Researchers at the National Physical Laboratory (NPL) in the UK have made a breakthrough by developing an all-optical diode. This innovative device has the potential to revolutionize miniature photonic circuits, offering a low-cost and efficient alternative for micro- and nano-scale photonic chips. The development is expected to significantly impact fields such as photonic communications, optical computing, and integrated photonics.
Xiao Yunfeng, a researcher at Peking University's Institute of Modern Optics, explained that traditional diodes allow current to flow in one direction while blocking it in the reverse. They are essential components in electronic circuits. However, existing optical diodes rely on large magneto-optic crystals, which limit their integration into small-scale systems. This has been a major challenge in the field of integrated photonics.
In this new study, led by Dr. Pascal Del Haye, researchers used a microresonator—a glass microring on a silicon chip—to create an all-optical diode. Despite its tiny size, comparable to a human hair, the microring allows light to circulate multiple times, enhancing the optical Kerr effect. This enabled the team to design a unidirectional light transmission system that can be easily integrated into photonic circuits, eliminating the need for bulky magneto-optic materials.
Del Haye emphasized that the new diodes could provide affordable and efficient solutions for microchips, paving the way for advanced integrated photonic circuits. These circuits could play a key role in optical computing and may transform future photonic communication systems.
Chinese scientists have also made significant progress in this area. For instance, Dr. Dong Chunhua from the University of Science and Technology of China has developed all-optically controlled nonreciprocal devices using microcavity interactions, including all-optical diodes and circulators.
Xiao Yunfeng noted that while this isn't the first all-optical diode, the new device stands out for its simplicity and high isolation, making it a promising candidate. However, like other similar solutions, it still faces limitations in bandwidth and operates within narrow resonant modes. Further research is needed to overcome these challenges and expand the practical applications of such devices.
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LCD (short for Liquid Crystal Display) liquid crystal display. The LCD structure is to place a liquid crystal cell between two parallel glass substrates. The lower substrate glass is equipped with TFT (Thin Film Transistor), and the upper substrate glass is equipped with a color filter. The liquid crystal molecules are controlled by the signal and voltage changes on the TFT. Rotate the direction, so as to control whether the polarized light of each pixel point is emitted or not to achieve the purpose of display. LCD has replaced CRT as the mainstream, and the price has dropped a lot, and it has become fully popular.
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