实验室长度尺度上地球引力对超慢光的偏转
Deflection of Ultra Slow Light by Earth Gravity on Laboratory Length Scale
摘要：
光在真空中的高速和地球引力的微弱，排除了任何在实验室长度尺度上对光的引力偏转的实验检测。然而，相干光学的最新进展，在高色散介质中产生群速度低至~102 ms-1甚至更低的超慢光，开辟了这种可能性。在这项工作中，我们提出了一个可能的实验室观测的偏转这样一个超慢光在地球重力下的高色散介质的理论研究。我们的广义相对论计算是基于修改后的戈登光学度规，以便包括色散。对于0.1 m的水平移动，计算出的线性垂直偏转为~0.1 mm，并且组速度vg为~ 102 ms-1。实验的可实现性和一些概念点将简要讨论。
英文摘要：
The high speed of light in vacuo together with the weakness of Earth gravity rules out any experimental detection of gravitational deflection of light on the laboratory length scale. Recent advances in coherent optics that produce ultra slow light in highly dispersive media with the group velocities down to ~102 ms-1, or even less, however, open up this possibility. In this work, we present a theoretical study for a possible laboratory observation of the deflection of such an ultra slow light in the highly dispersive medium under Earth gravity. Our general relativistic calculation is based on the Gordon optical metric modified so as to include dispersion. The calculated linear vertical deflection turns out to be ~0.1 mm for a horizontal traversal of 0.1 m, and a group speed vg ~ 102 ms-1. Experimental realizability and some conceptual points involved will be briefly discussed.
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