Riding herd on photons: New 'metamaterial' prevents electromagnetic waves from reflecting backward

Computer chips that use light to move data would be much more energy efficient and possibly even faster than today’s chips, which use electricity. One of the difficulties in realizing them, however, is that light moving through a “waveguide” — unlike electrons moving through a wire — can reflect backward, interfering with subsequent transmissions and even disrupting the operation of the laser that emitted it.

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