资深农民工分享 http://blog.sciencenet.cn/u/马红孺 上海交通大学机动学院教授http://www.physics.sjtu.edu.cn/hrma

博文

自然中国: Optical devices: Window replacement

已有 5321 次阅读 2008-8-8 12:53 |个人分类:科研笔记|系统分类:科研笔记| 变换光学

Nature China 对我们的那个窗子做了加亮(亮点, ... )处理, 这是网址

http://www.naturechina.com.cn/nchina/2008/080806/full/nchina.2008.181.html

 

下面是介绍的全文

Published online: 6 August 2008 | :10.1038/nchina.2008.181:10.1038/nchina.2008.181

 

Optical devices: Window replacement

Felix Cheung

 

A narrow window filled with cleverly engineered materials can let light into the room in the same way as a wide window

Original article citation

Zhang, X., Chen, H., Luo, X. & Ma, H. Transformation media that turn a narrow slit into a large window. Opt. Express 16, 11764–11768 (2008).
Optical devicesWindow replacement

© (2008) OSA

The development of metamaterials — artificially engineered composites that can bend visible light or other forms of electromagnetic radiation in unusual ways — has brought forth the possibility of novel optical devices, such as invisibility cloaks, wave concentrators, and wave polarization rotators. Xudong Luo and co-workers at Shanghai Jiao Tong University1 have proposed another use for metamaterials — turning narrow windows into wide windows.

The researchers simulated numerically the way light is transmitted in two circumstances: light passing through a wide opening formed between two rectangular obstacles (see top image); and light passing through a narrow slit formed between two trapezoidal obstacles (see bottom image). They showed that if the region between the trapezoidal obstacles has the right permittivity and permeability, the narrow slit can transmit light in the same way and form the same diffraction pattern as the wide opening.

One way to achieve this would be to fill the narrow slit with metamaterials. The concept is in the same spirit as cloaking, where light is bent in such a way that it propagates just as it would if the metamaterial object were not there. The proposed idea is promising because it does not require extreme values of permittivity or permeability. Also, by using this idea, wide windows in buildings or devices can be replaced by narrow slits for improved stability.

The authors of this work are from:
Department of Physics, Shanghai Jiao Tong University, Shanghai, China.

Reference

  1. Zhang, X., Chen, H., Luo, X. & Ma, H. Transformation media that turn a narrow slit into a large window. Opt. Express 16, 11764–11768 (2008). | Article |

 



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