Slow and Fast Light Enhanced Light Drag in a Moving Microcavity
Slow and fast light enhanced light drag in a moving microcavity Tian Qin,1 Jianfan Yang,1 Fangxing Zhang,1 Yao Chen,1 Dongyi Shen,2 Wei Liu,2 Lei Chen,2 Yuanlin Zheng,2, 3 Xianfeng Chen,2 and Wenjie Wan1, 2, ∗ 1The State Key Laboratory of Advanced Optical Communication Systems and Networks, University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China 2MOE Key Laboratory for Laser Plasmas and Collaborative Innovation Center of IFSA, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China 3Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA (Dated: May 21, 2019) Fizeau experiment, inspiring Einsteins special theory of relativity, reveals a small dragging effect of light inside a moving medium. Dispersion can enhance such light drag according to Lorentzs predication. Here we experimentally demonstrate slow and fast light enhanced light drag in a moving optical microcavity through stimulated Brillouin scattering induced transparency and absorption. The strong dispersion provides an enhancement factor up to ∼ 104 , greatly reducing the system size down to the micrometer range. These results may offer a unique platform for a compact, integrated solution to motion sensing and ultrafast signal processing applications. I. INTRODUCTION (EIT) medium of strong normal dispersion to enhance the dragging effect has been realized both in hot atomic It is well-known that the speed of light in a vacuum vapors [8, 9] as well as cold atoms [10]. However, the rigid is the same regardless of the choice of reference frame, experimental conditions requiring vacuum and precise according Einsteins theory of special relativity [1].
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