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小木虫论坛-学术科研互动平台 » 专业学科区 » 物理 » 交叉学科 » 光也能产生巨大的磁效应
北京石油化工学院2026年研究生招生接收调剂公告
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yexuqing

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1楼 2011-04-19 09:46:56
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quanbaogang

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找到源头了，leongoall给的文章链接是对的。致敬~！
University of Michigan researchers were reported to have found a way to produce solar power without using the traditional semiconductor-based solar cells, several science news sites reported on Wednesday.

According to Stephen Rand, a professor in the departments of Electrical Engineering and Computer Science, Physics and Applied Physics, the researchers discovered a way to make an “optical battery.”



Solar Panels
Image Credit: Solarnavigator.netRand and his colleagues found out that at the right intensity, what was thought to be a very weak magnetic field of light by scientists for many years, can generate magnetic effects that are 100 million times stronger than previously expected. These magnetic effects were said to have a strength equivalent to a strong electric effect.

“This could lead to a new kind of solar cell without semiconductors and without absorption to produce charge separation. In solar cells, the light goes into a material, gets absorbed and creates heat. Here, we expect to have a very low heat load. Instead of the light being absorbed, energy is stored in the magnetic moment. Intense magnetization can be induced by intense light and then it is ultimately capable of providing a capacitive power source,” Rand was quoted saying.

William Fisher, a doctoral student in applied physics said that this is possible due to a previously undetected brand of “optical rectification.” Optical rectification was said to be only detected in crystalline materials that have a certain symmetry. However, Rand and Fisher found that under the right circumstances and in other types of materials, the light’s magnetic field can also create optical rectification.

In this new technique, instead of using semiconductor, the light will be shone through a material that does not conduct electricity, such as glass. Light must be focused to an intensity of 10 million watts per square centimeter. Although sunlight is not this intense, Fisher said that new materials are being sought that would work with lower intensities.

The researchers said that this new technique could make a cheaper solar power. “To manufacture modern solar cells, you have to do extensive semiconductor processing. All we would need are lenses to focus the light and a fiber to guide it. Glass works for both. It’s already made in bulk, and it doesn’t require as much processing. Transparent ceramics might be even better,” Fisher explained.

This summer, the researchers will experiment on harnessing this power with laser light, and then with sunlight.

Their paper is titled “Optically-induced charge separation and terahertz emission in unbiased dielectrics.” University of Michigan was said to be pursuing patent protection for the intellectual property.
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10楼2011-04-20 09:07:13
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janecool

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如果光有磁矩的话，那可能光就不是基本粒子了，可能光子就有内部结构了
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相信会有属于你的精彩
2楼2011-04-19 10:33:32
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我玲9135

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将来得奖的人
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光子是什么？什么也不是。
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Onlytheeasydaywasyesterday.
3楼2011-04-19 14:02:36
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quanbaogang

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想看看这篇文章，不知道楼主能否提供点信息？
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4楼2011-04-19 16:49:06
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