Researchers at the National Physical Laboratory (NPL) in the United Kingdom have developed an all-optical diode. The new diode can be used in miniature photonic circuits and is expected to provide inexpensive and efficient photodiodes for micro-nano photonic chips, and thus for photonic chips and Photonic communications and other fields have important implications.

Modern Optics, Peking University researcher Xiao Yunfeng explained to Science and Technology Daily reporters: "diode current can be transferred in one direction, but blocking reverse current, the basic constituent elements of almost all electronic circuits, but requires a large conventional optical diode Block magneto-optical crystals severely hinder their integration at the micro/nano scale and become one of the major challenges in the field of integrated photonics.”

In the new study, the team led by Dr. Pascal Del Haye emitted light into a microresonator (glass microring on a silicon chip). Although the microring diameter is only comparable to human hair, it allows light to travel back and forth within the microring. Using the enhanced optical Kerr effect of microrings, the team created a new all-optical diode. The new diode can only transmit light in one direction and can be integrated into micro-nano photonic circuits, thus overcoming the limitation that diodes require large magneto-optic crystals.

Del Haye emphasized that "these diodes are expected to provide low-cost and efficient photodiodes for microchips. They will also pave the way for new integrated photonic circuits that can be used for optical computing and may also have a major impact on future photonic communications systems."

It is reported that Chinese scientists have also achieved good results in this field. For example, Dr. Dong Chunhua from the University of Science and Technology of China uses the micro-cavity optical interaction to obtain all-optically controlled nonreciprocal microcavity devices, including all-optical diodes and circulators. Wait.

Xiao Yunfeng said: "Although the latest research is not the first all-optical diode, the obtained device has the characteristics of simple operation and high isolation. It is a very promising solution. Of course, similar to the existing all-optical diode solution, it is based on resonance. The all-optical diodes of the cavity are often limited in bandwidth and can only operate in a narrow resonant mode. Further research is needed in the future to break through the limitations.”

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