including higher measuring accuracy, no requirement for atmospheric sounding equipment and superior compensation for ionospheric effects. Accurate fatigue detection in ferromagnetic materials with a sensor reduce lift-off events PAGE 1576 Researchers from China report a stopping criterion for belief propagation (BP) decoding of polar codes. The criterion uses the frozen bit error rate to prevent unnecessary computational iterations during decoding. Simulation results show that this approach can be used to determine if a polar code has been successfully decoded with a lower computational complexity than previously reported methods. Using geosynchronous synthetic aperture radar for the accurate measurement of real-time total electron count A stopping criteria for belief propagation based on the frozen bit error rate is proposed for polar code decoding