Currently, there are no UV-light transparent core filaments smaller than a hair.
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First of all, ultraviolet transparent core refers to a magnetic storage medium that can operate stably under ultraviolet light, and it is usually prepared on a semiconductor material. Because magnetic storage media require high permeability and low coercivity, it is usually prepared from nanomaterials.
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Second, the smallest ultra-violet transparent core filament on the market is about 100 nanometers in diameter, much larger than the diameter of a human hair.
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Finally, UV transparent core filaments have a wide range of applications, such as high-density information storage, quantum computers, optical communications, and so on. These fields have high requirements for the performance and stability of UV-transparent magnetic core filament, so the manufacturing process and technical requirements are also very high.
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In short, there is no UV transparent core filament smaller than a hair on the market at present, but the prospects in this field are very good, and it is believed that there will be more technological breakthroughs in the future, which is expected to achieve a smaller size of UV transparent core filament.