Monolithic integration of optical neurochip with variable sensitivity photodetector

A monolithic integration of an optical neurochip with variable interconnection capability is reported. The neurochip is a three-dimensional optoelectronic integrated circuit, in which a variable sensitivity photodetector is directly fabricated on a light emitting diode. The principle of operation and the fundamental characteristics of the monolithic neurochip are described in detail. The optical crosstalk was significantly reduced and the optical coupling efficiency between the light emitting diode and the variable sensitivity photodetector was improved as compared to the previous hybrid structure. The monolithic neurochip is suitable for a large scale integration because there is little optical crosstalk, high efficiency, and no need of optical alignment.<>