A New Angle on Light Control

SHANNON PALUS

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A New Angle on Light Control

机译：灯光控制的新角度

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Humans know how to filter light: Stained glass only allows through light of a certain color, and polarized sunglasses block certain light waves. But filtering light based on the direction it's traveling has eluded scientists for decades. But now, scientists at MIT devised a tiny block that can do just that. It's smaller than a stick of gum and made of 84 thin, alternating layers of glass and tantalum oxide (a compound often found in electronics). Viewed from most angles, the block reflects light like a mirror. At exactly 55 degrees from vertical (35 degrees from the block itself), however, it appears transparent, totally clear. That's because each of the 83 interfaces between the two materials filters some of the incoming light; only the light traveling at the correct angle makes it through the block (rendering it transparent). The rest bounces back as a reflection.

机译：人类知道如何过滤光：彩色玻璃仅允许某种颜色的光通过，而偏光太阳镜则阻挡某些光波。但是数十年来，科学家一直无法根据行进方向过滤光。但是现在，麻省理工学院的科学家设计了一个可以做到这一点的小模块。它比口香糖棒小，由84层交替的玻璃和氧化钽（通常在电子产品中发现）组成。从大多数角度看，该块都像镜子一样反射光。但是，它与垂直线成正好55度（与块本身成35度），看起来是透明的，完全清晰。这是因为两种材料之间的83个界面中的每一个都过滤掉了一些入射光。只有以正确角度传播的光线才能通过该块（使其透明）。其余的反弹回来作为反思。

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《Discover》 |2015年第1期|53-53|共1页
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SHANNON PALUS;
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2. Dragonfly flight: free-flight and tethered flow visualizations reveal a diverse array of unsteady lift-generating mechanisms, controlled primarily via angle of attack [J] . Thomas AL, Taylor GK, Srygley RB, The Journal of Experimental Biology . 2004,第Pta24期

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7. Controlling Transmittance of Visible Light by the Incident Light Angle Using Needle-like TiO2 Particle Arrayed Composite Films [O] . Toshitaka Ota, Hisao Suzuki, Shin-ichi Kikitsu, 2012

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8. Flight test of the X-29A at high angle of attack: Flight dynamics and controls [R] . Bauer, Jeffrey E., Clarke, Robert, Burken, John J. 1995

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A New Angle on Light Control

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