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Impact ionization [1,2], or electron-hole pair creation by charged particles, has been one of the central issues of semiconductor physics and devices. However, due to its complexity of the process, most experimental studies and their analyses have been macroscopic and phenomenological. This situation prevents us from exploring the fundamental physics of impact ionization and of high-energy charged...
We constructed a laser scanning terahertz (THz) imaging system for high-speed imaging by using a galvano scanner and an organic nonlinear optical crystal, DASC, as a two-dimensional THz emitter. Using this system, we succeeded in obtaining high-resolution THz images of a test sample.
Summary form only given. In the field of chemical analysis, the gas chromatograph (GC) has been widely used because of its flexibility, short measurement time and low running cost. Recently, high-sensitive detection is required for further improvement of analytical performance. To realize high sensitivity, excellent detector for GC is needed. Until now, many types of detectors have been developed...
Polarization reversal in a ferroelectric is accompanied by heat generation which causes a temperature rise depending on thermal boundary conditions. An adiabatic condition yields (E: electric field, D: electric displacement, C: heat capacity). The copolymer of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) copolymer is expected to generate a large amount of heat because of its large remanent...
The ATLAS detector at CERN's Large Hadron Collider (LHC) will be exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system will select potentially interesting events in order to reduce the read-out rate to about 200 Hz. The first trigger level is implemented in custom-built electronics and makes an initial fast selection based on detector data of coarse granularity...
3 dB of measured squeezing is reported for pulsed 1550-nm light generated by down-conversion in bulk PPLN. Using different pump focuses, single- and coincidence-counts in agreement with both thermal and Poissonian photon-pair distributions were obtained.
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