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Frequency conversion through time refraction using an epsilon-near-zero material

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Abstract

We report a large and tunable frequency shifting over 14.8 THz bandwidth of an infrared probe beam through time refraction in indium tin oxide (ITO) in its epsilon-near-zero region. The sign of the frequency change can be controlled by adjusting the delay between a pump and the probe.

© 2019 The Author(s)

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