The development of photodiodes in the UK will have a major impact on the photonics industry

Researchers at the National Physical Laboratory (NPL) in the UK have made a breakthrough by developing an all-optical diode. This new device has the potential to revolutionize miniature photonic circuits, offering affordable and efficient photodiodes for micro- and nano-scale photonic chips. As a result, it could significantly impact fields like 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 opposite. They are essential components in electronic circuits. However, optical diodes today rely on bulky magneto-optic crystals, which limit their integration at the micro or nano scale. This has been a major challenge in the field of integrated photonics. In this latest study, led by Dr. Pascal Del Haye, the team used a microresonator—a tiny glass ring on a silicon chip. Despite its size, comparable to a human hair, the microring allows light to circulate back and forth. By leveraging the enhanced optical Kerr effect, they created a novel all-optical diode that only transmits light in one direction. This makes it compatible with micro- and nano-scale photonic circuits, eliminating the need for large magneto-optic crystals. Del Haye highlighted the potential of these diodes, stating that they could provide cost-effective and efficient solutions for microchips. They may also enable new integrated photonic circuits for optical computing and could play a key role in future photonic communication systems. Chinese researchers have also made significant progress in this area. For example, Dr. Dong Chunhua from the University of Science and Technology of China has developed all-optically controlled nonreciprocal devices using micro-cavity interactions, including all-optical diodes and circulators. Xiao Yunfeng noted that while this isn't the first all-optical diode, the new device offers simplicity and high isolation, making it a promising solution. However, like other cavity-based all-optical diodes, it is limited in bandwidth and operates within a narrow resonant range. Further research is needed to overcome these challenges and expand the capabilities of such devices.

LCD Screen

brightness
LCD is a substance between solid and liquid. It can't emit light by itself, so it needs additional light source. Therefore, the number of lamps is related to the brightness of the Liquid Crystal Display. The earliest liquid crystal displays had only two upper and lower tubes, the lowest of the popular type was four lamps, and the high-end one was six lamps. The four-lamp design is divided into three types of placement: one is that there is a lamp on each of the four sides, but the disadvantage is that there will be dark shadows in the middle. The solution is to arrange the four lamps from top to bottom. The last one is the "U"-shaped placement form, which is actually two lamp tubes produced by two lamps in disguise. The six-lamp design actually uses three lamps. The manufacturer bends all three lamps into a "U" shape, and then places them in parallel to achieve the effect of six lamps.
Tip: Brightness is also a more important indicator. The brighter the LCD, the brighter the LCD, it will stand out from a row of LCD walls. The highlight technology we often see in CRT (ViewSonic is called highlight, Philips is called display Bright, BenQ is called Rui Cai) is to increase the current of the shadow mask tube to bombard the phosphor to produce a brighter effect. Such a technology is generally traded at the expense of image quality and the life of the display. All use this The products of this kind of technology are all bright in the default state, you always have to press a button to implement, press 3X bright to play the game; press again to turn to 5X bright to watch the video disc, a closer look is blurred, you need to watch The text has to be honestly returned to the normal text mode. This design actually prevents you from frequently highlighting. The principle of LCD display brightness is different from that of CRT. They are realized by the brightness of the backlight tube behind the panel. Therefore, the lamp has to be designed more so that the light will be uniform. In the early days when selling LCDs, it was a great thing to tell others that there were three LCDs. But at that time, Chi Mei CRV came up with a six-lamp technology. In fact, the three tubes were bent into a "U" shape. The so-called six; such a six-lamp design, plus the strong luminescence of the lamp itself, the panel is very bright, such a representative work is represented by VA712 in ViewSonic; but all bright panels will have a fatal injury , The screen will leak light, this term is rarely mentioned by ordinary people, the editor personally thinks it is very important, light leakage means that under a completely black screen, the liquid crystal is not black, but whitish and gray. Therefore, a good LCD should not emphasize brightness blindly, but more emphasis on contrast. ViewSonic's VP and VG series are products that do not emphasize brightness but contrast!

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