Thermoelectric readout in a graphene terahertz (THz) radiation detector requires p- n junction across the channel. Even without an intentional junction, two latent junctions can exist vicinity of electrodes/antennas through proximity to metal. In symmetrical structure, these are connected back-to-back and therefore counterbalance each other with regard rectification ac signal. Because Peltier e...

Abstract The perovskite polycrystalline thin film detector fabricated by solution method is a promising low‐cost, scalable technology for radiation imaging, but its volume limits the sensing efficiency high‐energy X‐ray photons. This work reports 2D photo‐diodes with detection gain when visible and Detailed power temperature‐dependent device characterizations reveal charge multiplication effect...

Silicon photomultipliers (SiPM) are recent detectors studied by many groups. Their proprieties (compact form, insensitivity to magnetic fields, low voltage power supplies...) are promising for various scientific fields, from high energy physics calorimetry to medical imaging application. An accurate measurement of the SiPM parameters is needed to integrate these devices in experimentation. Abso...

The light gains of a detector system (PMT and scintillator) is characterized by the number photoelectrons produced per unit energy (usually MeV). In this study, results gain tests for 10 Hamamatsu R11833 model photomultiplier tubes (PMT) are shown. Various radioactive sources were used in conjunction with EJ309 liquid scintillator to determine gain. was determined comparing size signal generate...

This paper addresses OFDM transmission over optical links with high spectral efficiency, i.e. by using highorder QAM-modulation schemes as a mapping method prior to the OFDM multicarrier representation. Low and moderate cost optics which is mandatory in access and in metro applications is assumed. Here we address especially direct detection receivers using photo detectors without the need for l...

This article describes the ber optic based calibration system installed at the High Resolution Fly s Eye HiRes astro particle physics observatory The HiRes detec tors measure ultra violet scintillation light from distant extensive air showers This automated calibration system delivers light from a frequency tripled nm YAG laser to the photo multiplier tubes of the HiRes II detectors c El sevier...

One possibility to make a fast and radiation resistant shower maximum (SM) detector is to use a secondary emitter as an active element. We present below test beam results, obtained with different types of photo detectors based on micro channel plates (MCP) as secondary emitter. The SM time resolution we obtained for this new type of detector is at the level of 20-30 ps. We estimate that a signi...