Linearity is a very important parameter to measure the performance of avalanche photodiodes (APDs) under high input optical power. In this paper, influence absorption layer on linearity APDs carefully studied by using bandgap engineering with structure model separated absorption, grading, charge, multiplication, and transit (SAGCMCT). The simulated results show that in hybrid device 1 dB compre...

Reducing the dark current of InGaAs/InP avalanche photodiodes (APDs) is an important way to improve its performance. Decreasing active size can reduce but sacrifice quantum efficiency. In this paper, metal–insulator-metal (MIM) microcavity integrated with APD, which converge light from tens micrometers several micrometers, so as compensate for loss detection efficiency caused by reduction APD. ...

A flow cytometer using a solid state light source and detector was designed and built. For illumination of the sample stream two types of diode lasers (670 nm and 780 nm) were tested in a set-up designed to differentiate human leukocytes by means of light scattering. The detector is an avalanche photodiode, which was used to detect the weak scattered light in the orthogonal direction. The new f...