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Shifting: shapes of light in the fundamental mode (above) and higher order mode (below).
Left: The shape of light in the fundamental mode (top) versus a higher order mode (bottom) is shown as a diagram (color, left) and in the experiment (black and white, right). Right: Because of the change in energy distribution, the evanescent field from the higher order mode (red line) extends farther outside the microfiber (grey area) than from the fundamental mode (black line). Photo credit: OIST.
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