Not only can it emit light on a chip, but it can also receive light at the same time. This was unimaginable in the past. The reporter recently learned from Nanjing University of Posts and Telecommunications that Prof. Wang Yongjin of the school discovered the physical phenomenon of quantum well diode light emission and detection coexistence, and On the basis of the development of a variety of homogeneous integrated optoelectronic chips, for the world's first. The research progress has been the latest issue of "Today's Semiconductor" special coverage.
'Homogeneity integration' is a problem in the industry. For a long time, optical emission, transmission, modulation and receiving devices have been divided into different research fields, and no one has linked them to research and development. For example, if we can integrate optical fiber probes and light sources in the future. Together, the patient's pain during gastroscopy will be greatly reduced.
In the experiment, Wang Yongjin discovered that the quantum well diode emits spectrum and the detection response spectrum overlaps. 'This shows that the quantum well diode device can be used as a light emitting and detecting device at the same time. It has the characteristics of simultaneous transmission and reception of the 'transceiver duplex' feature. Photoelectric detection The new physical nature and characteristics of the "physical coexistence of quantum well diode light emission and light detection" were first discovered by us.
Based on this discovery, Wang Yongjin developed a full-duplex visible light communication chip, an optical interconnection chip, a brain-like chip, and an IoT chip to prove the physical phenomenon of 'coexistence of light emission and light detection of a quantum well diode'. It is ubiquitous and responds to questions from the academic community.
This time, Wang Yongjin and the Nobel Prize-winning physics award winner Professor Tian Yehao jointly carried out the research on the homogeneous integrated photonic chip for the ultraviolet band, and based on the silicon substrate nitride wafer, the quantum well diode device was prepared on the same chip. At the same time, an inter-chip communication system was formed by interconnecting waveguides, and mechanically exfoliation technology was used to obtain a transferable ultraviolet homogenous integrated optoelectronic chip with a diameter of 0.8 mm and a thickness of 2 μm for the first time.
'As long as a small UV photonic chip, you can complete a series of complex procedures such as water purification, disinfection, detection, and communication.' Wang Yongjin said that as the research is further expanded, the application of homogeneous integrated optoelectronic chips will become more and more extensive.