Advancer的博客

  To make light go backward, hold up a mirror. Light bounces off the mirror and goes back.
  Robert W. Boyd, a professor of optics at the University of Rochester, however, did not choose this easy, straightforward technique.
  Instead, in the latest example of logic-defying tricks that physicists can now perform with light, Dr. Boyd and his colleagues demonstrated an optical fiber — a glass strand that transmits pulses of light — with a couple of odd characteristics:
1、A pulse of light shot into the fiber departs before it enters.

2、Within the fiber, the pulse travels backward — and faster than the speed of light.
  Perhaps most amazingly, Dr. Boyd's results do not violate any law of physics. The effect is indeed predicted by the equations describing the propagation of waves.
  In the vacuum of space, light travels at a constant 186,171 miles per second. When it passes through a transparent material like glass or water, it slows slightly, in effect bouncing off atoms as it moves.
hold up举起               bounce off从...弹回
straightforward直接的     logic-defy反逻辑
colleague同事            demonstrate证明，论证
optical光学的             fiber纤维
strand纤维                transmit传输
pulse脉冲                 odd奇特的
characteristics特性，特点  depart离开
amazingly令人惊讶地        violate违反
law法则，定律              equation方程式
propagation传播           vacuum真空
constant常数，常量     transparent透明的，明显的
material材料              slightly轻微地
in effect实际上           atom原子