Affiliation:
1. University of Rochester
Abstract
Light propagating in a moving medium is subject to light drag. While
the light drag effect due to the linear refractive index is often
negligibly small, the light drag can be enhanced in materials with a
large group index. Here we show that the nonlinear refractive index
can also play a crucial role in the propagation of light in moving
media and results in a beam deflection. We perform an experiment with
a rotating ruby crystal that exhibits a very large negative group
index and a positive nonlinear refractive index. The negative group
index drags the light opposite to the motion of the medium. However,
the positive nonlinear refractive index deflects the beam along with
the motion of the medium and hinders the observation of the negative
drag effect. Hence, we show that it is necessary to measure not only
the transverse shift of the beam but also its output angle to
discriminate the light drag effect from beam deflection. Our work
provides insight into applications for all-optical control of light
trajectories, particularly for beam steering, mode sorting, and
velocimetry.
Funder
Natural Sciences and Engineering Research
Council of Canada
Canada Research Chairs
Canada First Research Excellence
Fund
Office of Naval Research
North Shore Micmac District
Council’s (NSMDC) Post-Secondary Education
Program
Multidisciplinary University Research
Initiative
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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