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[交流] 光也能产生巨大的磁效应已有12人参与

光也能产生巨大的磁效应
有望开发出存储太阳能的“光电池”
发布时间: 2011-04-18  |   作者:常丽君
http://www.stdaily.com 2011年04月18日 来源: 科技日报 作者: 常丽君
  本报讯  据美国物理学家组织网近日报道,密歇根大学研究人员发现光也能产生巨大的磁效应,有望开发出存储太阳能的“光电池”,替代传统的半导体太阳能电池。该研究发表在最近出版的《应用物理学》杂志上,校方正在为该方法申请专利保护。
  这种制造“光电池”的方法可能推翻物理学的百年教条。光具有电性和磁性,但一直以来,科学家认为光的磁场效应非常弱,可以被忽略。

  密歇根大学电工程与计算机科学、物理与应用物理系教授斯蒂芬·兰德和同事发现,当光以适当的强度通过一种绝缘材料时,光场所产生的磁效应比以前预期的要强一亿倍,在这种情况下,磁感应强度相当于很强的电效应。该方法的原理是此前未曾研究过的“光整流”,研究人员威廉姆·菲舍说,传统光整流中,光只能通过其电场效应将一些特殊的对称晶体材料中正负电荷分开形成电压,而新研究发现,在适当的条件下,光在其他材料中能通过磁场效应产生“光整流”。

  兰德解释说:“在传统太阳能电池中,光进入材料被吸收,产生热量分离电荷。在我们的方法中,光不是被吸收,而是将能量存储在磁矩中,这将带来一种不需要半导体的新型太阳能电池,热负荷很低。强光也能产生很高的磁感应强度,最终提供一种类似电容供电器的光容式电源。”

  新技术将使太阳能发电更廉价。研究人员预计,使用改良材料可使太阳能转换效率达到10%,这相当于目前商业级的太阳能电池。今年夏天他们将在实验室里利用激光研究,然后拓展到太阳光。

  “目前制造太阳能电池需要大量的半导体加工工序。而我们只需一些镜片来集聚阳光,一些纤维来传导。玻璃就是很好的材料,透明陶瓷可能会更好。不需要复杂的工序。”菲舍说。

  (常丽君)  

(科技日报)
本篇文章来源于 科技网|www.stdaily.com
原文链接:http://www.stdaily.com/kjrb/content/2011-04/18/content_295699.htm
本篇文章来源于 科技网|www.stdaily.com
原文链接:http://www.stdaily.com/kjrb/content/2011-04/18/content_295699.htm
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janecool

铁杆木虫 (著名写手)


小木虫(金币+0.5):给个红包,谢谢回帖
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
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

铁杆木虫 (著名写手)

将来得奖的人


小木虫(金币+0.5):给个红包,谢谢回帖
光子是什么?什么也不是。
Onlytheeasydaywasyesterday.
3楼2011-04-19 14:02:36
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quanbaogang

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖
想看看这篇文章,不知道楼主能否提供点信息?
4楼2011-04-19 16:49:06
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leongoall

专家顾问 (知名作家)

P-M-I之初生牛犊


小木虫(金币+0.5):给个红包,谢谢回帖
哇!!这个发现如果是真的,那就太强了!!

我找了一篇文章,不知道是不是楼主所说的这篇,大家看看吧!

[ Last edited by leongoall on 2011-4-19 at 18:22 ]
趁年轻,多折腾!曾年轻,折腾过?!
5楼2011-04-19 18:11:44
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leongoall

专家顾问 (知名作家)

P-M-I之初生牛犊


小木虫(金币+0.5):给个红包,谢谢回帖
引用回帖:
Originally posted by quanbaogang at 2011-04-19 16:49:06:
想看看这篇文章,不知道楼主能否提供点信息?

我下了一篇,不过不知道对不对,你点上面你的链接下载吧!
趁年轻,多折腾!曾年轻,折腾过?!
6楼2011-04-19 18:23:28
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quanbaogang

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖
感谢楼上,我看了摘要感觉有些相关,但本帖子报道的应该不是太拉赫兹频率的电磁波。好像作者也不对
7楼2011-04-20 08:43:27
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quanbaogang

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖
在WEB OF SCIENCE上搜了一下,作者是对的,Fisher是老板?先找到他们的网站再说吧……
8楼2011-04-20 08:53:07
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shenyuxiang

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theoretical
9楼2011-04-20 08:54:37
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quanbaogang

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖
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.
10楼2011-04-20 09:07:13
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