手机APP下载

您现在的位置: 首页 > 英语听力 > 国外媒体资讯 > 经济学人双语版 > 经济学人科技系列 > 正文

经济学人:光的种子(1)

来源:经济学人 编辑:Ceciliya   VIP免费外教试听课 |  可可官方微信:ikekenet
 下载MP3到电脑  批量下载MP3和LRC到手机
加载中..

"Lens" is the Latin word for lentil. And it is indeed true that the shape of biconvex lenses—

“Lens”是拉丁词小扁豆的意思。双凸透镜的形状确实如此—
the familiar sort used as magnifying glasses—resembles those leguminous seeds.
放大镜常用的一种镜片—它们和那些豆科种子很相似。
But that resemblance may soon be a thing of the past.
但这种相似性可能很快就会成为过去。
For a group of engineers at Columbia University, in New York, led by Nanfang Yu,
因为纽约哥伦比亚大学一支由虞南方带领的团队
has worked out how to make magnifying lenses that are flat, and thinner than a hair.
发明了一种平的、比头发还细的放大透镜。
A lens works by slowing down a light wave as it traverses one of the lens's faces
这种透镜的工作原理是当光波穿过透镜的一面时,使其速度慢下来
(the speed of light in glass is about two-thirds of that in air).
(玻璃中的光速大约是空气中的三分之二)。
Slowing a wave changes its direction, a process called refraction.
放慢光波改变了其方向,这个过程被称为折射。
The angle through which it is refracted depends on its angle of incidence to the refracting surface—
它被折射的角度取决于它与折射表面的入射角—
an angle that, on a curved surface, varies continuously. When the light leaves the lens it picks up speed again,
这是一种在曲面上连续变化的角。当光离开透镜时,它又加快速度,

光的种子(1).png

and thus goes through a second refraction. The trick of the lensmaker's art is to grind the two surfaces into such shapes

然后经过第二次折射。制镜师的技巧是把两个表面磨成这样的形状,
that the sum of all this refraction brings the light passing through the lens to a focus.
让所有这些折射的总和带着穿过透镜的光线聚焦在一起。
Dr Yu's flat lens achieves a similar result in a different way.
虞博士的平面透镜以一种不同的方式获得了类似的结果。
Instead of holding the change of speed constant while varying the angle of incidence,
新透镜没有在改变入射角的同时保持速率常数不变
the new lens holds the angle of incidence constant while varying the amount that the speed changes on different parts of the lens.
而是在改变透镜不同部位的速度变化量的同时,保持入射角常数。
It can do this because its surface is covered with millions of tiny antennae.
透镜能做到这一点是因为它的表面覆盖着数百万个微小的天线。
These antennae are of different designs, each with a cross section smaller than the average wavelength of the light it is interacting with,
这些天线的设计各不相同,每一个的横截面都一个小于与之相互作用的光的平均波长,
and are arranged in concentric circles. The antennae scatter the light falling on them in such a way that,
并且呈同心圆排列。天线将落在自己身上的光散开,
when the individual changes are added up,
当个体变化叠加时,
the combined effect is the same as if different parts of the beam had passed through the lens at different speeds.
这种组合效果就像光线的不同部分以不同的速度穿过透镜一样。
Dr Yu is not the first person to make a lens in this way, but previous efforts worked only with single colours,
虞博士不是用这种方式制作透镜的第一人,但之前的努力只适用于单一颜色,
and also required the light to be polarised. Dr Yu's lens works with all colours and in natural light, which is unpolarised.
并且还需要对光线进行极化。虞博士的透镜适用于所有颜色并在在没有极化的自然光线也能工作。

译文由可可原创,仅供学习交流使用,未经许可请勿转载。

重点单词   查看全部解释    
scatter ['skætə]

想一想再看

n. 散布,零星少量
vt. 驱散,散播

 
incidence ['insidəns]

想一想再看

n. 发生(率), 入射

联想记忆
lens [lenz]

想一想再看

n. 镜头,透镜,(眼球的)水晶体
vt

 
constant ['kɔnstənt]

想一想再看

adj. 经常的,不变的
n. 常数,恒量

联想记忆
wavelength ['weiv.leŋθ]

想一想再看

n. 波长,波段

联想记忆
resemblance [ri'zembləns]

想一想再看

n. 相像,相似

联想记忆
grind [graind]

想一想再看

vt. 磨,碾碎,挤压,压迫
vi. 磨得吱吱

 
resemble [ri'zembl]

想一想再看

vt. 相似,类似,像

联想记忆
antennae [æn'teni:]

想一想再看

n. 天线(等于aerial);[动]触须;[植]蕊喙;

 
curved

想一想再看

adj. 弯曲的;弄弯的 n. 倒弧角 vt. 弯曲(c

 

发布评论我来说2句

    英语学习专题

    • 英语听写训练
      听写强化训练系统有听写比对,按句停顿,中文翻译、听写错词提示等特色功能.
    • 经济学人中英双语版
      提供经济学人中英双语版文章、音频、中英字幕,类别包括文艺、人物、科技、商业等..
    • 可可英语微信:ikekenet
      关注可可英语官方微信,每天将会向大家推送短小精悍的英语学习资料..

    可可英语官方微信(微信号:ikekenet)

    每天向大家推送短小精悍的英语学习资料.

    添加方式1.扫描上方可可官方微信二维码。
    添加方式2.搜索微信号ikekenet添加即可。