Matt Eichenfield's team at Sandia National Laboratories uses multiple microwave frequencies to characterize a nonlinear phononic mixing device they built on a silicon wafer. Credit: Bret Latter/Sandia National Laboratories What if your earbuds could do everything your smartphone can do already, except better? What sounds a bit like science fiction may actually not be so far off. A new class of synthetic materials could herald the next revolution of wireless technologies, enabling devices to be s...