APPARATUS: Continuum Minilite 10 Hz pulsed YAG laser (355 nm), YAG laser goggles, quartz sample tubes, phototransistor trigger, Instruments SA H20 Monochrometer, Rutgers P1100 Monochrometer Driver (scanning motor and control box), Hamamatsu R928 photomultiplier, high voltage power supply, Stanford Research Systems (SRS) Fast Preamplifier model SR240, SRS Gated Integrator and Boxcar Averager mod...

Layered 2D semiconductors have been widely exploited in photodetectors due to their excellent electronic and optoelectronic properties. To improve performance, photogating, photoconductive, photovoltaic, photothermoelectric, other effects used phototransistors photodiodes made with or hybrid structures. However, it is difficult achieve the desired high responsivity linear photoresponse simultan...

Microprocessor-Based Closed-Loop Motor Control A dedi~ated microprocessor control system was built from chip level using the Motorola M6800 family. The system has a keyboard and the interfaces for four LED displays, a phototransistor and a digital-to-analog converter. The system was designed to execute a closed loop motor control. The system accepts key input in RPM and drives the motor at the ...

Charge sensitive infrared phototransistors (CSIP) are well known for their capability for response spectrum tuning and single photon detection. In this paper, we established a physical model for a charge sensitive infrared phototransistor operating at 45μm wavelength using the Crosslight Apsys software. Several key physical mechanisms involved such as inter-subband optical transition and resona...